Mitochondrial Alterations in PINK1 Deficient Cells Are Influenced by Calcineurin-Dependent Dephosphorylation of Dynamin-Related Protein 1
العنوان: | Mitochondrial Alterations in PINK1 Deficient Cells Are Influenced by Calcineurin-Dependent Dephosphorylation of Dynamin-Related Protein 1 |
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المؤلفون: | Richard F. Cowburn, Marcel P. van der Brug, Homira Behbahani, Kelly Jean Thomas, Rili Ahmad, Ibardo Zambrano, Megan M. Cleland, Mark R. Cookson, Anna Sandebring, David Miller, Alexandra Beilina, Angel Cedazo-Minguez |
المصدر: | PLoS ONE PLoS ONE, Vol 4, Iss 5, p e5701 (2009) |
بيانات النشر: | Public Library of Science, 2009. |
سنة النشر: | 2009 |
مصطلحات موضوعية: | Dynamins, Cell Survival, Cell Biology/Neuronal Signaling Mechanisms, lcsh:Medicine, PINK1, Mitochondrion, Biology, Mitochondrial apoptosis-induced channel, Models, Biological, Cell Line, GTP Phosphohydrolases, Mitochondrial Proteins, DNM1L, Rotenone, Humans, Phosphorylation, Inner mitochondrial membrane, lcsh:Science, Genetics and Genomics/Genetics of Disease, Neurological Disorders/Movement Disorders, Multidisciplinary, Kinase, Calcineurin, lcsh:R, Molecular biology, Cell biology, Mitochondria, Enzyme Activation, Phenotype, Gene Knockdown Techniques, DNAJA3, lcsh:Q, ATP–ADP translocase, Microtubule-Associated Proteins, Protein Kinases, Research Article |
الوصف: | PTEN-induced novel kinase 1 (PINK1) mutations are associated with autosomal recessive parkinsonism. Previous studies have shown that PINK1 influences both mitochondrial function and morphology although it is not clearly established which of these are primary events and which are secondary. Here, we describe a novel mechanism linking mitochondrial dysfunction and alterations in mitochondrial morphology related to PINK1. Cell lines were generated by stably transducing human dopaminergic M17 cells with lentiviral constructs that increased or knocked down PINK1. As in previous studies, PINK1 deficient cells have lower mitochondrial membrane potential and are more sensitive to the toxic effects of mitochondrial complex I inhibitors. We also show that wild-type PINK1, but not recessive mutant or kinase dead versions, protects against rotenone-induced mitochondrial fragmentation whereas PINK1 deficient cells show lower mitochondrial connectivity. Expression of dynamin-related protein 1 (Drp1) exaggerates PINK1 deficiency phenotypes and Drp1 RNAi rescues them. We also show that Drp1 is dephosphorylated in PINK1 deficient cells due to activation of the calcium-dependent phosphatase calcineurin. Accordingly, the calcineurin inhibitor FK506 blocks both Drp1 dephosphorylation and loss of mitochondrial integrity in PINK1 deficient cells but does not fully rescue mitochondrial membrane potential. We propose that alterations in mitochondrial connectivity in this system are secondary to functional effects on mitochondrial membrane potential. |
اللغة: | English |
تدمد: | 1932-6203 |
URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f49994f9a21b3b58c1afbeaaa22ff41 http://europepmc.org/articles/PMC2683574 |
حقوق: | OPEN |
رقم الأكسشن: | edsair.doi.dedup.....9f49994f9a21b3b58c1afbeaaa22ff41 |
قاعدة البيانات: | OpenAIRE |
تدمد: | 19326203 |
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