期刊
EXPERIMENTAL CELL RESEARCH
卷 316, 期 7, 页码 1213-1224出版社
ELSEVIER INC
DOI: 10.1016/j.yexcr.2010.01.005
关键词
Omi; HtrA2; Mitochondria; Fusion; OPA1; Parkinson's disease
资金
- German Research Council [KR2119/3-1]
- German National Genome Research Network
- European Union research program [FP7]
- Wellcome Trust [081987]
- Parkinson's Disease Society [G-0713]
- European Union
- Medical Research Council [G0700091B, MC_G1000735] Funding Source: researchfish
- Parkinson's UK [G-0713] Funding Source: researchfish
- MRC [MC_G1000735] Funding Source: UKRI
Loss of Omi/HtrA2 function leads to nerve cell loss in mouse models and has been linked to neurodegeneration in Parkinson's and Huntington's disease. Omi/HtrA2 is a serine protease released as a pro-apoptotic factor from the mitochondrial intermembrane space into the cytosol. Under physiological conditions, Omi/HtrA2 is thought to be involved in protection against cellular stress, but the cytological and molecular mechanisms are not clear. Omi/HtrA2 deficiency caused an accumulation of reactive oxygen species and reduced mitochondrial membrane potential. In Omi/HtrA2 knockout mouse embryonic fibroblasts, as well as in Omi/HtrA2 silenced human HeLa cells and Drosophila S2R+ cells, we found elongated mitochondria by live cell imaging. Electron microscopy confirmed the mitochondrial morphology alterations and showed abnormal cristae structure. Examining the levels of proteins involved in mitochondrial fusion, we found a selective up-regulation of more soluble OPA1 protein. Complementation of knockout cells with wild-type Omi/HtrA2 but not with the protease mutant [S306A]Omi/HtrA2 reversed the mitochondrial elongation phenotype and OPA1 alterations. Finally, co-immunoprecipitation showed direct interaction of Omi/HtrA2 with endogenous OPA1. Thus, we show for the first time a direct effect of loss of Omi/HtrA2 on mitochondrial morphology and demonstrate a novel role of this mitochondrial serine protease in the modulation of OPA1. Our results underscore a critical role of impaired mitochondrial dynamics in neurodegenerative disorders. (C) 2010 Elsevier Inc. All rights reserved.
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