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Institute
There is ample epidemiologic evidence for an association of chronic hepatitis C virus (HCV) infection with B-cell non-Hodgkin lymphoma (B-NHL). B-NHL subtypes most frequently associated with HCV are marginal zone lymphoma and diffuse large B-cell lymphoma. The most convincing evidence for a causal relationship between HCV infection and lymphoma development is the observation of B-NHL regression after HCV eradication by antiviral therapy (AVT). In fact, for indolent HCV-associated B-NHL, first-line AVT instead of standard immune-chemotherapy might be considered. Molecular mechanisms of HCV-NHL development are still poorly understood. Three general theories have emerged to understand the HCV-induced lymphomagenesis: (1) continuous external stimulation of lymphocyte receptors by viral antigens and consecutive proliferation; (2) HCV replication in B cells with oncogenic effect mediated by intracellular viral proteins; (3) permanent B-cell damage, e.g., mutation of tumor suppressor genes, caused by a transiently intracellular virus (“hit and run” theory). This review systematically summarizes the data on epidemiology, interventional studies, and molecular mechanisms of HCV-associated B-NHL.
The PI3K/mammalian Target of Rapamycin (mTOR) pathway is often aberrantly activated in rhabdomyosarcoma (RMS) and represents a promising therapeutic target. Recent evaluation of AZD8055, an ATP-competitive mTOR inhibitor, by the Preclinical Pediatric Testing Program showed in vivo antitumor activity against childhood solid tumors, including RMS. Therefore, in the present study, we searched for AZD8055-based combination therapies. Here, we identify a new synergistic lethality of AZD8055 together with ABT-737, a BH3 mimetic that antagonizes Bcl-2, Bcl-xL, and Bcl-w but not Mcl-1. AZD8055 and ABT-737 cooperate to induce apoptosis in alveolar and embryonal RMS cells in a highly synergistic fashion (combination index < 0.2). Synergistic induction of apoptosis by AZD8055 and ABT-737 is confirmed on the molecular level, as AZD8055 and ABT-737 cooperate to trigger loss of mitochondrial membrane potential, activation of caspases, and caspase-dependent apoptosis that is blocked by the pan-caspase inhibitor Z-VAD-fmk. Similar to AZD8055, the PI3K/mTOR inhibitor NVP-BEZ235, the PI3K inhibitor NVP-BKM120 and Akt inhibitor synergize with ABT-737 to trigger apoptosis, whereas no cooperativity is found for the mTOR complex 1 inhibitor RAD001. Interestingly, molecular studies reveal a correlation between the ability of different PI3K/mTOR inhibitors to potentiate ABT-737-induced apoptosis and to suppress Mcl-1 protein levels. Importantly, knockdown of Mcl-1 increases ABT-737-induced apoptosis similar to AZD8055/ABT-737 cotreatment. This indicates that AZD8055-mediated suppression of Mcl-1 protein plays an important role in the synergistic drug interaction. By identifying a novel synergistic interaction of AZD8055 and ABT-737, our findings have important implications for the development of molecular targeted therapies for RMS.
Many snake venoms are known for their antithrombotic activity. They contain components that specifically target different platelet-activating receptors such as the collagen-binding integrin α2β1 and the von Willebrand factor receptor GPIb. In a search for an α2β1 integrin-blocking component from the venom of the habu snake (Trimeresurus flavoviridis), we employed two independent purification protocols. First, we used the integrin α2A domain, a major collagen-binding domain, as bait for affinity purification of an α2β1 integrin-binding toxin from the crude venom. Second, in parallel, we used classical protein separation protocols and tested for α2β1 integrin-inhibiting capabilities by ELISA. Using both approaches, we identified flavocetin-A as an inhibitor of α2β1 integrin. Hitherto, flavocetin-A has been reported as a GPIb inhibitor. However, flavocetin-A inhibited collagen-induced platelet aggregation even after GPIb was blocked with other inhibitors. Moreover, flavocetin-A antagonized α2β1 integrin-mediated adhesion and migration of HT1080 human fibrosarcoma cells, which lack any GPIb, on collagen. Protein chemical analyses proved that flavocetin-A binds to α2β1 integrin and its α2A domain with high affinity and in a cooperative manner, which most likely is due to its quaternary structure. Kinetic measurements confirmed the formation of a strong complex between integrin and flavocetin-A, which dissociates very slowly. This study proves that flavocetin-A, which has long been known as a GPIb inhibitor, efficiently targets α2β1 integrin and thus blocks collagen-induced platelet activation. Moreover, our findings suggest that the separation of GPIb- and α2β1 integrin-blocking members within the C-type lectin-related protein family is less strict than previously assumed.
Cellular cytotoxicity is the hallmark of NK cells mediating both elimination of virus-infected or malignant cells, and modulation of immune responses. NK cytotoxicity is triggered upon ligation of various activating NK cell receptors. Among these is the C-type lectin-like receptor NKp80 which is encoded in the human Natural Killer Gene Complex (NKC) adjacent to its ligand, activation-induced C-type lectin (AICL). NKp80-AICL interaction promotes cytolysis of malignant myeloid cells, but also stimulates the mutual crosstalk between NK cells and monocytes.
While many activating NK cell receptors pair with ITAM-bearing adaptors, we recently reported that NKp80 signals via a hemITAM-like sequence in its cytoplasmic domain. Here we molecularly dissect the NKp80 hemITAM and demonstrate that two non-consensus amino acids, in particular arginine 6, critically impair both hemITAM phosphorylation and Syk recruitment. Impaired Syk recruitment results in a substantial attenuation of cytotoxic responses upon NKp80 ligation. Reconstituting the hemITAM consensus or Syk overexpression resulted in robust NKp80-mediated responsiveness. Collectively, our data provide a molecular rationale for the restrained activation potential of NKp80 and illustrate how subtle alterations in signaling motifs determine subsequent cellular responses. They also suggest that non-consensus alterations in the NKp80 hemITAM, as commonly present among mammalian NKp80 sequences, may have evolved to dampen NKp80-mediated cytotoxic responses toward AICL-expressing cells.
Background: The activating NK receptor NKp80 triggers cytotoxicity by human NK cells via a cytoplasmic hemITAM sequence.
Results: A non-consensus hemITAM residue impairs the capacity of NKp80 to recruit Syk kinase and to trigger cytotoxicity.
Conclusion: Unlike typical hemITAM receptors, NKp80 does not efficiently recruit Syk kinase resulting in attenuated effector responses.
Significance: An attenuated cytotoxic responsiveness critically impacts on the immunomodulatory function of NKp80.
Characteristically, most solid tumors exhibit an increased tumor interstitial fluid pressure (TIFP) that directly contributes to the lowered uptake of macromolecular therapeutics into the tumor interstitium. Abnormalities in the tumor-associated lymph vessels are a central brick in the development and prolonged sustaining of an increased TIFP. In the current study, vascular endothelial growth factor C (VEGF-C) was used to enhance tumor-associated lymphangiogenesis as a new mechanism to actively reduce the TIFP by increased lymphatic drainage of the tumor tissue. Human A431 epidermoid vulva carcinoma cells were inoculated in NMRI nu/nu mice to generate a xenograft mouse model. Seven days after tumor cell injection, VEGF-C was peritumorally injected to induce lymphangiogenesis. Tumor growth and TIFP was lowered significantly over time in VEGF-C-treated tumors in comparison to control or VEGF-A-treated animals. These data demonstrate for the first time that actively induced lymphangiogenesis can lower the TIFP in a xenograft tumor model and apparently reduce tumor growth. This model represents a novel approach to modulate biomechanical properties of the tumor interstitium enabling a lowering of TIFP in vivo.
Novel treatment options are needed for the successful therapy of patients with high-risk neuroblastoma. Here, we investigated the cyclin-dependent kinase (CDK) inhibitor SNS-032 in a panel of 109 neuroblastoma cell lines consisting of 19 parental cell lines and 90 sublines with acquired resistance to 14 different anticancer drugs. Seventy-three percent of the investigated neuroblastoma cell lines and all four investigated primary tumor samples displayed concentrations that reduce cell viability by 50% in the range of the therapeutic plasma levels reported for SNS-032 (<754 nM). Sixty-two percent of the cell lines and two of the primary samples displayed concentrations that reduce cell viability by 90% in this concentration range. SNS-032 also impaired the growth of the multidrug-resistant cisplatin-adapted UKF-NB-3 subline UKF-NB-3rCDDP1000 in mice. ABCB1 expression (but not ABCG2 expression) conferred resistance to SNS-032. The antineuroblastoma effects of SNS-032 did not depend on functional p53. The antineuroblastoma mechanism of SNS-032 included CDK7 and CDK9 inhibition-mediated suppression of RNA synthesis and subsequent depletion of antiapoptotic proteins with a fast turnover rate including X-linked inhibitor of apoptosis (XIAP), myeloid cell leukemia sequence 1 (Mcl-1), baculoviral IAP repeat containing 2 (BIRC2; cIAP-1), and survivin. In conclusion, CDK7 and CDK9 represent promising drug targets and SNS-032 represents a potential treatment option for neuroblastoma including therapy-refractory cases.
The antineoplastic alkaloid ellipticine is a prodrug, the pharmacological efficiency of which is dependent on its cytochrome P450 (CYP)- and/or peroxidase-mediated activation to species forming DNA adducts in target tissues. Here, we found that this compound is cytotoxic to human BHT-101, B-CPAP and 8505-C thyroid cancer cells and blocks one or more phases of cell cycle in these cancer cells. Ellipticine toxicity to the thyroid cancer cells corresponded to levels of DNA adducts generated by the CYP- and/or peroxidase-mediated ellipticine metabolites, 12-hydroxy- and 13-hydroxyellipticine, in these cells. Cultivation of all tested cells under hypoxic conditions (1 % oxygen) led to a decrease in ellipticine toxicity. Such a lower sensitivity of cells to ellipticine correlates with a decrease in the formation of ellipticine-derived DNA adducts in these cells. Using Western blotting, the expression of CYP1A1, 1B1, 3A4, thyroid peroxidase (TPO), cyclooxygenase-1 (COX-1) and cytochrome b5, the enzymes that catalyze, and/or influence ellipticine metabolism, was investigated in the cancer cells. Furthermore, the effects of ellipticine treatment on the expression levels of these proteins in thyroid cancer cells were also examined. The results indicate that the highest expression levels of cytochrome b5 together with CYP1A1 and 3A4 determine the highest DNA adduct formation and cytotoxicity of ellipticine in B-CPAP cells. They also demonstrate that formation of covalent DNA adducts by ellipticine is the predominant mechanism responsible for its cytotoxicity in studied cells.
The proportion of elderly women in the population is rising, and in tandem, the incidence of breast cancer rises with age. Because of health and tolerability concerns, as well as life expectancy, physicians may be reluctant to advise a standard treatment regimen for elderly patients with metastatic breast cancer. To elucidate this issue, we performed a literature review of clinical studies that included women with metastatic breast cancer who were over the age of 65. Our results show that although little clinical evidence exists, what is available suggests that standard treatment is tolerated and beneficial for patients meeting certain criteria. A geriatric assessment may identify specific patient groups (independent, dependent, or frail) and thereby guide treatment. Treatment recommendations for elderly patients with metastatic breast cancer are sparse, although first-line endocrine treatment, usually aromatase inhibitors or tamoxifen, is recommended for hormone-sensitive disease. In general, the evidence from clinical studies suggests that aromatase inhibitors are more effective than either tamoxifen or megestrol acetate as first- or second-line treatment in postmenopausal women with metastatic breast cancer. Ultimately, quality of life, treatment effects, and comorbidities are important aspects in this population and may guide treatment choice. To provide evidence-based treatment guidance, future clinical trials should include more patients over the age of 65 years.
In the stomach, neoplastic lesions often arise in the setting of precursor conditions such as gastritis, intestinal metaplasia, or adenomatous lesions. Biopsies may, therefore, underestimate disease severity or even miss the diagnosis (sampling error). Endomicroscopy is able to visualize typical features of such pathologies. It enables in vivo microscopy of gastritis with definition of enhanced vascularity and vascular leakage, but the typical cobblestone appearance of the gastric mucosa is preserved. The presence of intestinal metaplasia is confirmed by columnar absorptive cells with brush border and goblet cells within villiform foveolar epithelium. Gastric neoplasia is characterized by crowded glands with intraluminal folding and glandular budding and branching accompanied by increased density of dilated and distorted capillaries. Finally, in gastric cancer, gland and overall mucosal architecture is progressively lost. These features are shown side by side with white-light endoscopic findings. Endomicroscopy is used in such a setting to rapidly screen larger areas (optical biopsies) and subsequently target tissue sampling to areas with highly suspicious microscopic patterns. In experienced hands, it therefore constitutes an important part especially in the presence of neoplastic lesions within noncircumscript gastric premalignant conditions. This article is part of an expert video encyclopedia.
Stent insertion is an established technique of endoscopic retrograde cholangiopancreatography (ERCP) to treat symptomatic malignant or benign biliary strictures, and stent placement is accomplished by using the over-the-wire (OTW) method. In some cases, however, it might be challenging and sometimes time consuming to pass a complex biliary stricture with the guidewire. Stent-exchange technique with a guidewire left in place during stent removal might therefore be helpful to guarantee successful and time-sparing interventions.
A simple method is presented to remove the stent with the guidewire left in place, using the OTW stent-exchange method in ERCP. This technique simplifies stent OTW exchange by using a simple endoscopy snare. This article is part of an expert video encyclopedia.
Dieulafoy's lesion (DL) is a rare source of gastrointestinal tract bleeding that may occur at any site in the gastrointestinal tract and may be difficult to detect by endoscopy. DL is characterized by a large, tortuous arteriole in the submucosa. This is a case of duodenal DL that is detected and treated by endoscopy. This article is part of an expert video encyclopedia.
This is the case report of a 58-year-old male patient who presented with recurring abdominal pain of 4 months duration. He had undergone multiple investigations including upper and lower gastrointestinal tract endoscopies and diagnostic laparoscopy, but there were no significant findings detected.
Capsule endoscopy revealed a submucosal small bowel tumor that was suspected to originate from the distal third of the small bowel. Surgery was indicated and a highly differentiated neuroendocrine tumor was found at laparotomy at the distal ileum. An ileocecal resection was performed confirming a neuroendocrine tumor of the small bowel (G2T2N1M1). This article is part of an expert video encyclopedia.
A rare cause of recurrent melena was identified by capsule endoscopy: arteriovenous malformation
(2013)
Small bowel endoscopy is indicated for patients with an unidentified bleeding site in esophagogastroduodenoscopy and ileocolonoscopy and symptoms of intestinal blood loss or unexplained anemia. In approximately two-thirds of these cases, capsule endoscopy (CE) detects a lesion within the small bowel that explains the patient's symptoms.
The case of an 80-year-old female patient with recurrent melena and anemia is presented here by the authors. Endoscopy of the upper gastrointestinal tract as well as ileocolonoscopy did not show any pathological findings. CE revealed an area with abnormal mucosa in the middle third of the small bowel, which was strongly suspected of having malignant origin. Surgical exploration led to resection of a small jejunal segment with a palpable mass and increased blood flow. Surprisingly, the final diagnosis determined by the pathologist was arteriovenous malformation (AVM). This article is part of an expert video encyclopedia.
The author presents the case of a patient with severe bleeding from a duodenal ulcer that could not be controlled by endoscopic application of metal clips and injection of fibrin glue. Angiographic embolization with placement of coils into the feeding vessel stopped the bleeding. However, 3 days later, a fistula emerged from coil material penetrating into the dorsal duodenum and a peritoneal leakage developed. The fistula was completely closed by placing an over-the-scope clip on the enteral opening of the fistula. This article is part of an expert video encyclopedia.
Small bowel varices may be found in less than 5% of patients with suspected small bowel bleeding. These varices are associated with portal hypertension or thrombosis of mesenteric venous vessels and with altered abdominal vascular anatomy with or without prior small bowel surgery. In bleeding small bowel varices, therapeutic options include endoscopic injection of tissue adhesives, endovascular approaches such as balloon-occluded retrograde transvenous or percutaneous obliteration and transjugular intrahepatic portosystemic shunt, and surgical resection. This is a case report of a 53-year-old patient with ethylic liver cirrhosis who presented with severe, life-threatening hematochezia due to small bowel varices. This article is part of an expert video encyclopedia.
Peutz–Jeghers syndrome (PJS) is a rare autosomal-dominant inherited disorder characterized by gastrointestinal hamartomas, mucocutaneous pigmentation, and an elevated cancer risk. Moreover, intussusception risk may be as high as 50% at the age of 20 years and is caused by large polyps. There is some evidence that endoscopic surveillance of PJS patients with removal of small intestinal polyps with a diameter of more than 15 mm efficiently prevents intussusceptions. In recent years, capsule endoscopy (CE) has largely replaced small-bowel radiography techniques to screen for small-bowel polyps. Magnetic resonance imaging may be equally efficient as CE for screening of large polyps. Balloon enteroscopy may be used for endoscopic snare resection of polyps. This article is part of an expert video encyclopedia.
The small intestine is a part of the gastrointestinal tract in which digestion and absorption of nutrients takes place. The small bowel follows the stomach and is followed by the large intestine, reaching from the pylorus to the valve of Bauhin and is separated into the duodenum, the jejunum, and the ileum.
Capsule endoscopy (CE) has the potential to offer a perfect overview of the small-bowel mucosa and complete visualization of the entire small bowel is achieved in most cases. In this video, there is an overview offered on normal findings in small-bowel CE and typical anatomical landmarks are indicated. This article is part of an expert video encyclopedia.
This is an example of capsule endoscopy (CE) revealing terminal ileitis in an young male patient with recurrent abdominal pain who had previously been investigated with colonoscopy and esophagogastroduodenoscopy without any significant findings. CE revealed severe inflammation of the terminal ileum. This article is part of an expert video encyclopedia.
Small bowel tumors are detected in approximately 10% of patients with small bowel endoscopies for obscure or overt mid-intestinal bleeding. Small bowel tumors may be of malignant or benign etiology. Malignant etiologies include adenocarcinoma, neuroendocrine tumors, or lymphoma, whereas benign lesions are typically lipomas, inflammatory polyps, or adenomas. Within the group of nonneoplastic lesions inflammatory polyps are most frequent. Significant bleeding and bowel obstruction due to intussusception might occur, and surgical or endoscopic treatment has been reported for symptomatic patients. A case is demonstrated with an inflammatory fibroid polyp detected by capsule endoscopy and confirmed by balloon enteroscopy. This article is part of an expert video encyclopedia.
Operatively altered anatomy such as Billroth II gastroenterostomy represents a challenge in endoscopic retrograde cholangiopancreatography and might require dedicated instruments. In this article, the authors demonstrate the technique of endoscopic retrograde cholangiography and sphincterotomy in a patient with Billroth's operation-II. Sphincterotomy is performed with a specially designed Billroth papillotome to enable papillotomy in the direction of the papillary roof. This article is part of an expert video encyclopedia.
In this article, the video demonstrated is an example of a 76-year-old male patient who presented with recurrent intestinal bleeding of unknown origin at the university hospital. Previously performed upper and lower gastrointestinal tract endoscopy did not reveal a bleeding lesion. Capsule endoscopy revealed small-bowel angiectasia that were treated by argon plasma coagulation at subsequent balloon enteroscopy. This article is part of an expert video encyclopedia.
Small bowel endoscopy is indicated for patients with an unidentified bleeding site in esophagogastroduodenoscopy and ileocolonoscopy and symptoms of intestinal blood loss or unexplained anemia. In approximately two-thirds of these cases, capsule endoscopy (CE) detects a lesion within the small bowel that explains the patient's symptoms. In few cases, though, lesions outside of the small bowel might be revealed by CE. Therefore, attention to all intestines that are visualized by CE might be necessary not to overlook bleeding sites that had not been discovered by prior flexible endoscopy.
Here the case of a 71-year-old male patient with unexplained anemia is presented by the authors. Small-bowel CE revealed minor bleeding from a neoplastic mass in the cecum. The final diagnosis of an adenocarcinoma of the ascending colon was established after the patient underwent a right hemicolectomy. This article is part of an expert video encyclopedia.
Small bowel endoscopy is indicated for patients with an unidentified bleeding site in esophago-gastro-duodenoscopy and ileo-colonoscopy and symptoms of intestinal blood loss or unexplained anemia. In approximately two-thirds of these cases, capsule endoscopy (CE) detects a lesion within the small bowel that explains the patient's symptoms. In few cases, though, lesions outside of the small bowel might be revealed by CE. Therefore, attention to all intestines that are visualized by CE might be necessary not to overlook bleeding sites that had not been discovered by prior flexible endoscopy.
The authors present the case of a 71-year-old male patient who presented to their outpatient clinic for unexplained anemia. Small bowel CE revealed minor bleeding from an adenocarcinoma in the cecum. This article is part of an expert video encyclopedia.
Operatively altered anatomy might provide a challenge for endoscopic retrograde cholangiopancreatography. However, with the support of the balloon-assisted enteroscopy technique the access route to the biliary system even in long-limb Roux-Y anastomosis is feasible in most cases.
In this video case report, an 81-year-old woman was symptomatic for stone obstruction of the common bile duct (CBD). Complete gastrectomy had been performed in this patient for stomach cancer many years earlier. Balloon-assisted enteroscopy was used for retrograde access of the duodenum via a Roux-Y anastomosis. There was major difficulty in intubating the CBD via the native papilla in this case because access was prevented by the tangential approach of the enteroscope. After performing an incomplete papillectomy, the insertion of a guidewire into the CBD was feasible and the bile duct stone was removed. This article is part of an expert video encyclopedia.
Here the authors report the case of an elderly woman who had upper abdominal pain, upper gastrointestinal hemorrhage, and jaundice (a symptomatic triad termed the ‘Quincke’ triad) a few days after endoscopic sphincterotomy. Abdominal ultrasonography demonstrated an echo-rich filling of the choledochus consistent with hemobilia. Endoscopic retrograde cholangiography was immediately performed and blood clots were removed from the common bile duct. A nasobiliary catheter was placed to irrigate the bile duct for prevention of recurring obstruction of the bile ducts from blood clots. Further follow-up of the patient was uneventful. This article is part of an expert video encyclopedia.
Small-bowel tumors are rare and account for approximately 5% of all gastrointestinal tumors. Approximately 65% of small-bowel tumors are malignant, and approximately 40% of these tumors are adenocarcinomas. Similar to colorectal adenocarcinoma, premalignant adenomas of the small bowel may progress to carcinoma. This occurs both sporadically and in the context of hereditary tumor syndromes such as familial adenomatous polyposis or hereditary nonpolyposis colorectal cancer (Lynch syndrome). Herein cases with small-bowel adenocarcinomas visualized with both capsule endoscopy and double-balloon enteroscopy are presented. This article is part of an expert video encyclopedia.
Herbal hepatotoxicity is a rare but highly disputed disease because numerous confounding variables may complicate accurate causality assessment. Case evaluation is even more difficult when the WHO global introspection method (WHO method) is applied as diagnostic algorithm. This method lacks liver specificity, hepatotoxicity validation, and quantitative items, basic qualifications required for a sound evaluation of hepatotoxicity cases. Consequently, there are no data available for reliability, sensitivity, specificity, positive and negative predictive value. Its scope is also limited by the fact that it cannot discriminate between a positive and a negative causality attribution, thereby stimulating case overdiagnosing and overreporting. The WHO method ignores uncertainties regarding daily dose, temporal association, start, duration, and end of herbal use, time to onset of the adverse reaction, and course of liver values after herb discontinuation. Insufficiently considered or ignored are comedications, preexisting liver diseases, alternative explanations upon clinical assessment, and exclusion of infections by hepatitis A-C, cytomegalovirus (CMV), Epstein-Barr virus (EBV), herpes simplex virus (HSV), and varicella zoster virus (VZV). We clearly prefer as alternative the scale of CIOMS (Council for International Organizations of Medical Sciences) which is structured, quantitative, liver specific, and validated for hepatotoxicity. In conclusion, causality of herbal hepatotoxicity is best assessed by the liver specific CIOMS scale validated for hepatotoxicity rather than the obsolete WHO method that is liver unspecific and not validated for hepatotoxicity. CIOMS based assessments will ensure the correct diagnosis and exclude alternative diagnosis that may require other specific therapies.
For the pathologist, the diagnosis of drug induced liver injury (DILI) is challenging, because histopathological features mimic all primary hepatic and biliary diseases, lacking changes that are specific for DILI. Therefore, in any patient of suspected DILI who underwent liver biopsy, the pathologist will assure the clinician that the observed hepatic changes are compatible with DILI, but this information is less helpful due to lack of specificity. Rather, the pathologist should assess liver biopsies blindly, without knowledge of prior treatment by drugs. This will result in a detailed description of the histological findings, associated with suggestions for potential causes of these hepatic changes. Then, it is up to the physician to reassess carefully the differential diagnoses, if not done before. At present, liver histology is of little impact establishing the diagnosis of DILI with the required degree of certainty, and this shortcoming also applies to herb induced liver injury (HILI). To reach at the correct diagnoses of DILI and HILI, clinical and structured causality assessments are therefore better approaches than liver histology results obtained through liver biopsy, an invasive procedure with a low complication rate.
The relationship between achievement of a pathologic complete response (pCR) and favorable long-term outcome varies among breast cancer subtypes. We aimed to highlight which neoadjuvant treatment strategy could be most successful in each breast cancer subtype. A recent FDA meta-analysis on randomized neoadjuvant breast cancer trials suggests that the survival differences of patients with or without a pCR were less pronounced in luminal A-like tumors, despite the overall favorable prognosis of these patients. Moreover, even though the strong prognostic effect of pCR in HER2 positive and TNBC, the NOAH study was the only trial which showed a trend in surrogacy of pCR for long-term outcome in HER2-positive subtype. Results from GeparTrio study suggest that patients with hormone-positive tumors might need a response-guided approach, with either an intensification of treatment in case of an early response or a change to other chemotherapy in case of no early response. Furthermore, data from German neoadjuvant trials confirm that an increasing number of chemotherapy cycles is associated with a higher pCR rate, especially in patients with HER2-positive/hormone-positive tumors. In line with these suggestions, Tryphaena study showed a pCR rate that exceeding the 60% threshold, the highest pCR results presented in a large multicenter study. In TNBC, the highest pCR rate in the German neoadjuvant studies was obtained with the simultaneous application of docetaxel, doxorubicin and cyclophosphamide for 6 cycles. However, as shown in GaparQuinto and NSABP 40 trials, treatment effect in TNBC might be further maximized by adding bevacizumab, and two randomized neoadjuvant trials are expected this year to report data on the efficacy of carboplatin.
Hepatology highlights
(2013)
Cognition requires the dynamic modulation of effective connectivity, i.e. the modulation of the postsynaptic neuronal response to a given input. If postsynaptic neurons are rhythmically active, this might entail rhythmic gain modulation, such that inputs synchronized to phases of high gain benefit from enhanced effective connectivity. We show that visually induced gamma-band activity in awake macaque area V4 rhythmically modulates responses to unpredictable stimulus events. This modulation exceeded a simple additive superposition of a constant response onto ongoing gamma-rhythmic firing, demonstrating the modulation of multiplicative gain. Gamma phases leading to strongest neuronal responses also led to shortest behavioral reaction times, suggesting functional relevance of the effect. Furthermore, we find that constant optogenetic stimulation of anesthetized cat area 21a produces gamma-band activity entailing a similar gain modulation. As the gamma rhythm in area 21a did not spread backwards to area 17, this suggests that postsynaptic gamma is sufficient for gain modulation.
Sinnbild der Liebe, Motor des Lebens, faustgroßer Muskelsack – all das ist das Herz. Zahlreiche Sprichworte in allen Sprachen der Welt zeigen, welch zentrale Bedeutung wir Menschen diesem lebenswichtigen Organ immer schon beigemessen haben. Auch wenn wir heute wissen, dass das Herz nicht Sitz der Seele ist – seine zentrale Bedeutung ist unumstritten und ganz real. Auch und gerade dann, wenn es um alternde Herzen geht.
Ziel der vorliegenden prospektiven, experimentellen, randomisierten kontrollierten In-vitroStudie war es, zwei Dentinadhäsive, die der sechsten (One-Up-Bond F, Tokuyama) und siebten (G-Bond, GC Tokio) Generation angehören, unter ISO-Bedingungen zu untersuchen und einer Kontrollgruppe (Clearfil SE, Kuraray), die der sechsten Generation zugeordnet wird, gegenüberzustellen. Neunzig unversehrte humane Molaren der zweiten Dentition wurden eingebettet. Das Dentin wurde mit Siliziumcarbidscheiben der Körnung 600 bearbeitet, um eine Schmierschicht zu erhalten. Anschließend wurden die Dentinproben randomisiert in drei Gruppen eingeteilt und die jeweiligen Dentinadhäsive wurden nach Herstellerangaben appliziert. Mittels einer Versuchsapparatur, die in Anlehnung an die ISO/TS 11405:2003 hergestellt wurde, wurde das Kompositmaterial Tetric EvoCeram in der Farbe A2 aufgetragen und lichtgehärtet. Eine Alterung der Proben fand bei 500 Thermocycling-Zyklen bei Temperaturen von 5°C und 55°C statt. Mit einer Universalprüfmaschine Zwicki (Vorschubgeschwindigkeit 0,5 mm/min) wurde die Scherhaftfestigkeit der Proben bestimmt. Anschließend wurden die abgescherten Dentinproben unter dem Rasterelektronenmikroskop bei einer Vergrößerung von 20-fach und 2000-fach bezüglich der auftretenden Frakturmodi untersucht.
Die Haftkraft-Mittelwerte von Clearfil SE betrugen 4,22 MPa, von G-Bond 3,83 MPa und von One-Up-Bond F 7,11 MPa. Bei der statistischen Analyse mittels Kruskal-Wallis-Test wurde die Signifikanz ermittelt. Eine Signifikanz zwischen den Dentinadhäsiven One-UpBond F und G-Bond lag vor. Einzig Clearfil SE war statistisch nicht signifikant gegenüber den anderen Produkten. Die Bruchanalyse ergab, dass G-Bond eine hohe Anzahl (46,7 %) an kohäsiven Frakturen aufwies, Clearfil SE mehr als die Hälfte (66,7 %) gemischte Frakturen und dass One-Up-Bond F kaum adhäsive (3,3 %) Frakturen zeigte, sondern hauptsächlich (80 %) gemischte Brüche. Signifikante Unterschiede waren zwischen dem Bruchverhalten von Clearfil SE und G-Bond sowie zwischen G-Bond und One-Up-Bond F zu beobachten.
Unter der Limitation der vorliegenden In-vitro-Studie erscheint die Anwendung von G-Bond aufgrund der erhaltenen statistisch signifikant niedrigeren Haftwerten als nicht empfehlenswert.
MoSyD-Szenestudie ... : die offene Drogenszene in Frankfurt am Main / Centre for Drug Research
(2013)
Bei seiner Einschulung hatte Wolfgang Niedecken ein besonderes Erlebnis, als er im Alter von 6 Jahren bemerkte, dass es höchste Zeit war, ordentlich sprechen zu lernen. Im Elternhaus war ausschließlich Kölsch gesprochen worden. Hochdeutsch war seine erste Fremdsprache, die sie in letzter Konsequenz auch immer geblieben ist. Denken, empfinden und träumen tut Niedecken nach wie vor auf Kölsch, wie er selbst beteuert.
Im Sommer 1976 schreibt Wolfgang Niedecken seinen ersten Song auf Kölsch: "Helfe kann dir keiner". 1979 erscheint sein erstes Album mit dem Titel: "Wolfgang Niedecken’s BAP rockt andere kölsche Leeder".
Nie hat sich BAP auf seinen Tourneen vor den „Karren politischer Machthaber“ spannen lassen. Zu Zeiten zweier deutscher Staaten sorgten die offenen Worte von „Deshalv spill`mer he“ für einen Eklat. Das Lied sprach sich unmissverständlich nicht nur für die westdeutsche Friedensbewegung, sondern ebenfalls für die ostdeutschen Friedens- und Menschenrechtsinitiativen aus. Als die DDR-Kulturbehörden BAP verboten, den Song zu spielen, platzt am Vorabend des ersten Konzertes im Berliner Palast der Republik die über 14 Stationen geplante und längst ausverkaufte DDR-Tournee.
Am 9. November 1992 findet das „Arsch huh“-Konzert gegen Ausländerfeindlichkeit und Rassismus auf dem Kölner Chlodwigplatz vor über 100.000 Menschen statt. Danach ähnliche Konzerte in Frankfurt „Heute die, morgen Du“ und in Leipzig „Gewalt ätzt“ vor ähnlich großer Kulisse. Für sein gesellschaftspolitisches Engagement bekommt Niedecken 1998 das Bundesverdienstkreuz von Bundespräsident Roman Herzog überreicht. In der Laudatio heißt es: „Kölsch-Rock, BAP und Kölner Dialekt sind untrennbar mit ihm verbunden. Er ist einer der profiliertesten Rockmusiker Deutschlands. Als engagierter Künstler hat er sich nachhaltig für Frieden, Toleranz, Demokratie und gegen Fremdenfeindlichkeit eingesetzt.“
Zu Niedeckens 60. Geburtstag, den er am 30. März 2011 mit etwa 500 Gästen auf einem Rheinschiff feiert, sendet der WDR die „Niedecken-Nacht“. Zu seinem Geburtstag erscheint im Verlag Hoffmann und Campe auch das Buch „Für 'ne Moment. Autobiographie“. Auf über 500 Seiten erzählt der Musiker von seiner Familie, einer behüteten frühen Kindheit und der schwierigen Zeit als Heranwachsender im katholischen Internat, von seinem Kunststudium und Aufenthalten in der New Yorker Kunstszene, der ehe zufälligen Gründung von BAP, die zur erfolgreichsten Mundartgruppe Deutschlands wurde.
Und dann das: Am 2. November gegen 13 Uhr bemerkt Wolfgang Niedecken beim Lesen, „dass ich nichts mehr kapierte. Ich musste die Seiten immer wieder neu lesen. Dann wurde es nebelig vor den Augen, alles sah merkwürdig aus, mein ganzes Umfeld hatte amorphe Formen. Und dann begegnete ich Gott sei Dank meinem Schutzengel.“ Wolfgang Niedecken hatte einen Schlaganfall erlitten, obwohl er eigentlich kein typischer Schlaganfallpatient war. Es kann also jeden treffen! Dank des schnellen Reagierens seiner Frau Tina konnte das Schlimmste verhindert werden.
Sie kommen per Schiff, Flugzeug, Auto oder in den Profilen von Wanderschuhen reiselustiger Globetrotter – Pflanzen, Tiere und Mikroorganismen, die in unseren Breiten normalerweise nicht heimisch sind. Teilweise führen sie bei uns anfangs über Jahre und Jahrzehnte ein Schattendasein – um sich dann plötzlich explosionsartig zu vermehren und heimische Arten zu verdrängen. Förderlich für diese Invasion fremder Arten ist auch der Klimawandel.
Inflammation has been recognized as a common trait in the pathogenesis of multifactorial diseases including obesity, where a low-grade inflammation has been established and may be responsible for the cardiovascular risk related to the disease. Obesity has also been associated with the increased incidence and a worse outcome of rheumatoid arthritis (RA) and osteoarthritis (OA). RA is characterized by systemic inflammation, which is thought to play a key role in accelerated atherosclerosis and in the increased incidence of cardiovascular disease, an important comorbidity in patients with RA. The inflammatory process underlying the cardiovascular risk both in obesity and RA may be mediated by adipocytokines, a heterogeneous group of soluble proteins mainly secreted by the adipocytes. Many adipocytokines are mainly produced by white adipose tissue. Adipocytokines may also be involved in the pathogenesis of OA since a positive association with obesity has been found for weight-bearing and nonweight-bearing joints, suggesting that, in addition to local overload, systemic factors may contribute to joint damage. In this review we summarize the current knowledge on experimental models and clinical studies in which adipocytokines were examined in obesity, RA, and OA and discuss the potential of adipocytokines as comorbidity biomarkers for cardiovascular risk.