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  • Drott, Ulrich (3)
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ATP synthase deficiency due to TMEM70 mutation leads to ultrastructural mitochondrial degeneration and is amenable to treatment (2015)
Braczynski, Anne Kristin ; Vlaho, Stefan ; Müller, Klaus ; Wittig, Ilka ; Blank, Anna-Eva ; Tews, Dominique Suzanne ; Drott, Ulrich ; Kleinle, Stephanie ; Abicht, Angela ; Horvath, Rita ; Plate, Karl H. ; Stenzel, Werner ; Goebel, Hans Hilmar ; Schulze-Bonhage, Andreas ; Harter, Patrick Nikolaus ; Kieslich, Matthias ; Mittelbronn, Michel Guy André
TMEM70 is involved in the biogenesis of mitochondrial ATP synthase and mutations in the TMEM70 gene impair oxidative phosphorylation. Herein, we report on pathology and treatment of ATP synthase deficiency in four siblings. A consanguineous family of Roma (Gipsy) ethnic origin gave birth to 6 children of which 4 were affected presenting with dysmorphic features, failure to thrive, cardiomyopathy, metabolic crises, and 3-methylglutaconic aciduria as clinical symptoms. Genetic testing revealed a homozygous mutation (c.317-2A>G) in the TMEM70 gene. While light microscopy was unremarkable, ultrastructural investigation of muscle tissue revealed accumulation of swollen degenerated mitochondria with lipid crystalloid inclusions, cristae aggregation, and exocytosis of mitochondrial material. Biochemical analysis of mitochondrial complexes showed an almost complete ATP synthase deficiency. Despite harbouring the same mutation, the clinical outcome in the four siblings was different. Two children died within 60 h after birth; the other two had recurrent life-threatening metabolic crises but were successfully managed with supplementation of anaplerotic amino acids, lipids, and symptomatic treatment during metabolic crisis. In summary, TMEM70 mutations can cause distinct ultrastructural mitochondrial degeneration and almost complete deficiency of ATP synthase but are still amenable to treatment.
Influence of antisynthetase antibodies specificities on antisynthetase syndrome clinical spectrum time course (2019)
Cavagna, Lorenzo ; Trallero-Araguás, Ernesto ; Meloni, Federica ; Cavazzana, Ilaria ; Rojas-Serrano, Jorge ; Feist, Eugen ; Zanframundo, Giovanni ; Morandi, Valentina ; Meyer, Alain ; Silva, José António Pereira da ; Matos Costa, Carlo Jorge ; Molberg, Oyvind ; Andersson, Helena ; Codullo, Veronica ; Mosca, Marta ; Barsotti, Simone ; Neri, Rossella ; Scirè, Carlo Alberto ; Govoni, Marcello ; Furini, Federica ; López-Longo, Francisco Javier ; Martínez-Barrio, Julia ; Schneider, Udo ; Lorenz, Hanns-Martin ; Doria, Andrea ; Ghirardello, Anna ; Ortego-Centeno, Norberto ; Confalonieri, Marco ; Tomietto, Paola ; Pipitone, Nicolò ; Rodriguez Cambron, Ana Belen ; Blázquez Cañamero, María Ángeles ; Voll, Reinhard ; Wendel, Sarah ; Scarpato, Salvatore ; Maurier, Francois ; Limonta, Massimiliano ; Colombelli, Paolo ; Giannini, Margherita ; Geny, Bernard ; Arrigoni, Eugenio ; Bravi, Elena ; Migliorini, Paola ; Mathieu, Alessandro ; Piga, Matteo ; Drott, Ulrich ; Delbrück, Christiane ; Bauhammer, Jutta ; Cagnotto, Giovanni ; Vancheri, Carlo ; Sambataro, Gianluca ; De Langhe, Ellen ; Sainaghi, Pier Paolo ; Monti, Cristina ; Berzolari, Francesca Gigli ; Romano, Mariaeva ; Bonella, Francesco ; Specker, Christof ; Schwarting, Andreas ; Villa Blanco, Ignacio ; Selmi, Carlo ; Ceribelli, Angela ; Nuno, Laura ; Mera-Varela, Antonio ; Gomez, Nair Perez ; Fusaro, Enrico ; Parisi, Simone ; Sinigaglia, Luigi ; Del Papa, Nicoletta ; Benucci, Maurizio ; Cimmino, Marco Amedeo ; Riccieri, Valeria ; Conti, Fabrizio ; Sebastiani, Gian Domenico ; Iuliano, Annamaria ; Emmi, Giacomo ; Cammelli, Daniele ; Sebastiani, Marco ; Manfredi, Andreina ; Bachiller Corral, Javier ; Sifuentes Giraldo, Walter Alberto ; Paolazzi, Giuseppe ; Saketkoo, Lesley Ann ; Giorgi, Roberto ; Salaffi, Fausto ; Cifrian, Jose ; Caporali, Roberto ; Locatelli, Francesco ; Marchioni, Enrico ; Pesci, Alberto ; Dei, Giulia ; Pozzi, Maria Rosa ; Claudia, Lomater ; Distler, Jörg Hans Wilhelm ; Knitza, Johannes ; Schett, George ; Iannone, Florenzo ; Fornaro, Marco ; Franceschini, Franco ; Quartuccio, Luca ; Gerli, Roberto ; Bartoloni, Elena ; Bellando-Randone, Silvia ; Zampogna, Giuseppe ; Gonzalez Perez, Montserrat I. ; Mejia, Mayra ; Vicente, Esther ; Triantafyllias, Konstantinos ; López-Mejias, Raquel ; Matucci-Cerinic, Marco ; Selva-O’Callaghan, Albert ; Castañeda, Santos ; Montecucco, Carlomaurizio ; González-Gay, Miguel Ángel
Antisynthetase syndrome (ASSD) is a rare clinical condition that is characterized by the occurrence of a classic clinical triad, encompassing myositis, arthritis, and interstitial lung disease (ILD), along with specific autoantibodies that are addressed to different aminoacyl tRNA synthetases (ARS). Until now, it has been unknown whether the presence of a different ARS might affect the clinical presentation, evolution, and outcome of ASSD. In this study, we retrospectively recorded the time of onset, characteristics, clustering of triad findings, and survival of 828 ASSD patients (593 anti-Jo1, 95 anti-PL7, 84 anti-PL12, 38 anti-EJ, and 18 anti-OJ), referring to AENEAS (American and European NEtwork of Antisynthetase Syndrome) collaborative group’s cohort. Comparisons were performed first between all ARS cases and then, in the case of significance, while using anti-Jo1 positive patients as the reference group. The characteristics of triad findings were similar and the onset mainly began with a single triad finding in all groups despite some differences in overall prevalence. The “ex-novo” occurrence of triad findings was only reduced in the anti-PL12-positive cohort, however, it occurred in a clinically relevant percentage of patients (30%). Moreover, survival was not influenced by the underlying anti-aminoacyl tRNA synthetase antibodies’ positivity, which confirmed that antisynthetase syndrome is a heterogeneous condition and that antibody specificity only partially influences the clinical presentation and evolution of this condition.
Diagnostic and clinical relevance of the autophago-lysosomal network in human gliomas (2016)
Jennewein, Lukas ; Ronellenfitsch, Michael Wilfried ; Antonietti, Patrick ; Ilina, Elena ; Jung, Jennifer ; Stadel, Daniela ; Flohr, Lisa-Marie ; Zinke, Jenny ; Renesse, Janusz von ; Drott, Ulrich ; Baumgarten, Peter ; Braczynski, Anne Kristin ; Penski, Cornelia ; Burger, Michael Christian ; Theurillat, Jean-Philippe ; Steinbach, Joachim Peter ; Plate, Karl H. ; Đikić, Ivan ; Fulda, Simone ; Brandts, Christian Hubertus ; Kögel, Donat ; Behrends, Christian ; Harter, Patrick Nikolaus ; Mittelbronn, Michel Guy André
Recently, the conserved intracellular digestion mechanism ‘autophagy’ has been considered to be involved in early tumorigenesis and its blockade proposed as an alternative treatment approach. However, there is an ongoing debate about whether blocking autophagy has positive or negative effects in tumor cells. Since there is only poor data about the clinico-pathological relevance of autophagy in gliomas in vivo, we first established a cell culture based platform for the in vivo detection of the autophago-lysosomal components. We then investigated key autophagosomal (LC3B, p62, BAG3, Beclin1) and lysosomal (CTSB, LAMP2) molecules in 350 gliomas using immunohistochemistry, immunofluorescence, immunoblotting and qPCR. Autophagy was induced pharmacologically or by altering oxygen and nutrient levels. Our results show that autophagy is enhanced in astrocytomas as compared to normal CNS tissue, but largely independent from the WHO grade and patient survival. A strong upregulation of LC3B, p62, LAMP2 and CTSB was detected in perinecrotic areas in glioblastomas suggesting micro-environmental changes as a driver of autophagy induction in gliomas. Furthermore, glucose restriction induced autophagy in a concentration-dependent manner while hypoxia or amino acid starvation had considerably lesser effects. Apoptosis and autophagy were separately induced in glioma cells both in vitro and in vivo. In conclusion, our findings indicate that autophagy in gliomas is rather driven by micro-environmental changes than by primary glioma-intrinsic features thus challenging the concept of exploitation of the autophago-lysosomal network (ALN) as a treatment approach in gliomas.
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