Reference : Modulation of mitochondrial function and morphology by interaction of Omi/HtrA2 with ...
Scientific journals : Article
Life sciences : Genetics & genetic processes
Modulation of mitochondrial function and morphology by interaction of Omi/HtrA2 with the mitochondrial fusion factor OPA1.
Kieper, Nicole [> >]
Holmstrom, Kira M. [> >]
Ciceri, Dalila [> >]
Fiesel, Fabienne C. [> >]
Wolburg, Hartwig [> >]
Ziviani, Elena [> >]
Whitworth, Alexander J. [> >]
Martins, Luisa []
Kahle, Philipp J. [> >]
Krüger, Rejko mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit]
Experimental cell research
Yes (verified by ORBilu)
United States
[en] Animals ; Cells, Cultured ; Drosophila ; Embryo, Mammalian ; GTP Phosphohydrolases/genetics/metabolism ; HeLa Cells ; Humans ; Membrane Fusion Proteins/genetics/metabolism ; Membrane Potential, Mitochondrial/genetics ; Mice ; Mice, Knockout ; Mitochondria/metabolism/physiology ; Mitochondrial Membranes/metabolism/physiology ; Mitochondrial Proteins/genetics/metabolism ; Organelle Shape/genetics/physiology ; Protein Binding/physiology ; Reactive Oxygen Species/metabolism ; Serine Endopeptidases/genetics/metabolism
[en] 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.
Luxembourg Centre for Systems Biomedicine (LCSB): Clinical & Experimental Neuroscience (Krüger Group)
Copyright 2010 Elsevier Inc. All rights reserved.

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