610 Medizin und Gesundheit
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Osteonecrosis (ON) is an acquired debilitating skeletal disorder, which is caused by a multitude of traumatic and non-traumatic etiological factors. Vascular damage, mechanical stress and increased intraosseous pressure have been discussed as contributors to ON. The optimal treatment of ON remains to be determined, since the current gold standard, core decompression, is insufficiently effective. Specific properties of mesenchymal stromal cells (MSCs) provide the rationale for their assessment in advanced stages of ON: Osteoinductive potential has been demonstrated and MSC preparations of suitable quality for use as medicinal products have been developed. Here we review the scant information on the use of allogeneic or autologous MSCs in advanced ON as well as potentially supportive data from pre-clinical studies with autologous bone marrow mononuclear cells (auto BM-MNCs), which have been studied quite extensively and the presumed therapeutic effect of which was attributed to the rare MSCs contained in these cell products. Outcomes in clinical trials with MSCs and auto-BM-MNCs remain preliminary and non-definitive, at best promising, with respect to their pharmacological effect. Clearly, though, the application of any of these cell therapies was technically feasible and safe in that it was associated with low complication rates. The heterogeneity of cell type and source, study protocols, cell manufacturing, cell properties, cell doses and surgical techniques might contribute to inconsistent results.
In Eurotransplant kidney allocation system (ETKAS), candidates can be considered unlimitedly for repeated re‐transplantation. Data on outcome and benefit are indeterminate. We performed a retrospective 15‐year patient and graft outcome data analysis from 1464 recipients of a third or fourth or higher sequential deceased donor renal transplantation (DDRT) from 42 transplant centers. Repeated re‐DDRT recipients were younger (mean 43.0 vs. 50.2 years) compared to first DDRT recipients. They received grafts with more favorable HLA matches (89.0% vs. 84.5%) but thereby no statistically significant improvement of patient and graft outcome was found as comparatively demonstrated in 1st DDRT. In the multivariate modeling accounting for confounding factors, mortality and graft loss after 3rd and ≥4th DDRT (P < 0.001 each) and death with functioning graft (DwFG) after 3rd DDRT (P = 0.001) were higher as compared to 1st DDRT. The incidence of primary nonfunction (PNF) was also significantly higher in re‐DDRT (12.7%) than in 1st DDRT (7.1%; P < 0.001). Facing organ shortage, increasing waiting time, and considerable mortality on dialysis, we question the current policy of repeated re‐DDRT. The data from this survey propose better HLA matching in first DDRT and second DDRT and careful selection of candidates, especially for ≥4th DDRT.
Confinement measures during the COVID-19 pandemic have caused substantial reductions in global physical activity (PA) levels. In view of the manifold health benefits of PA, the development of interventions counteracting this trend is paramount. Our survey with 15,261 participants (38 ± 15 years, 58.5% females) examined preferences towards digital home exercise programs in 14 countries affected by COVID-19. More than two-thirds of the sample (68.4%, n = 10,433) indicated being interested in home exercise, and most participants were willing to work out at least three times per week (89.3%, n = 9328). Binary logistic regression revealed that female sex, working part-time, younger age, and being registered in a gym were associated with willingness to exercise. Flexibility (71.1%, n = 7377), resistance (68.6%, n = 7116), and endurance training (62.4%, n = 6478) were the most preferred types of exercise. Our results may guide health providers in developing individually tailored PA interventions during the current and future pandemics.
Prior studies indicate the protective role of Ultraviolet-B (UVB) radiation in human health, mediated by vitamin D synthesis. In this observational study, we empirically outline a negative association of UVB radiation as measured by ultraviolet index (UVI) with the number of COVID-19 deaths. We apply a fixed-effect log-linear regression model to a panel dataset of 152 countries over 108 days (n = 6524). We use the cumulative number of COVID-19 deaths and case-fatality rate (CFR) as the main dependent variables and isolate the UVI effect from potential confounding factors. After controlling for time-constant and time-varying factors, we find that a permanent unit increase in UVI is associated with a 1.2 percentage points decline in daily growth rates of cumulative COVID-19 deaths [p < 0.01] and a 1.0 percentage points decline in the CFR daily growth rate [p < 0.05]. These results represent a significant percentage reduction in terms of daily growth rates of cumulative COVID-19 deaths (− 12%) and CFR (− 38%). We find a significant negative association between UVI and COVID-19 deaths, indicating evidence of the protective role of UVB in mitigating COVID-19 deaths. If confirmed via clinical studies, then the possibility of mitigating COVID-19 deaths via sensible sunlight exposure or vitamin D intervention would be very attractive.
Risk stratification for bipolar disorder using polygenic risk scores among young high-risk adults
(2020)
Objective: Identifying high-risk groups with an increased genetic liability for bipolar disorder (BD) will provide insights into the etiology of BD and contribute to early detection of BD. We used the BD polygenic risk score (PRS) derived from BD genome-wide association studies (GWAS) to explore how such genetic risk manifests in young, high-risk adults. We postulated that BD-PRS would be associated with risk factors for BD.
Methods: A final sample of 185 young, high-risk German adults (aged 18–35 years) were grouped into three risk groups and compared to a healthy control group (n = 1,100). The risk groups comprised 117 cases with attention deficit hyperactivity disorder (ADHD), 45 with major depressive disorder (MDD), and 23 help-seeking adults with early recognition symptoms [ER: positive family history for BD, (sub)threshold affective symptomatology and/or mood swings, sleeping disorder]. BD-PRS was computed for each participant. Logistic regression models (controlling for sex, age, and the first five ancestry principal components) were used to assess associations of BD-PRS and the high-risk phenotypes.
Results: We observed an association between BD-PRS and combined risk group status (OR = 1.48, p < 0.001), ADHD diagnosis (OR = 1.32, p = 0.009), MDD diagnosis (OR = 1.96, p < 0.001), and ER group status (OR = 1.7, p = 0.025; not significant after correction for multiple testing) compared to healthy controls.
Conclusions: In the present study, increased genetic risk for BD was a significant predictor for MDD and ADHD status, but not for ER. These findings support an underlying shared risk for both MDD and BD as well as ADHD and BD. Improving our understanding of the underlying genetic architecture of these phenotypes may aid in early identification and risk stratification.
Background & Aims: Acute‐on‐chronic liver failure (ACLF) is characterized by high short‐term mortality and systemic inflammation (SI). Recently, different cardiodynamic states were shown to independently predict outcomes in cirrhosis. The relationship between cardiodynamic states, SI, and portal hypertension and their impact on ACLF development remains unclear. The aim of this study was therefore to evaluate the interplay of cardiodynamic state and SI on fatal ACLF development in cirrhosis.
Results: At inclusion, hemodynamic measures including cardiac index (CI) and hepatic venous pressure gradient of 208 patients were measured. Patients were followed prospectively for fatal ACLF development (primary endpoint). SI was assessed by proinflammatory markers such as interleukins (ILs) 6 and 8 and soluble IL‐33 receptor (sIL‐33R). Patients were divided according to CI (<3.2; 3.2‐4.2; >4.2 L/min/m2) in hypo‐ (n = 84), normo‐ (n = 69) and hyperdynamic group (n = 55). After a median follow‐up of 3 years, the highest risk of fatal ACLF was seen in hyperdynamic (35%) and hypodynamic patients (25%) compared with normodynamic (14%) (P = .011). Hyperdynamic patients showed the highest rate of SI. The detectable level of IL‐6 was an independent predictor of fatal ACLF development.
Conclusions: Cirrhotic patients with hyperdynamic and hypodynamic circulation have a higher risk of fatal ACLF. Therefore, the cardiodynamic state is strongly associated with SI, which is an independent predictor of development of fatal ACLF.
In dieser Studie haben wir die Modulation von Arachidonsäure (AA)-Stoffwechselwegen während einer Wurminfektionen mit dem Fadenwurm Heligmosomoides polygyrus bakeri (Hpb) als angeborene regulatorische Strategie zur Modulation der Typ-2-Entzündung untersucht. Wir zeigten, dass Hpb in frühen Stadien der Infektion (Tag 7) die Produktion von regulatorischen Prostaglandinen (PGE2 und 6-keto PGF1-α, ein Abbauprodukt von PGI2) und COX-Metaboliten (12-HHT und TXB2) fördert, jedoch die Sekretion von entzündungsfördernden Mediatoren PGD2 und LTs (LTB4, cysLTs) unterdrückt. Die Hpb-gesteuerte Regulierung des AA-Stoffwechsels könnte eine Strategie zur Immunsuppression/ Immunevasion dieses Parasiten darstellen, die darauf abzielt, die vom Wirt ausgelösten Immunantworten des Typs-2 zu unterbinden und sowohl die Infiltration und Rekrutierung von Granulozyten als auch die Schleimproduktion zu begrenzen und auf diese Weise das Abtöten bzw. Ausscheiden der Larven zu verhindern.
Als Schwerpunkt der Arbeit, konnten wir ebenso zeigen, dass ein Larvenextrakt aus Heligmosomoides polygyrus bakeri (HpbE) den AA Stoffwechsel in myeloiden Zellen wie Makrophagen und Granulozyten moduliert, indem die Synthese von 5-LOX in Richtung COX-Metaboliten verschoben wird. Die Behandlung von murinen und humanen Makrophagen mit HpbE induzierte die Synthese von regulatorischen Prostaglandinen (PGE2) und Prostaglandinen, die an der Wundheilung und Blutgerinnung beteiligt sind (12-HHT, TXB2), wohingegen die Produktion von entzündungsfördernden Lipidmediatoren (LTs, PGD2) unterdrückt wurde. Weiter induzierte HpbE in humanen und murinen Makrophagen die Synthese der Typ-2 hemmenden Mediatoren IL-10 und IL-1β und modulierte die Produktion von Zytokinen, die an der Regulierung von M2-Polarisierung und der Typ-2-Entzündung (IL-12, IL-28, IL-27 und TNF-α) in humanen Makrophagen beteiligt sind. Ähnlich zu der HpbE-vermittelten Eicosanoid-Umprogrammierung in Makrophagen, veränderte HpbE den AA-Stoffwechsel humaner Granulozyten und zeigt eine Verschiebung von LOX- in Richtung COX-Metabolismus. Außerdem kann HpbE direkt auf humane Granulozyten wirken und die Chemotaxis von Granulozyten effizienter hemmen als zur Asthmabehandlung verwendete Standardarzneimittel, indem es die Expression von LT synthetisierenden Enzymen (LTA4H und LTC4S) verringert und die Expression von chemotaktischen Rezeptoren (CCR3 und CRTH2) herunterreguliert.
Darüber hinaus, konnten wir die Mechanismen identifizieren, die der HpbE-gesteuerten Eicosanoid-Umprogrammierung in Makrophagen zugrunde liegen. Hpb Produkte induzierten die Aktivierung von p38 MAPK, welche COX und die Transkriptionsfaktoren HIF-1α und NFκβ aktiviert und die Produktion von Prostaglandinen (PGE2 and TXB2) sowie der Typ-2 unterdrückenden Zytokine IL-10 and IL-1β fördert. Der der Induktion des COX-Signalwegs zugrunde liegende Upstream-Mechanismus umfasste mehrere PPRs (TLR2, Dectin-1/2). Diese Rezeptoren waren allerdings nicht an der HpbE-gesteuerten Induktion von IL-10 beteiligt. Die Mechanismen der Modulation des 5-LOX-Signalweges muss noch in zukünftigen Studien weiter erforscht werden.
Das therapeutische Potential von HpbE oder HpbE-behandelten Makrophagen wurde in einem Maus Model mit HDM-induzierter allergischer Atemwegsentzündung in vivo gezeigt. Eine intranasale Behandlung mit HpbE vor HDM-Sensibilisierung und -Provokation führte zu einer Umprogrammierung des AA-Stoffwechsels und verhinderte die Allergie-induzierte Eosinophilie, Zellinfiltration, Atemwegsentzündung und Schleimproduktion. Die Modulation der Typ-2-Entzündung durch HpbE wurde vor allem durch COX-2-Metabolite vermittelt, die von HpbE-stimulierten Makrophagen freigesetzt wurden. Dies zeigte sich insbesondere darin, dass der Transfer von HpbE-stimulierten Wildtyp- aber nicht COX-2-defizienten Makrophagen vor Provokation die Granulozyten Rekrutierung und Typ-2-Entzündung während der HDM-induzierten Allergie in vivo abschwächte.
Mittels eines Maus Models für die allergische Atemwegsentzündung in unterschiedlichen Altersstufen (Neugeboren, Jungtier und Erwachsen) zeigte dieses Forschungsprojekt, dass das Alter der Sensibilisierung eine Schlüsselrolle bei der Produktion von LTs, der Expression von LT-Synthese Enzymen sowie von Faktoren, die zu strukturellen Veränderungen in den Atemwegen führen, spielt. Hier haben wir auch festgestellt, dass der Mechanismus hinter der LT-Produktion und dem Atemwegs-Remodeling im Epithel von ausgewachsenen sensibilisierten Mäusen die Aktivierung der Faktoren sPLA2X, TGM2 und Wnt5a beinhaltet.
Des Weiteren zeigte unsere Studie, dass eine Wechselwirkung zwischen entzündetem Atemwegsepithel und Alveolar-ähnlichen Makrophagen die Synthese von LTs fördern kann. Der vorgeschlagene Mechanismus startet mit der Sekretion von Wnt5a durch das entzündete Atemwegsepithel, welches die Expression von TGM2 in Makrophagen aktiviert und die Produktion von entzündungsfördernden LTs induziert, wodurch die Rolle der Makrophagen in entzündeten Atemwegen bei Erwachsenen weiter unterstützt wird. Die Relevanz der entdeckten Kaskade konnte auch in Geweben von Patienten mit chronischer Rhinosinusitis und Nasenpolypen (CRSwNP) bestätigt werden. Hohe Konzentrationen von LT Enzymen (5-LO, LTC4S LTA4H), sPLA2-X, TGM2 und Wnt5a wurden in humanen Nasenpolyp Geweben beobachtet, und hohe Konzentrationen von CysLTs wurden in Nasenpolyp Sekreten dieser Patienten gemessen. Dies lässt vermuten, dass die Expression von Atemwegs Remodeling-Faktoren, LT-Synthese Enzymen und die LT Synthese steroidresistent sind. Daher könnte diese entzündliche Kaskade ein alternatives therapeutisches Ziel für die Behandlung von Asthma darstellen, speziell bei Patienten mit steroidresistenten Formen von Atemwegsentzündungen.
Basierend auf den möglichen therapeutischen Anwendungen von HpbE haben wir begonnen, an der Charakterisierung der im HpbE vorhandenen immunmodulatorischen Wirkstoffe zu arbeiten. Glutamatdehydrogenase (GDH) und Ferritin wurden als potenzielle immunmodulatorische Komponenten von HpbE identifiziert. Es ist jedoch weitere Arbeit erforderlich, um diese in HpbE vorhandenen Proteine rekombinant herzustellen und den Wirkungsmechanismus im Bezug auf die Typ-2-Entzündung weiter aufzuklären.
Background: Blunt chest (thoracic) trauma (TxT) and haemorrhagic shock with subsequent resuscitation (H/R) induce strong systemic and local inflammatory response, which is closely associated with apoptotic cell loss and subsequently impaired organ function. The underlying mechanisms are not completely understood, therefore, the treatment of patients suffering from TxT+H/R is challenging. In our recent studies, we have demonstrated local anti-inflammatory effects of ethyl pyruvate (EtP) in lung and liver after TxT+H/R. Here, the therapeutic potential of a reperfusion regime with EtP on the early post-traumatic systemic inflammatory response and apoptotic changes after TxT followed by H/R were investigated.
Methods: Female Lewis rats underwent TxT followed by haemorrhagic shock (60 min). Resuscitation was performed with own blood transfusion and either lactated Ringers solution (LR) or LR supplemented with EtP (50 mg/kg). Sham group underwent the surgical procedures. After 2 h blood as well as lung and liver tissues were obtained for analyses. Systemic activation of neutrophils (expression of CD11b and CD62L), leukocyte phagocytosis, apoptosis (caspase-3/7 activation), pyroptosis (caspase-1 activation) and NF-κB p65 activity were assessed. p < 0.05 was considered significant.
Results: TxT+H/R-induced systemic activation of neutrophils (increased CD11b and reduced CD62L expression) was significantly reduced by EtP. Trauma-induced delayed neutrophil apoptosis was further reduced by EtP reperfusion but remained unaltered in monocytes. Reperfusion with EtP significantly increased the phagocytizing capacity of granulocytes. Trauma-induced inflammasome activation, which was observed in monocytes and not in neutrophils, was significantly reduced by EtP in both cell entities. NF-κB p65 activation, which was increased in neutrophils and monocytes was significantly decreased in monocytes.
Conclusion: TxT+H/R-induced systemic activation of both neutrophils and monocytes concomitant with increased systemic inflammation was reduced by a reperfusion with EtP and was associated with a down-regulation of NF-κB p65 activation.
Background: Lung disease phenotype varies widely even in the F508del (homozygous) genotype. Leukocyte-driven inflammation is important for pulmonary disease pathogenesis in cystic fibrosis (CF). Blood cytokines correlate negatively with pulmonary function in F508del homozygous patients, and gap junction proteins (GJA) might be related to the influx of blood cells into the lung and influence disease course. We aimed to assess the relationship between GJA1/GJA4 genotypes and the clinical disease phenotype. Methods: One-hundred-and-sixteen homozygous F508del patients (mean age 27 years, m/f 66/50) were recruited from the CF centers of Bonn, Frankfurt, and Amsterdam. Sequence analysis was performed for GJA1 and GJA4. The clinical disease course was assessed over 3 years using pulmonary function tests, body mass index, Pseudomonas aeruginosa colonization, diabetes mellitus, survival to end-stage lung disease, blood and sputum inflammatory markers. Results: Sequence analysis revealed one clinically relevant single nucleotide polymorphism. In this GJA4 variant (rs41266431), homozygous G variant carriers (n = 84/116; 72.4%) had poorer pulmonary function (FVC% pred: mean 78/86, p < 0.040) and survival to end-stage lung disease was lower (p < 0.029). The frequency of P. aeruginosa colonization was not influenced by the genotype, but in those chronically colonized, those with the G/G genotype had reduced pulmonary function (FVC% pred: mean 67/80, p < 0.049). Serum interleukin-8 (median: 12.4/6.7 pg/ml, p < 0.052) and sputum leukocytes (2305/437.5 pg/ml, p < 0.025) were higher for the G/G genotype. Conclusions: In carriers of the A allele (27.6%) the GJA4 variant is associated with significantly better protection against end-stage lung disease and superior pulmonary function test results in F508del homozygous patients. This SNP has the potential of a modifier gene for phenotyping severity of CF lung disease, in addition to the CFTR genotype.
Clinical Trial Registration: The study was registered with ClinicalTrials.gov, number NCT04242420, retrospectively on January 24th, 2020.
The sphingolipid sphingosine‐1‐phosphate (S1P) fulfills distinct functions in immune cell biology via binding to five G protein‐coupled receptors. The immune cell‐specific sphingosine‐1‐phosphate receptor 4 (S1pr4) was connected to the generation of IL‐17‐producing T cells through regulation of cytokine production in innate immune cells. Therefore, we explored whether S1pr4 affected imiquimod‐induced murine psoriasis via regulation of IL‐17 production. We did not observe altered IL‐17 production, although psoriasis severity was reduced in S1pr4‐deficient mice. Instead, ablation of S1pr4 attenuated the production of CCL2, IL‐6, and CXCL1 and subsequently reduced the number of infiltrating monocytes and granulocytes. A connection between S1pr4, CCL2, and Mϕ infiltration was also observed in Zymosan‐A induced peritonitis. Boyden chamber migration assays functionally linked reduced CCL2 production in murine skin and attenuated monocyte migration when S1pr4 was lacking. Mechanistically, S1pr4 signaling synergized with TLR signaling in resident Mϕs to produce CCL2, likely via the NF‐κB pathway. We propose that S1pr4 activation enhances TLR response of resident Mϕs to increase CCL2 production, which attracts further Mϕs. Thus, S1pr4 may be a target to reduce perpetuating inflammatory responses.
Aim: Pharmacoresistance is a major burden in epilepsy treatment. We aimed to identify genetic biomarkers in response to specific antiepileptic drugs (AEDs) in genetic generalized epilepsies (GGE). Materials & methods: We conducted a genome-wide association study (GWAS) of 3.3 million autosomal SNPs in 893 European subjects with GGE – responsive or nonresponsive to lamotrigine, levetiracetam and valproic acid. Results: Our GWAS of AED response revealed suggestive evidence for association at 29 genomic loci (p <10-5) but no significant association reflecting its limited power. The suggestive associations highlight candidate genes that are implicated in epileptogenesis and neurodevelopment. Conclusion: This first GWAS of AED response in GGE provides a comprehensive reference of SNP associations for hypothesis-driven candidate gene analyses in upcoming pharmacogenetic studies.
Einleitung: Die akute Tonsillitis gehört zu den Infektionen der oberen Atemwege und ist eine sehr häufige Erkrankung in einer Kinder- und Jugendarztpraxis. Ziel unserer Untersuchung war es, das virale und bakterielle Erregerspektrum der akuten Tonsillitis, ihre saisonale Verteilung, ihre Altersverteilung, die klinische Symptomatik und den Einfluss einer Rauchexposition zu untersuchen. Gleichzeitig sollte erneut die Sensitivität und Spezifität des angewandten StrepA ST überprüft werden.
Methoden: In drei Kinder- und Jugendarztpraxen im Rhein-Main Gebiet wurden zwischen April 2009 und Mai 2010 insgesamt 1720 Patienten mit akuten Halsschmerzen untersucht. Mit einem Anamnesebogen wurden Alter, klinische Symptomatik und die Rauchexposition erfasst. Bei allen Patienten wurde ein StrepA ST durchgeführt. In einer Praxis (Praxis 1) wurden bei 306 Patienten zusätzlich ein Abstrich für eine bakterielle Kultur und für eine Multiplex PCR auf Viren durchgeführt.
Resultate: In 84% der Fälle tritt die GAS Tonsillitis im Alter zwischen 2 und 12 Jahren auf. Es konnte keine saisonale Häufung der GAS nachgewiesen werden. Mit 64 (42%) StrepA ST positiven Patienten von 152 Raucher-Familien und 74 (37%) von 200 Nichtraucher-Raucher-Familien zeigt sich kein signifikant erhöhtes Risiko an einer GAS Tonsillitis zu erkranken, wenn mindestens ein Elternteil raucht. Bei 306 Rachenabstrichen konnten 145 (47,5%) mal Streptokokken nachgewiesen werden. Davon waren mit 133 vorwiegend GAS (92%). Die anderen Streptokokken der Gruppen C (4,8%), G (2,1%) und B (1,4%) kommen deutlich seltener vor und spielen eine untergeordnete Rolle. Die Sensitivität und Spezifität des StrepA ST war mit 89,9% und 94,1% ausgezeichnet. Bei 306 Tonsillitiden gelang bei 110 Patienten (35,8%) ein Virusnachweis. Wie erwartet fanden sich doppelt so viele Virusnachweise (46%) bei Patienten ohne GAS Nachweis als Ko-Infektionen bei einer GAS (24%). Der Anteil der Entero-/Rhinoviren unter den nachgewiesenen Viren war mit 54% am höchsten. Adenoviren waren mit 15% und Influenza- 9% die nächst häufigen Viren, Para- und Coronaviren bildeten kleinere Gruppen. Während Entero-/Rhinoviren ganzjährig vorkommen sind Influenzaviren eher in der kalten Jahreszeit für akute Tonsillitiden verantwortlich. Die Rolle der Ko-Infektion in der Entstehung und im Verlauf der akuten Tonsillitis muss in weiteren Untersuchungen erforscht werden.
Schätzungen zufolge sind weltweit etwa 71 Millionen Menschen chronisch mit dem Hepatitis-C-Virus (HCV) infiziert. Im Jahre 2016 sind rund 400.000 Menschen an einer HCV-bedingten Lebererkrankung gestorben, insbesondere aufgrund der Entwicklung von Leberzirrhose und Lebertumoren. Trotz der großen Unterschiede in den Prävalenzschätzungen und der Qualität der epidemiologischen Daten zeigt die jüngste weltweite Bewertung, dass die virämische Ausbreitung der HCV-Infektion (Prävalenz der HCV-RNA) in den meisten Industrieländern, einschließlich der USA, weniger als 1,0% beträgt (www .cdc.gov / Hepatitis / HCV). In einigen osteuropäischen Ländern wie Lettland (2,2%) oder Russland (3,3%) und bestimmten Ländern in Afrika, Ägypten (6,3%) und Gabun (7,0%) oder im Nahen Osten Syriens (3,0%) ist die Prävalenz bemerkenswert höher. In den USA und den am weitesten entwickelten Ländern gilt die gemeinsame Nutzung von Werkzeugezur Herstellung von Arzneimitteln und zur Injektion von Medikamenten (Nadeln) als die häufigste derzeitige Übertragungsart. Die vorherrschende Übertragungsart in Ländern, in denen die Ausbreitung von HCV-Infektionen im Vergleich zu den Industrieländern höher ist, beruht jedoch auf schlechten Methoden zur Infektionskontrolle und unsicherer Handhabung von Injektionsnadeln.
Wenn die chronische Infektion unbehandelt bleibt, kann sich im fortschreitenden Verlauf eine Zirrhose oder ein hepatozelluläres Karzinom bilden (Alter H. J. und Seef L. B. 2000). Die Doppeltherapie, bei der es sich um eine Kombination aus pegyliertem Interferon-α (PEG IFNα) und Ribavirin (riba) handelt, war in einigen Ländern der Dritten Welt bis vor kurzem der goldene Standard für die Behandlung von Patienten mit chronischer Hepatitis C und hat eine anhaltende virologische Reaktion erzielt. Mit nur 50% der mit HCV-Genotyp 1 infizierten Patienten (der häufigere) im Vergleich zu 80% mit Genotyp 2 oder 3, obwohl sie kostspielig und langwierig sind (z. B. 24-48 Wochen) und zahlreiche harte Nebenwirkungen aufweisen, die schwer zu bekämpfen sind tolerieren (Erklärung der National Institutes of Health Consensus Development Conference: Management von Hepatitis C: 2002 - 10.-12. Juni 2002 2002). Die Identifizierung des JFH1 (japanische fulminante Hepatitis Typ 1) -Isolats wurde in einigen in vitro-Studien zu HCV als wichtiger Durchbruch bei der HCV-Behandlung angesehen. Die Verwendung dieses Isolats führte nachfolgend zu einem besseren Verständnis des HCV-Lebenszyklus und der 3D-Strukturen der viralen Proteine. Basierend auf dieser Erkenntnis konnten die ersten direkt wirkenden antiviralen Mittel (DAAs) entwickelt werden, die spezifisch virale Proteine beeinflussen. Die beiden Proteasehemmer (PI) Telaprevir und Boceprevir hemmen die virale NS3-4A-Protease und wurden 2011 als Kombinationstherapie mit PEG IFNα und Ribavirin zugelassen, was die anhaltende virologische Reaktion auf 67-75% erhöhte (Pawlotsky et al. 2015).
Die Optimierung der gegenwärtigen Arzneimittelregime, die Einschränkung des Problems der Mutationsresistenz, die Gestaltung einer individualisierten Therapie, der Zugang zu diesen therapeutischen antiviralen Arzneimitteln und ihr hoher Preis bleiben weiterhin eine Herausforderung (Pawlotsky 2016; Pawlotsky et al. 2015; Sarrazin 2016). Die Entwicklung eines Impfstoffs wird jedoch als größte Herausforderung für die weltweite Kontrolle von HCV angesehen (Bukh 2016). Aus diesem Grund ist es wichtig, weiterhin mehr über den HCV-Lebenszyklus und die Faktoren zu erfahren, die sich auf die Replikation und den gesamten Lebenszyklus auswirken können, um effiziente, qualitativ hochwertige und vor allem leicht zugängliche Behandlungen für alle Menschen weltweit zu entwickeln.
Der Lipidstoffwechsel und insbesondere das Cholesteringleichgewicht werden durch die HCV-Infektion beeinflusst. Die Korrelation zwischen Lipidstoffwechsel und HCV wurde klinisch seit langem beobachtet. In den Leberbiopsien von mit HCV infizierten Patienten wurde ein Anstieg der in den Lipidtröpfchen im Cytosol akkumulierten neutralen Lipide festgestellt (Dienes et al. 1982). Das Hepatitis-C-Virus wurde auch von Hypobetalipoproteinämie, Hypocholesterinämie und Lebersteatose begleitet (Schaefer und Chung 2013). Die Leber ist der primäre Ort für die Synthese, Speicherung und Oxidation von Lipiden und anderen Makromolekülen. Daher ist der Fettstoffwechsel in der Leber für die Aufrechterhaltung der systemischen Nährstoffhomöostase von wesentlicher Bedeutung. Eine Dysregulation des Leberlipidstoffwechsels ist ein Kennzeichen mehrerer Krankheiten wie Diabetes, alkoholische und nichtalkoholische Fettlebererkrankungen sowie parasitäre und virale Infektionen, einschließlich einer HCV-Infektion. (Erklärung der National Institutes of Health Consensus Development Conference: Management von Hepatitis C: 2002 - 10.-12. Juni 2002 2002; Fon Tacer und Rozman 2011; Chen et al. 2013; Reddy und Rao 2006; Visser et al. 2013; Wu und Parhofer 2014)
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Characteristics and clinical outcome of breast cancer patients with asymptomatic brain metastases
(2020)
Simple Summary: The prognosis for patients with breast cancer that has spread to the brain is poor, and survival for these women hasn’t improved over the last few decades. We do not currently test for asymptomatic brain metastases in breast cancer patients, although this does happen in some other types of cancer. In this study we wanted to find out more about breast cancer that has spread to the brain and in particular to see whether there might be any advantage to spotting brain metastases before the development of neurological symptoms. Overall, our results suggest that women could be better off if their brain metastases are diagnosed before they begin to cause symptoms. We now need to carry out a clinical trial to see what happens if we screen high-risk breast cancer patients for brain metastases. This will verify whether doing so could increase survival, symptom control or quality of life.
Abstract: Background: Brain metastases (BM) have become a major challenge in patients with metastatic breast cancer. Methods: The aim of this analysis was to characterize patients with asymptomatic BM (n = 580) in the overall cohort of 2589 patients with BM from our Brain Metastases in Breast Cancer Network Germany (BMBC) registry. Results: Compared to symptomatic patients, asymptomatic patients were slightly younger at diagnosis (median age: 55.5 vs. 57.0 years, p = 0.01), had a better performance status at diagnosis (Karnofsky index 80–100%: 68.4% vs. 57%, p < 0.001), a lower number of BM (>1 BM: 56% vs. 70%, p = 0.027), and a slightly smaller diameter of BM (median: 1.5 vs. 2.2 cm, p < 0.001). Asymptomatic patients were more likely to have extracranial metastases (86.7% vs. 81.5%, p = 0.003) but were less likely to have leptomeningeal metastasis (6.3% vs. 10.9%, p < 0.001). Asymptomatic patients underwent less intensive BM therapy but had a longer median overall survival (statistically significant for a cohort of HER2-positive patients) compared to symptomatic patients (10.4 vs. 6.9 months, p < 0.001). Conclusions: These analyses show a trend that asymptomatic patients have less severe metastatic brain disease and despite less intensive local BM therapy still have a better outcome (statistically significant for a cohort of HER2-positive patients) than patients who present with symptomatic BM, although a lead time bias of the earlier diagnosis cannot be ruled out. Our analysis is of clinical relevance in the context of potential trials examining the benefit of early detection and treatment of BM.
The ecological validity of neuropsychological testing (NT) has been questioned in the sports environment. A frequent criticism is that NT, mostly consisting of pen and paper or digital assessments, lacks relevant bodily movement. This study aimed to identify the determinants of a newly developed testing battery integrating both cognitive and motor demands. Twenty active individuals (25 ± 3 years, 11 males) completed the new motor-cognitive testing battery (MC), traditional NT (Stroop test, Trail Making test, Digit Span test) and isolated assessments of motor function (MF; Y-balance test, 20m-sprint, counter-movement jump). Kendal’s tau and partial Spearman correlations were used to detect associations between MC and NT/MF. Except for two items (Reactive Agility A and counter-movement jump; Run-Decide and sprint time; r = 0.37, p < 0.05), MC was not related to MF. Similarly, MC and NT were mostly unrelated, even when controlling for the two significant motor covariates (p > 0.05). The only MC item with (weak to moderate) associations to NT was the Memory Span test (Digit Span backwards and composite; r = 0.43–0.54, p < 0.05). In sum, motor-cognitive function appears to be largely independent from its two assumed components NT and MF and may represent a new parameter in performance diagnostics.
Background: A large number of idiosyncratic drug induced liver injury (iDILI) and herb induced liver injury(HILI) cases of variable quality has been published but some are a matter of concern if the cases were not evaluated for causality using a robust causality assessment method (CAM) such as RUCAM (Roussel Uclaf Causality Assessment Method) as diagnostiinjuryc algorithm. The purpose of this analysis was to evaluate the worldwide use of RUCAM in iDILI and HILI cases. Methods: The PubMed database (1993–30 June 2020) was searched for articles by using the following key terms: Roussel Uclaf Causality Assessment Method; RUCAM; Idiosyncratic drug induced liver injury; iDILI; Herb induced liver injury; HILI. Results: Considering reports published worldwide since 1993, our analysis showed the use of RUCAM for causality assessment in 95,885 cases of liver injury including 81,856 cases of idiosyncratic DILI and 14,029 cases of HILI. Among the top countries providing RUCAM based DILI cases were, in decreasing order, China, the US, Germany, Korea, and Italy, with China, Korea, Germany, India, and the US as the top countries for HILI. Conclusion: Since 1993 RUCAM is certainly the most widely used method to assess causality in IDILI and HILI. This should encourage practitioner, experts, and regulatory agencies to use it in order to reinforce their diagnosis and to take sound decisions.
Colorectal cancer (CRC) is one of the most frequently diagnosed tumor in humans and one of the most common causes of cancer-related death worldwide. The pathogenesis of CRC follows a multistage process which together with somatic gene mutations is mainly attributed to the dysregulation of signaling pathways critically involved in the maintenance of homeostasis of epithelial integrity in the intestine. A growing number of studies has highlighted the critical impact of members of the tripartite motif (TRIM) protein family on most types of human malignancies including CRC. In accordance, abundant expression of many TRIM proteins has been observed in CRC tissues and is frequently correlating with poor survival of patients. Notably, some TRIM members can act as tumor suppressors depending on the context and the type of cancer which has been assessed. Mechanistically, most cancer-related TRIMs have a critical impact on cell cycle control, apoptosis, epithelial–mesenchymal transition (EMT), metastasis, and inflammation mainly through directly interfering with diverse oncogenic signaling pathways. In addition, some recent publications have emphasized the emerging role of some TRIM members to act as transcription factors and RNA-stabilizing factors thus adding a further level of complexity to the pleiotropic biological activities of TRIM proteins. The current review focuses on oncogenic signaling processes targeted by different TRIMs and their particular role in the development of CRC. A better understanding of the crosstalk of TRIMs with these signaling pathways relevant for CRC development is an important prerequisite for the validation of TRIM proteins as novel biomarkers and as potential targets of future therapies for CRC.
Hypertonie stellt in der westlichen Welt die Haupttodesursache dar, obwohl sie im Hinblick auf die pharmakologischen Therapieoptionen gut behandelbar ist. Hauptursächlich ist hierfür eine, vor allem durch eine Non-Adhärenz (u.a. bedingt durch den asymptomatischen Charakter) und in selteneren Fällen eine aufgrund einer therapieresistente Hypertonie (TRH) verursachte, unzureichende Blutdruckkontrolle. Eine Möglichkeit zur Überprüfung der Therapietreue in der antihypertensiven Therapie ist der qualitative Nachweis der Arzneistoffe im Blut oder Urin. Unklar ist, inwiefern die Substanzen in einer biologischen Probe innerhalb des Dosierungsintervalls oder darüber hinaus nachweisbar sind und es zu einer Falschbeurteilung kommen kann.
Daher wurde eine quantitative chromatographisch-tandem-massenspektrometrische Methode für das Therapeutische Drug Monitoring von blutdrucksenkenden Arzneistoffen entwickelt und analytisch vollständig validiert. Bei 38 Patienten mit überwachter Medikamenteneinnahme wurde die Aussagekraft der Methode hinsichtlich der Bestätigung einer Adhärenz zunächst mittels zweier Wirkstoffkonzentrationen im Serum (Tal- und Spitzenspiegel) überprüft. Zur Bewertung der Konzentrationen wurden zwei Konzepte evaluiert. Einerseits wurde die untere Grenze des therapeutischen Referenzbereiches (TRR, Literaturdaten) und andererseits die mittels Rechenmodell (Daten pharmakokinetischer Studien) individuell ermittelte, dosisbezogene Arzneimittelkonzentration (DRC) evaluiert. In einem zweiten Studienansatz wurde diese neue quantitative Methode an einem Kollektiv von 36 ambulanten Patienten (ohne überwachte Medikamenteneinnahme) angewendet und zur Überprüfung der Aussagekraft mit Ergebnissen des etablierten Urinscreenings verglichen.
Die gemessenen Wirkstoffkonzentrationen von Atenolol (64 bis 564 ng/ml), Bisoprolol (2,5 bis 53 ng/ml), Metoprolol (5,8 bis 110 ng/ml), Nebivolol (0,32 bis 3,4 ng/ml), Hydrochlorothiazid (15 bis 606 ng/ml), Furosemid (22 ng/ml), Torasemid (17 bis 1829 ng/ml), Canrenon (25 bis 221 ng/ml), Amlodipin (2,4 bis 35 ng/ml), Lercanidipin (0,24 bis 21 ng/ml), Candesartan (6,0 bis 268 ng/ml), Telmisartan (22 bis 375 ng/ml) und Valsartan (115 bis 7962 ng/ml) haben gezeigt, dass die quantitative Analyse von Antihypertensiva in Serumproben und deren Auswertung auf Basis der individuell berechneten unteren DRC in der Beurteilung einer Adhärenz vielversprechend ist.
Die Auswertung auf Basis der unteren Grenze des TRR signalisierte bei den stationären Patienten (überwachte Einnahme) innerhalb der Substanzklasse der Diuretika (ohne Torasemid) bei 16,7 %, der β-Blocker bei 29,4 %, der Calciumkanal-Blocker bei 14,8 % und der AT1-Antagonisten bei 25 % fälschlicherweise eine Non-Adhärenz.
Die rein qualitative Urinanalyse zeigte im Falle der β-Blocker Atenolol, Bisoprolol und des Diuretikums HCT aufgrund einer hohen Bioverfügbarkeit, einer langen Halbwertszeit oder einer überwiegend renalen Ausscheidung der Muttersubstanz ein Nachweisfenster über das Dosierungsintervall hinaus, was bedingt, dass einige Patienten fälschlicherweise als adhärent gewertet wurden. Ein anderes Problem zeigte sich bei einigen Patienten, die mit dem AT1-Antagonist Candesartan oder dem Calciumkanal-Blocker Lercanidipin behandelt wurden und die als non-adhärent eingestuft wurden. Eine geringe Bioverfügbarkeit, eine hohe Metabolisierungsrate oder geringe renale Ausscheidung der unveränderten Arzneistoffe lies auf eine mangelhafte Nachweisbarkeit innerhalb des Dosierungsintervalls und damit auf eine eingeschränkte Beurteilbarkeit schließen.
Aus den Untersuchungen ergibt sich, dass es bei Anwendung qualitativer Nachweismethoden aufgrund besonderer Pharmakokinetiken einzelner antihypertensiver Wirkstoffe zur Fehleinschätzung der Adhärenz kommen kann. Die neu entwickelte Methodik in Form einer quantitativen Serumanalyse ist unter Verwendung patientenindividueller Bewertungskriterien bei dieser Fragestellung überlegen.
Postoperative thrombotic thrombocytopenic purpura (TTP) shows clinical presentation similar to classical TTP, whereas exact pathophysiological contexts remain unexplained. In this study, we investigated intraoperative and postoperative changes in ADAMTS-13 (a disintegrin and metalloprotease with thrombospondin type 1 motifs, member 13), von Willebrand factor (VWF), large VWF multimers, and interleukin-6 (IL-6) in vascular surgery patients. The objective was to compare the impact of endovascular, peripheral, and aortic surgery on target parameters which are supposed to play a role in surgery-associated TTP. A total of 93 vascular surgery patients were included and divided into 4 groups according to the specific type of intervention they underwent. Blood samples were taken preoperatively, intraoperatively, and postoperatively on days 2 and 4. The ADAMTS-13 activity decreased significantly in 3 of the 4 groups during surgery (from median 81% to 49%, P < .001, in the group undergoing aortoiliacal interventions), whereas the percentage of large VWF multimers increased in all groups of patients. von Willebrand factor antigen increased significantly in all groups on postoperative day 2 and IL-6 increased significantly in the intraoperative and early postoperative period. There was no significant correlation between the intraoperative decrease in ADAMTS-13 and the increase in VWF or IL-6. No patient in this study showed clinical picture of TTP; the precise cause and clinical significance of moderately reduced ADAMTS-13 activity in the perioperative setting have not yet been definitely determined.
Background: Macrophage Migration Inhibitory Factor (MIF) is highly elevated after cardiac surgery and impacts the postoperative inflammation. The aim of this study was to analyze whether the polymorphisms CATT5–7 (rs5844572/rs3063368,“-794”) and G>C single-nucleotide polymorphism (rs755622,-173) in the MIF gene promoter are related to postoperative outcome. Methods: In 1116 patients undergoing cardiac surgery, the MIF gene polymorphisms were analyzed and serum MIF was measured by ELISA in 100 patients. Results: Patients with at least one extended repeat allele (CATT7) had a significantly higher risk of acute kidney injury (AKI) compared to others (23% vs. 13%; OR 2.01 (1.40–2.88), p = 0.0001). Carriers of CATT7 were also at higher risk of death (1.8% vs. 0.4%; OR 5.12 (0.99–33.14), p = 0.026). The GC genotype was associated with AKI (20% vs. GG/CC:13%, OR 1.71 (1.20–2.43), p = 0.003). Multivariate analyses identified CATT7 predictive for AKI (OR 2.13 (1.46–3.09), p < 0.001) and death (OR 5.58 (1.29–24.04), p = 0.021). CATT7 was associated with higher serum MIF before surgery (79.2 vs. 50.4 ng/mL, p = 0.008). Conclusion: The CATT7 allele associates with a higher risk of AKI and death after cardiac surgery, which might be related to chronically elevated serum MIF. Polymorphisms in the MIF gene may constitute a predisposition for postoperative complications and the assessment may improve risk stratification and therapeutic guidance.
Simple Summary: Glioblastomas are very malignant and essentially incurable brain tumors. One problem is the extensive penetration of tumor cells into the adjacent normal brain tissue. Thus, the testing of novel drugs requires appropriate tumor models, preferentially avoiding animal studies. This paper describes so-called brain tissue slice tandem-culture systems. They consist of a slice of normal brain tissue and a second layer of tumor tissue. The microscopic analysis of these slice tandem-cultures allows for the simultaneous assessment of single cells invading into the normal brain tissue and the space occupying growth of the total tumor mass. It is shown that the direct application of test drugs onto the slices exerts inhibitory effects on both mechanisms. We thus describe a system mimicking the situation in glioblastoma patients. It reduces animal studies, allows for the direct application of test drugs and the precise quantitation of their inhibitory effects on tumor growth and invasion.
Abstract: Glioblastomas (GBMs) are the most malignant brain tumors and are essentially incurable even after extensive surgery, radiotherapy, and chemotherapy, mainly because of extensive infiltration of tumor cells into the adjacent normal tissue. Thus, the evaluation of novel drugs in malignant glioma treatment requires sophisticated ex vivo models that approach the authentic interplay between tumor and host environment while avoiding extensive in vivo studies in animals. This paper describes the standardized setup of an organotypic brain tissue slice tandem-culture system, comprising of normal brain tissue from adult mice and tumor tissue from human glioblastoma xenografts, and explore its utility for assessing inhibitory effects of test drugs. The microscopic analysis of vertical sections of the slice tandem-cultures allows for the simultaneous assessment of (i) the invasive potential of single cells or cell aggregates and (ii) the space occupying growth of the bulk tumor mass, both contributing to malignant tumor progression. The comparison of tissue slice co-cultures with spheroids vs. tissue slice tandem-cultures using tumor xenograft slices demonstrates advantages of the xenograft tandem approach. The direct and facile application of test drugs is shown to exert inhibitory effects on bulk tumor growth and/or tumor cell invasion, and allows their precise quantitation. In conclusion, we describe a straightforward ex vivo system mimicking the in vivo situation of the tumor mass and the normal brain in GBM patients. It reduces animal studies and allows for the direct and reproducible application of test drugs and the precise quantitation of their effects on the bulk tumor mass and on the tumor’s invasive properties
Background: Balloon pulmonary angioplasty is an evolving, interventional treatment option for inoperable patients with chronic thromboembolic pulmonary hypertension (CTEPH). Pulmonary hypertension at rest as well as exercise capacity is considered to be relevant outcome parameters. The aim of the present study was to determine whether measurement of pulmonary hemodynamics during exercise before and six months after balloon pulmonary angioplasty have an added value.
Methods: From March 2014 to July 2018, 172 consecutive patients underwent balloon pulmonary angioplasty. Of these, 64 consecutive patients with inoperable CTEPH underwent a comprehensive diagnostic workup that included right heart catheterization at rest and during exercise before balloon pulmonary angioplasty treatments and six months after the last intervention.
Results: Improvements in pulmonary hemodynamics at rest and during exercise, in quality of life, and in exercise capacity were observed six months after balloon pulmonary angioplasty: WHO functional class improved in 78% of patients. The mean pulmonary arterial pressure (mPAP) at rest was reduced from 41 ± 9 to 31 ± 9 mmHg (p < 0.0001). The mPAP/cardiac output slope decreased after balloon pulmonary angioplasty (11.2 ± 25.6 WU to 7.7 ± 4.1 WU; p < 0.0001), and correlated with N-terminal fragment of pro-brain natriuretic peptide (p = 0.035) and 6-minute walking distance (p = 0.01).
Conclusions: Exercise right heart catheterization provides valuable information on the changes of pulmonary hemodynamics after balloon pulmonary angioplasty in inoperable CTEPH patients that are not obtainable by measuring resting hemodynamics.
Resistance exercise has been demonstrated to improve brain function. However, the optimal workout characteristics are a matter of debate. This randomized, controlled trial aimed to elucidate differences between free-weight (REfree) and machine-based (REmach) training with regard to their ability to acutely enhance cognitive performance (CP). A total of n = 46 healthy individuals (27 ± 4 years, 26 men) performed a 45-min bout of REfree (military press, barbell squat, bench press) or REmach (shoulder press, leg press, chest press). Pre- and post-intervention, CP was examined using the Stroop test, Trail Making Test and Digit Span test. Mann–Whitney U tests did not reveal between-group differences for performance in the Digit Span test, Trail Making test and the color and word conditions of the Stroop test (p > 0.05). However, REfree was superior to REmach in the Stroop color-word condition (+6.3%, p = 0.02, R = 0.35). Additionally, REfree elicited pre-post changes in all parameters except for the Digit Span test and the word condition of the Stroop test while REmach only improved cognitive performance in part A of the Trail Making test. Using free weights seems to be the more effective RE method to acutely improve cognitive function (i.e., inhibitory control). The mechanisms of this finding merit further investigation.
Obstructive Sleep Apnea is emerging as a global health epidemic, particularly due to the obesity pandemic. However, comprehensive prevalence data are still lacking and global OSA research has not yet been structurally evaluated. Using the latest comprehensive age/gender-specific BMI and obesity data, a global landscape estimating the risk/burden of OSA was created. Results were presented in relation to an in-depth analysis of OSA research and countries’ socioeconomic/scientific background. While the USA, Canada, and Japan are the highest publishing countries on OSA, Iceland, Greece, and Israel appeared at the forefront when relating the scientific output to socioeconomic parameters. Conversely, China, India, and Russia showed relatively low performances in these relations. Analysis of the estimated population at risk (EPR) of OSA showed the USA, China, India, and Brazil as the leading countries. Although the EPR and OSA research correlated strongly, major regional discrepancies between the estimated demand and actual research performances were identified, mainly in, but not limited to, developing nations. Our study highlights regional challenges/imbalances in the global activity on OSA and allows targeted measures to mitigate the burden of undiagnosed/untreated OSA. Furthermore, the inclusion of disadvantaged countries in international collaborations could stimulate local research efforts and provide valuable insights into the regional epidemiology of OSA.
The paper contains an analysis of typologies and designations of diseases in three medical handbooks dating from the turn of the 18th century. These guides for non-experts inform readers how plant remedies help prevent and fight diseases. The classification in the books is based on the parts of the body affected by the disease. Frequently, neither the definitions nor the causes of the diseases correspond to those found in contemporary medical books.
Die CT-Diagnostik gewinnt auch über 100 Jahre nach der Entdeckung der Röntgenstrahlung noch immer weiter an Bedeutung im klinischen Alltag. Insbesondere im Bereich des Stagings und der onkologischen Follow-Up-Untersuchungen zählt die Ganzkörper-CT derzeit vielerorts als diagnostischer Goldstandard. Dabei muss jedoch in Kauf genommen werden, dass es zur Applikation nicht unerheblicher Dosiswerte kommt. Das Risiko von Folgeschäden ist dabei nicht von der Hand zu weisen, wobei das Folgemalignom als besonders gefürchtete Komplikation gilt. Die Optimierung der Computertomographie und die Minimierung möglicher Folgeschäden ist daher Gegenstand konstanter klinischer Forschung. Dennoch muss eine Reduktion der Strahlendosis nur äußerst feinfühlig erfolgen, da sie auf technischer Ebene eng mit der realisierbaren Bildqualität korreliert.
Ziel der vorliegenden Arbeit war es, die Nutzen eines 150 kV + Sn Zinnfilter- Protokolls am Gerät Siemens Somatom Force zu untersuchen. Hierbei sollte vor allem darauf eingegangen werden, wie viel Strahlendosis durch die Implementierung eines solchen Protokolls eingespart werden kann, wie sich das Protokoll auf die subjektive und objektive Bildqualität auswirkt, sowie welcher weitere klinische Nutzen zu erwarten ist. Bisher konnten sich ähnliche Protokolle bereits im Rahmen anderer Fragestellungen als nützlich beweisen.
Insgesamt 40 Patienten mit Ganzkörper-Staging im Rahmen eines Multiplen Myeloms wurden in die Studie inkludiert (28 Frauen, 12 Männer). Diese wurden im vereinbarten Untersuchungszeitraum mit dem durch die Ethikkomission genehmigten Studienprotokoll (150 kV + Sn Force) untersucht und waren jeweils retrospektiv auch Teil der anderen Gruppen gewesen (120 KV Definition AS, 120 KV Flash, 120 kV Force).
Auch wenn der intraindividuelle Vergleich inhärent mit einer höheren statistischen Power einhergeht, wurden sicherheitshalber an vordefinierten Stellen Querdurchmesser der Patienten erhoben, um biometrische Gleichheit zu beweisen.
Hier ließen sich keine signifikanten Unterschiede messen. Die Bilddaten der Patienten wurden randomisiert und doppelt verblindet von zwei dem Projekt fremden und berufserfahrenen Radiologen hinsichtlich der subjektiven Bildqualität ausgewertet. Ein Bezug zu den technischen Hintergrundinformationen der Aufnahme war zu keinem Zeitpunkt möglich.
Anschließend erfolgte die statistische Auswertung objektiver Daten. Zum Vergleich der Bildqualität wurden jeweils gemittelte Schwächungswerte aus Muskeln aus artefaktfreien und aus von Artefakten beladenen Arealen erhoben. Aufgrund des homogenen Charakters der Muskeln wurde die ebenso jeweils gemittelte Standardabweichung dieser Strukturen als Hintergrundrauschen definiert. Hieraus wurde eine SNR errechnet.
Der Vergleich von Dosiswerten erfolgte über die aus dem Patientenprotokoll entnehmbaren Angaben, insbesondere des CTDI. Gemeinsam mit den erhobenen Querdurchmessern wurde hieraus eine SSDE gebildet.
Bei allen subjektiven Vergleichen der Studiengruppe (150 kV + Sn Force) wurde bei jeweils starker Korrelation nach Spearman und starker bis sehr starker Übereinstimmung nach Cohen eine gute bis sehr gute Bildqualität attestiert. Damit stellt das Untersuchungsprotokoll Bilder durchweg besser als das Referenzprotokoll auf den Geräten Somatom Definition AS und Somatom Definition Flash dar. Im Direktvergleich zum Referenzprotokoll auf dem Somatom Force ist das Studienprotokoll jeweils mindestens gleichwertig.
Im objektiven Vergleich der Bildqualität zeigte sich als Gütekriterium zunächst, dass Muskeln artefaktfreier Areale in allen vier Gruppen gleich gut dargestellt werden. Bereits bei der Betrachtung der Schwächungswerte artefaktbeladener Muskeln wurde deutlich, dass die anderen Protokolle mit signifikant höherem Signalverlust zu kämpfen haben. Auch das Bildpunktrauschen war in der Studiengruppe (150 kV + Sn Force) überwiegend signifikant niedriger, als das der anderen Gruppen. Lediglich in Artefaktarealen des Untersuchungsabschnitts cCT/HWS konnte die Gruppe 120 kV Force vergleichbar niedrige Rauschwerte aufweisen (p = 1), der Vergleich der SNR wiederholte dieses Ergebnis.
CTDI und SSDE der Gruppe
150 kV Force zeigten im Untersuchungsabschnitt cCT/HWS insbesondere der Gruppe 120 kV Force gegenüber signifikante Dosiseinsparungen von ca. 42 %, im Abschnitt Tho-Knie sogar 64%.
Zusammenfassend zeigte sich durch die Implementierung des Studienprotokolls also mehrheitlich eine Verbesserung sowohl der subjektiven, als auch der objektiven Bildqualität. Bei einer durchschnittlichen Reduktion der applizierten Strahlendosis von ca. 40-60 % (gegenüber dem Referenzprotokoll am Somatom Force) ist der Einsatz des Studienprotokolls für die hier untersuchte Fragestellung im klinischen Alltag also uneingeschränkt zu empfehlen.
Background: While systemic inflammation is recognized as playing a central role in the pathogenesis of organ failures in patients with liver cirrhosis, less is known about its relevance in the development of classical hepatic decompensation. Aim: To characterize the relationship between systemic inflammation, hemodynamics, and anemia with decompensation of liver cirrhosis. Methods: This is a post-hoc analysis of a cohort study of outpatients with advanced liver fibrosis or cirrhosis. Results: Analysis included 338 patients of whom 51 patients (15%) were hospitalized due to decompensation of liver cirrhosis during a median follow-up time of six months. In univariate analysis, active alcoholism (p = 0.002), model of end-stage liver disease (MELD) score (p = 0.00002), serum IL-6 concentration (p = 0.006), heart rate (p = 0.03), low arterial blood pressure (p < 0.05), maximal portal venous flow (p = 0.008), and low hemoglobin concentration (p < 0.00001) were associated with hospitalization during follow-up. Multivariate analysis revealed an independent association of low hemoglobin (OR = 0.62, 95% CI = 0.51–0.78, p = 0.001) and serum IL-6 concentration (OR = 1.02, 95% CI = 1.01–1.04, p = 0.03)—but not of hemodynamic parameters—with hepatic decompensation. An inverse correlation between hemoglobin concentration and portal venous flow (R = −0.362, p < 0.0001) was detected for the non-hospitalized patients. Accuracy of baseline hemoglobin levels for predicting hospitalization (AUC = 0.84, p < 0.000001) was high. Conclusion: Anemia and systemic inflammation, rather than arterial circulatory dysfunction, are strong and independent predictors of hepatic decompensation in outpatients with liver cirrhosis.
Background: Sepsis frequently occurs after major trauma and is closely associated with dysregulations in the inflammatory/complement and coagulation system. Thrombin-activatable fibrinolysis inhibitor (TAFI) plays a dual role as an anti-fibrinolytic and anti-inflammatory factor by downregulating complement anaphylatoxin C5a. The purpose of this study was to investigate the association between TAFI and C5a levels and the development of post-traumatic sepsis. Furthermore, the predictive potential of both TAFI and C5a to indicate sepsis occurrence in polytraumatized patients was assessed. Methods: Upon admission to the emergency department (ED) and daily for the subsequent ten days, circulating levels of TAFI and C5a were determined in 48 severely injured trauma patients (injury severity score (ISS) ≥ 16). Frequency matching according to the ISS in septic vs. non-septic patients was performed. Trauma and physiologic characteristics, as well as outcomes, were assessed. Statistical correlation analyses and cut-off values for predicting sepsis were calculated. Results: Fourteen patients developed sepsis, while 34 patients did not show any signs of sepsis (no sepsis). Overall injury severity, as well as demographic parameters, were comparable between both groups (ISS: 25.78 ± 2.36 no sepsis vs. 23.46 ± 2.79 sepsis). Septic patients had significantly increased C5a levels (21.62 ± 3.14 vs. 13.40 ± 1.29 ng/mL; p < 0.05) and reduced TAFI levels upon admission to the ED (40,951 ± 5637 vs. 61,865 ± 4370 ng/mL; p < 0.05) compared to the no sepsis group. Negative correlations between TAFI and C5a (p = 0.0104) and TAFI and lactate (p = 0.0423) and positive correlations between C5a and lactate (p = 0.0173), as well as C5a and the respiratory rate (p = 0.0266), were found. In addition, correlation analyses of both TAFI and C5a with the sequential (sepsis-related) organ failure assessment (SOFA) score have confirmed their potential as early sepsis biomarkers. Cut-off values for predicting sepsis were 54,857 ng/mL for TAFI with an area under the curve (AUC) of 0.7550 (p = 0.032) and 17 ng/mL for C5a with an AUC of 0.7286 (p = 0.034). Conclusion: The development of sepsis is associated with early decreased TAFI and increased C5a levels after major trauma. Both elevated C5a and decreased TAFI may serve as promising predictive factors for the development of sepsis after polytrauma.
Low-to-moderate quality meta-analytic evidence shows that motor control stabilisation exercise (MCE) is an effective treatment of non-specific low back pain. A possible approach to overcome the weaknesses of traditional meta-analyses would be that of a prospective meta-analyses. The aim of the present analysis was to generate high-quality evidence to support the view that motor control stabilisation exercises (MCE) lead to a reduction in pain intensity and disability in non-specific low back pain patients when compared to a control group. In this prospective meta-analysis and sensitivity multilevel meta-regression within the MiSpEx-Network, 18 randomized controlled study arms were included. Participants with non-specific low back pain were allocated to an intervention (individualized MCE, 12 weeks) or a control group (no additive exercise intervention). From each study site/arm, outcomes at baseline, 3 weeks, 12 weeks, and 6 months were pooled. The outcomes were current pain (NRS or VAS, 11 points scale), characteristic pain intensity, and subjective disability. A random effects meta-analysis model for continuous outcomes to display standardized mean differences between intervention and control was performed, followed by sensitivity multilevel meta-regressions. Overall, 2391 patients were randomized; 1976 (3 weeks, short-term), 1740 (12 weeks, intermediate), and 1560 (6 months, sustainability) participants were included in the meta-analyses. In the short-term, intermediate and sustainability, moderate-to-high quality evidence indicated that MCE has a larger effect on current pain (SMD = −0.15, −0.15, −0.19), pain intensity (SMD = −0.19, −0.26, −0.26) and disability (SMD = −0.15, −0.27, −0.25) compared with no exercise intervention. Low-quality evidence suggested that those patients with comparably intermediate current pain and older patients may profit the most from MCE. Motor control stabilisation exercise is an effective treatment for non-specific low back pain. Sub-clinical intermediate pain and middle-aged patients may profit the most from this intervention.
Reduced external knee adduction moments in the second half of stance after total hip replacement have been reported in hip osteoarthritis patients. This reduction is thought to shift the load from the medial to the lateral knee compartment and as such increase the risk for knee osteoarthritis. The knee adduction moment is a surrogate for the load distribution between the medial and lateral compartments of the knee and not a valid measure for the tibiofemoral contact forces which are the result of externally applied forces and muscle forces. The purpose of this study was to investigate whether the distribution of the tibiofemoral contact forces over the knee compartments in unilateral hip osteoarthritis patients 1 year after receiving a primary total hip replacement differs from healthy controls. Musculoskeletal modeling on gait was performed in OpenSim using the detailed knee model of Lerner et al. (2015) for 19 patients as well as for 15 healthy controls of similar age. Knee adduction moments were calculated by the inverse dynamics analysis, medial and lateral tibiofemoral contact forces with the joint reaction force analysis. Moments and contact forces of patients and controls were compared using Statistical Parametric Mapping two-sample t-tests. Knee adduction moments and medial tibiofemoral contact forces of both the ipsi- and contralateral leg were not significantly different compared to healthy controls. The contralateral leg showed 14% higher medial tibiofemoral contact forces compared to the ipsilateral (operated) leg during the second half of stance. During the first half of stance, the lateral tibiofemoral contact force of the contralateral leg was 39% lower and the ratio 32% lower compared to healthy controls. In contrast, during the second half of stance the forces were significantly higher (39 and 26%, respectively) compared to healthy controls. The higher ratio indicates a changed distribution whereas the increased lateral tibiofemoral contact forces indicate a higher lateral knee joint loading in the contralateral leg in OA patients after total hip replacement (THR). Musculoskeletal modeling using a detailed knee model can be useful to detect differences in the load distribution between the medial and lateral knee compartment which cannot be verified with the knee adduction moment.
Objective: Many patients with localized prostate cancer (PCa) do not immediately undergo radical prostatectomy (RP) after biopsy confirmation. The aim of this study was to investigate the influence of “time-from-biopsy-to- prostatectomy” on adverse pathological outcomes.
Materials and Methods: Between January 2014 and December 2019, 437 patients with intermediate- and high risk PCa who underwent RP were retrospectively identified within our prospective institutional database. For the aim of our study, we focused on patients with intermediate- (n = 285) and high-risk (n = 151) PCa using D'Amico risk stratification. Endpoints were adverse pathological outcomes and proportion of nerve-sparing procedures after RP stratified by “time-from-biopsy-to-prostatectomy”: ≤3 months vs. >3 and < 6 months. Medians and interquartile ranges (IQR) were reported for continuously coded variables. The chi-square test examined the statistical significance of the differences in proportions while the Kruskal-Wallis test was used to examine differences in medians. Multivariable (ordered) logistic regressions, analyzing the impact of time between diagnosis and prostatectomy, were separately run for all relevant outcome variables (ISUP specimen, margin status, pathological stage, pathological nodal status, LVI, perineural invasion, nerve-sparing).
Results: We observed no difference between patients undergoing RP ≤3 months vs. >3 and <6 months after diagnosis for the following oncological endpoints: pT-stage, ISUP grading, probability of a positive surgical margin, probability of lymph node invasion (LNI), lymphovascular invasion (LVI), and perineural invasion (pn) in patients with intermediate- and high-risk PCa. Likewise, the rates of nerve sparing procedures were 84.3 vs. 87.4% (p = 0.778) and 61.0% vs. 78.8% (p = 0.211), for intermediate- and high-risk PCa patients undergoing surgery after ≤3 months vs. >3 and <6 months, respectively. In multivariable adjusted analyses, a time to surgery >3 months did not significantly worsen any of the outcome variables in patients with intermediate- or high-risk PCa (all p > 0.05).
Conclusion: A “time-from-biopsy-to-prostatectomy” of >3 and <6 months is neither associated with adverse pathological outcomes nor poorer chances of nerve sparing RP in intermediate- and high-risk PCa patients.
MicroRNAs (miRNAs) have emerged as critical posttranscriptional regulators of the immune system, including function and development of regulatory T (Treg) cells. Although this critical role has been firmly demonstrated through genetic models, key mechanisms of miRNA function in vivo remain elusive. Here, we review the role of miRNAs in Treg cell development and function. In particular, we focus on the question what the study of miRNAs in this context reveals about miRNA biology in general, including context-dependent function and the role of individual targets vs. complex co-targeting networks. In addition, we highlight potential technical pitfalls and state-of-the-art approaches to improve the mechanistic understanding of miRNA biology in a physiological context.
Despite the success of immune checkpoint blockade in cancer, the number of patients that benefit from this revolutionary treatment option remains low. Therefore, efforts are being undertaken to sensitize tumors for immune checkpoint blockade, which includes combining immune checkpoint blocking agents such as anti-PD-1 antibodies with standard of care treatments. Here we report that a combination of chemotherapy (doxorubicin) and immune checkpoint blockade (anti-PD-1 antibodies) induces superior tumor control compared to chemotherapy and immune checkpoint blockade alone in the murine autochthonous polyoma middle T oncogene-driven (PyMT) mammary tumor model. Using whole transcriptome analysis, we identified a set of genes that were upregulated specifically upon chemoimmunotherapy. This gene signature and, more specifically, a condensed four-gene signature predicted favorable survival of human mammary carcinoma patients in the METABRIC cohort. Moreover, PyMT tumors treated with chemoimmunotherapy contained higher levels of cytotoxic lymphocytes, particularly natural killer cells (NK cells). Gene set enrichment analysis and bead-based ELISA measurements revealed increased IL-27 production and signaling in PyMT tumors upon chemoimmunotherapy. Moreover, IL-27 signaling improved NK cell cytotoxicity against PyMT cells in vitro. Taken together, our data support recent clinical observations indicating a benefit of chemoimmunotherapy compared to monotherapy in breast cancer and suggest potential underlying mechanisms.
Although cyclophosphamide (CP) has been used successfully in the clinic for over 50 years, it has so far not been possible to elucidate the mechanism of action and to use it for improvement. This was not possible because the basis of the mechanism of action of CP, which was found by lucky coincidence, is apoptosis, the discovery of which was honored with the Nobel Prize only in 2002. Another reason was that results from cell culture experiments were used to elucidate the mechanism of action, ignoring the fact that in vivo metabolism differs from in vitro conditions. In vitro, toxic acrolein is formed during the formation of the cytotoxic metabolite phosphoreamidemustard (PAM), whereas in vivo proapoptotic hydroxypropanal (HPA) is formed. The CP metabolites formed in sequence 4-hydroxycyclophosphamide (OHCP) are the main cause of toxicity, aldophosphamide (ALDO) is the pharmacologically active metabolite and HPA amplifies the cytotoxic apoptosis initiated by DNA alkylation by PAM. It is shown that toxicity is drastically reduced but anti-tumor activity strongly increased by the formation of ALDO bypassing OHCP. Furthermore, it is shown that the anti-tumor activity against advanced solid P388 tumors that grow on CD2F1 mice is increased by orders of magnitude if DNA damage caused by a modified PAM is poorly repairable. View Full-Text
Motivation: Calculating the magnitude of treatment effects or of differences between two groups is a common task in quantitative science. Standard effect size measures based on differences, such as the commonly used Cohen's, fail to capture the treatment-related effects on the data if the effects were not reflected by the central tendency. The present work aims at (i) developing a non-parametric alternative to Cohen’s d, which (ii) circumvents some of its numerical limitations and (iii) involves obvious changes in the data that do not affect the group means and are therefore not captured by Cohen’s d.
Results: We propose "Impact” as a novel non-parametric measure of effect size obtained as the sum of two separate components and includes (i) a difference-based effect size measure implemented as the change in the central tendency of the group-specific data normalized to pooled variability and (ii) a data distribution shape-based effect size measure implemented as the difference in probability density of the group-specific data. Results obtained on artificial and empirical data showed that “Impact”is superior to Cohen's d by its additional second component in detecting clearly visible effects not reflected in central tendencies. The proposed effect size measure is invariant to the scaling of the data, reflects changes in the central tendency in cases where differences in the shape of probability distributions between subgroups are negligible, but captures changes in probability distributions as effects and is numerically stable even if the variances of the data set or its subgroups disappear.
Conclusions: The proposed effect size measure shares the ability to observe such an effect with machine learning algorithms. Therefore, the proposed effect size measure is particularly well suited for data science and artificial intelligence-based knowledge discovery from big and heterogeneous data.
Background: The currently prevailing global threat of COVID-19 caused the publication numbers on coronaviruses to explode. The awareness of the scientific and public community is enormous. But what about the sense of all these undertakings and what can be learned about the future for a better understanding? These questions were answered with established bibliometric analyses of the time until the avalanche of publications unfolded.
Methods: Chronological, geographical aspects of publication output on coronavirus were also evaluated under the influence of epidemiological and socio-economic parameters.
Results: The trend in publication and citation numbers shows the strong influence of the past pandemics SARS and MERS with an untypical decline afterward. Research is becoming increasingly multidisciplinary over time. The USA and China, as the countries with the highest number of publications, are being displaced by other countries in the consideration of socio-economic and epidemiological aspects, which shows the effect of regional interest in corona research. A significant correlation was found between the number of SARS cases per country and related publications, while no correlation was found for MERS cases and articles.
Conclusions: The results underline the need for sustainable and forward-looking approaches that should not end with the containment of COVID-19.
Objective: To evaluate if 3 peptides derived from the cartilage oligomeric matrix protein (COMP), which wounded zones of cartilage secrete into synovial fluid, possess biological activity and might therefore be involved in the regulation of specific aspects of joint regeneration.
Methods: The 3 peptides were produced by chemical synthesis and then tested in vitro for known functions of the COMP C-terminal domain from which they derive, and which are involved in osteoarthritis: transforming growth factor-β (TGF-β) signaling, vascular homeostasis, and inflammation. Results. None of the peptides affected the gene expression of COMP in osteochondral progenitor cells (P > 0.05). We observed no effects on the vascularization potential of endothelial cells (P > 0.05). In cultured synovium explants, no differences on the expression of catabolic enzymes or proinflammatory cytokines were found when peptides were added (P > 0.05).
Discussion and conclusions: The 3 peptides tested do not regulate TGF-β signaling, angiogenesis and vascular tube formation, or synovial inflammation in vitro and therefore most likely do not play a major role in the disease process.
Background: The number of implantable cardioverter defibrillator (ICD) infections is increasing due to an increased number of ICD implants, higher-risk patients, and more frequent replacement procedures, which carry a higher risk of infection. Reducing the morbidity, mortality, and cost of ICD-related infections requires an understanding of the current rate of this complication and its predictors.
Methods: The Shock Implant Evaluation Trial (SIMPLE) trial randomized 2500 ICD recipients to defibrillation testing or not. Over an average of 3.1 years, patients were seen every 6 months and examined for evidence of ICD infection, which was defined as requiring device removal and/or intravenous antibiotics.
Results: Within 24 months, 21 patients (0.8%) developed infection. Fourteen patients (67%) with infection presented within 30 days, 20 patients by 12 months, and only 1 patient beyond 12 months. Univariate analysis demonstrated that patients with primary electrical disorders (3 patients, P = 0.009) and those with a secondary prevention indication (13 patients, P = 0.0009) were more likely to develop infection. Among the 2.2% of patients who developed an ICD wound hematoma, 10.4% developed an infection. Among the 8.3% of patients requiring an ICD reintervention, 1.9% developed an infection.
Conclusions: This cohort of ICD recipients at high-volume centres have a low risk of device-related infection. However; strategies to reduce wound hematoma and the need for ICD reintervention could further reduce the rate of infection.
Chronische pulmonale Infektionen mit Pseudomonas aeruginosa (PA) betreffen die überwiegende Mehrheit der erwachsenen Mukoviszidose (Cystische Fibrose, CF) Patienten.
Diese Infektionen führen gesichert zu einer Abnahme der Lungenfunktion und Zunahme der Mortalität der Patienten. Atemwegsviren stehen im Verdacht pulmonale Exazerbationen bei CF-Patienten auszulösen. Unklar ist jedoch, welchen Einfluss eine chronische Infektion mit PA auf die Anfälligkeit und Reaktion des Atemwegsepithels auf virale Infektionen hat.
Das Ziel dieser Arbeit war es daher, die Interaktionen zwischen PA, humanen Rhinoviren (HRV) und primären bronchialen Epithelzellen zu untersuchen. Hierfür wurden Zellen von jeweils drei Patienten mit CF und mit Lungenemphysem aus Lungenexplantaten isoliert und in einem speziellen Air- Liquid-Interface Zellkulturmodell zu einem mukoziliär differenzierten mehrreihigen Flimmerepithel kultiviert. Chronische Infektionen wurden mit klinischen PA Isolaten für einen Gesamtzeitraum von 16 Tagen durchgeführt. Anschließend wurden die Zellen mit HRV infiziert. Schlüsselzytokine, Interferone und virale RNA wurden mittels Cytometric bead array, ELISA und qPCR bestimmt.
Rein virale Infektionen mit HRV führten zu einem Anstieg von IL-1, -6, -8, TNF- α, IP10 und IFN-b, IFN-l1 sowie ISGs und in ähnlichem Ausmaß konnte dies auch bei Coinfektionen mit einem mukoiden PA-Isolat beobachtet werden. Coinfektionen mit einem nicht-mukoiden PA-Isolat führten im Vergleich zu rein viralen Infektionen zu vermehrter Expression von IL-1β und IL-6 mRNA. Während es unter diesen Bedingungen auch auf Proteinebene zu einem Anstieg der IL-1β Konzentration kam, lag die Konzentration von freiem IL-6 Protein in nahezu allen Proben unter der Nachweisgrenze. Zellkulturmedium aus Coinfektionen mit diesem nicht-mukoiden PA-Isolat führten zudem zu einem Abbau oder einer Bindung von extern zugegebenen rekombinantem IL-6.
IL-8, IP-10, TNF-α Protein und mRNA von IFN-β, -λ1 und ISGs, sowie die Viruslast waren vergleichbar zwischen rein viralen Infektionen und bakteriell- viralen Coinfektionen. Ebenfalls keine Unterschiede wurden zwischen Zellen von Emphysem und CF-Spendern gefunden. Insgesamt zeigen diese Daten, dass eine PA-Infektion die Antwort differenzierter bronchialer Epithelzellen auf eine Virusinfektion verändern kann. Die hierdurch veränderte Immunantwort und möglicherweise eingeschränkten epithelialen Reparaturmechanismen könnten eine Ursache aggravierter viraler Infektionen in P. aeruginosa-infizierten Atemwegen darstellen.
Ein besseres Verständnis der Interaktionen zwischen chronisch-bakteriellen und viralen Atemwegsinfektionen könnte potenziell die Behandlung virus-induzierter Exazerbationen bei PA-infizierten CF-Patienten verbessern.
Spinocerebellar ataxia type 2 (SCA2) is caused by polyglutamine expansion in Ataxin-2 (ATXN2). This factor binds RNA/proteins to modify metabolism after stress, and to control calcium (Ca2+) homeostasis after stimuli. Cerebellar ataxias and corticospinal motor neuron degeneration are determined by gain/loss in ATXN2 function, so we aimed to identify key molecules in this atrophic process, as potential disease progression markers. Our Atxn2-CAG100-Knock-In mouse faithfully models features observed in patients at pre-onset, early and terminal stages. Here, its cerebellar global RNA profiling revealed downregulation of signaling cascades to precede motor deficits. Validation work at mRNA/protein level defined alterations that were independent of constant physiological ATXN2 functions, but specific for RNA/aggregation toxicity, and progressive across the short lifespan. The earliest changes were detected at three months among Ca2+ channels/transporters (Itpr1, Ryr3, Atp2a2, Atp2a3, Trpc3), IP3 metabolism (Plcg1, Inpp5a, Itpka), and Ca2+-Calmodulin dependent kinases (Camk2a, Camk4). CaMKIV–Sam68 control over alternative splicing of Nrxn1, an adhesion component of glutamatergic synapses between granule and Purkinje neurons, was found to be affected. Systematic screening of pre/post-synapse components, with dendrite morphology assessment, suggested early impairment of CamKIIα abundance together with the weakening of parallel fiber connectivity. These data reveal molecular changes due to ATXN2 pathology, primarily impacting excitability and communication.
Lichen-forming fungi are symbiotic organisms that synthesize unique natural products with potential for new drug leads. Here, we explored the pharmacological activity of six lichen extracts (Evernia prunastri, Pseudevernia furfuracea, Umbilicaria pustulata, Umbilicaria crustulosa, Flavoparmelia caperata, Platismatia glauca) in the context of cancer and inflammation using a comprehensive set of 11 functional and biochemical in vitro screening assays. We assayed intracellular Ca2+ levels and cell migration. For cancer, we measured tumor cell proliferation, cell cycle distribution and apoptosis, as well as the angiogenesis-associated proliferation of endothelial cells (ECs). Targeting inflammation, we assayed leukocyte adhesion onto ECs, EC adhesion molecule expression, as well as nitric oxide production and prostaglandin (PG)E2 synthesis in leukocytes. Remarkably, none of the lichen extracts showed any detrimental influence on the viability of ECs. We showed for the first time that extracts of F. caperata induce Ca2+ signaling. Furthermore, extracts from E. prunastri, P. furfuracea, F. caperata, and P. glauca reduced cell migration. Interestingly, F. caperata extracts strongly decreased tumor cell survival. The proliferation of ECs was significantly reduced by E. prunastri, P. furfuracea, and F. caperata extracts. The extracts did not inhibit the activity of inflammatory processes in ECs. However, the pro-inflammatory activation of leukocytes was inhibited by extracts from E. prunastri, P. furfuracea, F. caperata, and P. glauca. After revealing the potential biological activities of lichen extracts by an array of screening tests, a correlation analysis was performed to evaluate particular roles of abundant lichen secondary metabolites, such as atranorin, physodic acid, and protocetraric acid as well as usnic acid in various combinations. Overall, some of the lichen extracts tested in this study exhibit significant pharmacological activity in the context of inflammation and/or cancer, indicating that the group lichen-forming fungi includes promising members for further testing.
Nitro fatty acids (NFAs) are endogenously generated lipid mediators deriving from reactions of unsaturated electrophilic fatty acids with reactive nitrogen species. Furthermore, Mediterranean diets can be a source of NFA. These highly electrophilic fatty acids can undergo Michael addition reaction with cysteine residues, leading to post-translational modifications (PTM) of selected regulatory proteins. Such modifications are capable of changing target protein function during cell signaling or in biosynthetic pathways. NFA target proteins include the peroxisome proliferator-activated receptor γ (PPAR-γ), the pro-inflammatory and tumorigenic nuclear factor-κB (NF-κB) signaling pathway, the pro-inflammatory 5-lipoxygenases (5-LO) biosynthesis pathway as well as soluble epoxide hydrolase (sEH), which is essentially involved in the regulation of vascular tone. In several animal models of inflammation and cancer, the therapeutic efficacy of well-tolerated NFA has been demonstrated. This has already led to clinical phase II studies investigating possible therapeutic effects of NFA in subjects with pulmonary arterial hypertension. Albeit Michael acceptors feature a broad spectrum of bioactivity, they have for a rather long time been avoided as drug candidates owing to their presumed unselective reactivity and toxicity. However, targeted covalent modification of regulatory proteins by Michael acceptors became recognized as a promising approach to drug discovery with the recent FDA approvals of the cancer therapeutics, afatanib (2013), ibrutinib (2013), and osimertinib (2015). Furthermore, the Michael acceptor, neratinib, a dual inhibitor of the human epidermal growth factor receptor 2 and epidermal growth factor receptor, was recently approved by the FDA (2017) and by the EMA (2018) for the treatment of breast cancer. Finally, a number of further Michael acceptor drug candidates are currently under clinical investigation for pharmacotherapy of inflammation and cancer. In this review, we focus on the pharmacology of NFA and other Michael acceptor drugs, summarizing their potential as an emerging class of future antiphlogistics and adjuvant in tumor therapeutics.
Post-exercise hypotension (PEH) is the phenomenon of lowered blood pressure after a single bout of exercise. Only a fraction of people develops PEH but its occurrence correlates well with long-term effects of sports on blood pressure. Therefore, PEH has been suggested as a suitable predictor for the effectivity of exercise as therapy in hypertension. Local vascular bioactive lipids might play a potential role in this context. We performed a cross-over clinical pilot study with 18 healthy volunteers to investigate the occurrence of PEH after a single short-term endurance exercise. Furthermore, we investigated the plasma lipid profile with focus on arachidonic acid (AA)-derived metabolites as potential biomarkers of PEH. A single bout of ergometer cycling induced a significant PEH in healthy volunteers with the expected high inter-individual variability. Targeted lipid spectrum analysis revealed significant upregulation of several lipids in the direct post-exercise phase. Among these changes, only 15- hydroxyeicosatetranoic acid (HETE) correlated significantly with the extent of PEH but in an AA-independent manner, suggesting that 15-HETE might act as specific PEH-marker. Our data indicate that specific lipid modulation might facilitate the identification of patients who will benefit from exercise activity in hypertension therapy. However, larger trials including hypertonic patients are necessary to verify the clinical value of this hypothesis.
The risk of increasing dengue (DEN) and chikungunya (CHIK) epidemics impacts 240 million people, health systems, and the economy in the Hindu Kush Himalayan (HKH) region. The aim of this systematic review is to monitor trends in the distribution and spread of DEN/CHIK over time and geographically for future reliable vector and disease control in the HKH region. We conducted a systematic review of the literature on the spatiotemporal distribution of DEN/CHIK in HKH published up to 23 January 2020, following Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. In total, we found 61 articles that focused on the spatial and temporal distribution of 72,715 DEN and 2334 CHIK cases in the HKH region from 1951 to 2020. DEN incidence occurs in seven HKH countries, i.e., India, Nepal, Bhutan, Pakistan, Bangladesh, Afghanistan, and Myanmar, and CHIK occurs in four HKH countries, i.e., India, Nepal, Bhutan, and Myanmar, out of eight HKH countries. DEN is highly seasonal and starts with the onset of the monsoon (July in India and June in Nepal) and with the onset of spring (May in Bhutan) and peaks in the postmonsoon season (September to November). This current trend of increasing numbers of both diseases in many countries of the HKH region requires coordination of response efforts to prevent and control the future expansion of those vector-borne diseases to nonendemic areas, across national borders.
Background: While swallowing disorders are frequent sequela following posterior fossa tumor (PFT) surgery in children, data on dysphagia frequency, severity, and outcome in adults are lacking. The aim of this study was to investigate dysphagia before and after surgical removal of PFT. Additionally, we tried to identify clinical predictors for postsurgical swallowing disorders. Furthermore, this study explored the three-month outcome of dysphagic patients.
Methods: In a cohort of patients undergoing PFT surgery, dysphagia was prospectively assessed pre- and postoperatively using fiberoptic endoscopic evaluation of swallowing. Patients with severe dysphagia at discharge were re-evaluated after three months. Additionally, clinical and imaging data were collected to identify predictors for post-surgical dysphagia. Results: We included 26 patients of whom 15 had pre-operative swallowing disorders. After surgery, worsening of pre-existing dysphagia could be noticed in 7 patients whereas improvement was observed in 2 and full recovery in 3 subjects. New-onset dysphagia after surgery occurred in a minority of 3 cases. Postoperatively, 47% of dysphagic patients required nasogastric tube feeding. Re-evaluation after three months of follow-up revealed that all dysphagic patients had returned to full oral intake.
Conclusion: Dysphagia is a frequent finding in patients with PFT already before surgery. Surgical intervention can infer a deterioration of impaired swallowing function placing affected patients at temporary risk for aspiration. In contrast, surgery can also accomplish beneficial results resulting in both improvement and full recovery. Overall, our findings show the need of early dysphagia assessment to define the safest feeding route for the patient.
Background:Aedes aegypti is a potential vector for several arboviruses including dengue and Zika viruses. The species seems to be restricted to subtropical/tropical habitats and has difficulties in establishing permanent populations in southern Europe, probably due to constraints during the winter season. The aim of this study was to systematically analyze the cold tolerance (CT) of Ae. aegypti in its most cold-resistant life stage, the eggs.
Methods: The CT of Ae. aegypti eggs was compared with that of Ae. albopictus which is well established in large parts of Europe. By systematically studying the literature (meta-analysis), we recognized that CT has been rarely tested in Ae. aegypti eggs, but eggs can survive at zero and sub-zero temperatures for certain exposure periods. To overcome potential bias from experimental differences between studies, we then conducted species comparisons using a harmonized high-resolution CT measuring method. From subtropical populations of the same origin, the survival (hatching in %) and emergence of adults of both species were measured after zero and sub-zero temperature exposures for up to 9 days (3 °C, 0 °C and − 2 °C: ≤ 9 days; − 6 °C: ≤ 2 days).
Results: Our data show that Ae. aegypti eggs can survive low and sub-zero temperatures for a short time period similar to or even better than those of Ae. albopictus. Moreover, after short sub-zero exposures of eggs of both species, individuals still developed into viable adults (Ae. aegypti: 3 adults emerged after 6 days at − 2 °C, Ae. albopictus: 1 adult emerged after 1 day at − 6 °C).
Conclusions: Thus, both the literature and the present experimental data indicate that a cold winter may not be the preventing factor for the re-establishment of the dengue vector Ae. aegypti in southern Europe.
The inflammatory response plays an important role in the pathophysiology of multiple injuries. This study examines the effects of severe trauma and inflammatory response on markers of neuronal damage. A retrospective analysis of prospectively collected data in 445 trauma patients (Injury Severity Score (ISS) ≥ 16) is provided. Levels of neuronal biomarkers (calcium-binding Protein B (S100b), Enolase2 (NSE), glial fibrillary acidic protein (GFAP)) and Interleukins (IL-6, IL-10) in severely injured patients (with polytrauma (PT)) without traumatic brain injury (TBI) or with severe TBI (PT+TBI) and patients with isolated TBI (isTBI) were measured upon arrival until day 5. S100b, NSE, GFAP levels showed a time-dependent decrease in all cohorts. Their expression was higher after multiple injuries (p = 0.038) comparing isTBI. Positive correlation of marker level after concomitant TBI and isTBI (p = 0.001) was noted, while marker expression after PT appears to be independent. Highest levels of IL-6 and -10 were associated to PT und lowest to isTBI (p < 0.001). In all groups pro-inflammatory response (IL-6/-10 ratio) peaked on day 2 and at a lower level on day 4. Severe TBI modulates kinetic profile of inflammatory response by reducing interleukin expression following trauma. Potential markers for neuronal damage have a limited diagnostic value after severe trauma because undifferentiated increase.
Stellenwert der Teststreifen-basierten Analyse der INR für die Behandlung von Blutungskomplikationen
(2020)
Das Ziel der hier vorliegenden Studie war es einen Zusammenhang zwischen den Ergebnissen von konventioneller versus Teststreifen-basierter INR-Messung zu untersuchen und die Analysedauern der beiden Methoden zu vergleichen. Wir haben in dieser prospektiven Mono-Center Studie 24 hämorrhagische Patienten und Patientinnen inkludiert und aus infrastrukturellen Gesichtspunkten in zwei Gruppenkollektive aufgeteilt. Das eine Studienkollektiv bildeten 12 hämorrhagische Patientinnen der Klinik für Gynäkologie und Geburtshilfe des Universitätsklinikums Frankfurt. Die Blutproben dieser Patientinnen wurden mittels einem personengebundenen Transportdienst in das Zentrallabor der Universitätsklinik geliefert. Das zweite Gruppenkollektiv bildeten 12 Patienten aus dem Schockraum der zentralen Notaufnahme. Die Blutproben dieses Kollektivs wurden mittels Rohrpost direkt in das Zentrallabor übermittelt. Wir untersuchten mittels konventioneller Gerinnungsdiagnostik und mittels Teststreifen-basierter POC-Diagnostik (CoaguChek II Pro®, PT Test, Roche Diagnostics AG) die INR eines jeden Patienten. Zudem erfolgte die Erfassung von Transport- und Analysedauer. Für die Auswertung der Daten errechneten wir die Spearman-Korrelationskoeffizienten sowohl auf Gruppenebene als auch für das Gesamtkollektiv und führten eine Bland-Altman Analyse zum direkten Methodenvergleich durch.
Es zeigte sich, dass die mittels POCT ermittelte INR im Gesamtkollektiv signifikant mit den im Zentrallabor gemessenen Werten korreliert (r=0,79). Auch auf Gruppenebene zeigte sich in Gruppe 1 (Schockraum) r=0,91 und in Gruppe 2 (Kreißsaal) r=0,83 eine signifikante Korrelation. Die Bland-Altmann Analyse ergab, dass die Ergebnisse der Teststreifen-basierten POC-Methode um 0,082 (SD±0,19) niedriger waren als die Ergebnisse der konventionellen Gerinnungstests. Die Untersuchung der Analyse- und Transportzeiten brachte hervor, dass die Bereitstellungsdauer der POC-Messmethode signifikant kürzer war (2 (1,04/2,85) Minuten) als die Dauer bis zur elektronischen Ergebnisbereitstellung nach laboranalytischen Untersuchungen (58,2 (38,28/88) Minuten). Es ergab sich zudem, dass die Transportdauer mittels Rohrpost mit 8 (3,25/10,1) Minuten signifikant kürzer war als die des personengebundenen Transportdienstes 18,5 (14,5/33) Minuten (p<0,001).Die in der Studie ermittelten konsistenten Ergebnisse lassen vermuten, dass Teststreifen-basierte Systeme als Methoden zur Notfalldiagnostik hämorrhagischer Patienten geeignet sein können, weil ihre Messergebnisse verglichen mit der klassischen Gerinnungsdiagnostik im Zentrallabor deutlich schneller und mit vergleichbarer Ergebnisqualität vorliegen. Die Teststreifen-basierten Methoden können als diagnostische Elemente in Hämotherapie-Algorithmen eingesetzt werden und dazu beitragen, eine zeitnahe und zielgerichtete Hämotherapie umzusetzen, die sich positiv auf das klinische Ergebnis der Patienten auswirken kann.
Beyond their role in pathogen recognition and the initiation of immune defense, Toll-like receptors (TLRs) are known to be involved in various vascular processes in health and disease. We investigated the potential of the lipopeptide and TLR2/6 ligand macrophage activating protein of 2-kDA (MALP-2) to promote blood flow recovery in mice. Hypercholesterolemic apolipoprotein E (Apoe)-deficient mice were subjected to microsurgical ligation of the femoral artery. MALP-2 significantly improved blood flow recovery at early time points (three and seven days), as assessed by repeated laser speckle imaging, and increased the growth of pre-existing collateral arteries in the upper hind limb, along with intimal endothelial cell proliferation in the collateral wall and pericollateral macrophage accumulation. In addition, MALP-2 increased capillary density in the lower hind limb. MALP-2 enhanced endothelial nitric oxide synthase (eNOS) phosphorylation and nitric oxide (NO) release from endothelial cells and improved the experimental vasorelaxation of mesenteric arteries ex vivo. In vitro, MALP-2 led to the up-regulated expression of major endothelial adhesion molecules as well as their leukocyte integrin receptors and consequently enhanced the endothelial adhesion of leukocytes. Using the experimental approach of femoral artery ligation (FAL), we achieved promising results with MALP-2 to promote peripheral blood flow recovery by collateral artery growth.
Background: Chronic hepatitis C virus (HCV) infections are causally linked with metabolic comorbidities such as insulin resistance, hepatic steatosis, and dyslipidemia. However, the clinical impact of HCV eradication achieved by direct-acting antivirals (DAAs) on glucose and lipid homeostasis is still controversial. The study aimed to prospectively investigate whether antiviral therapy of HCV with DAAs alters glucose and lipid parameters. Methods: 50 patients with chronic HCV who were treated with DAAs were screened, and 49 were enrolled in the study. Biochemical and virological data, as well as noninvasive liver fibrosis parameters, were prospectively collected at baseline, at the end of treatment (EOT) and 12 and 24 weeks post-treatment. Results: 45 of 46 patients achieved sustained virologic response (SVR). The prevalence of insulin resistance (HOMA-IR) after HCV clearance was significantly lower, compared to baseline (5.3 ± 6.1 to 2.5 ± 1.9, p < 0.001), which is primarily attributable to a significant decrease of fasting insulin levels (18.9 ± 17.3 to 11.7 ± 8.7; p = 0.002). In contrast to that, HCV eradication resulted in a significant increase in cholesterol levels (total cholesterol, low-density lipoprotein cholesterol (LDL-C), and high-density lipoprotein (HDL-C) levels) and Controlled Attenuated Score (CAP), although BMI did not significantly change over time (p = 0.95). Moreover, HOMA-IR correlated significantly with noninvasive liver fibrosis measurements at baseline und during follow-up (TE: r = 0.45; p = 0.003, pSWE: r = 0.35; p = 0.02, APRI: r = 0.44; p = 0.003, FIB-4: r = 0.41; p < 0.001). Conclusion: Viral eradication following DAA therapy may have beneficial effects on glucose homeostasis, whereas lipid profile seems to be worsened.