Mitochondrial peroxiredoxin-5 as potential modulator of mitochondria-ER crosstalk in MPP+-induced cell death
| Autor: | Emmanuel Hermans, Stéphanie De Simoni, Dominique Linard, Bernard Knoops, Julie Goemaere |
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| Rok vydání: | 2012 |
| Předmět: |
Boron Compounds
Programmed cell death Dopamine Agents Apoptosis Biology Mitochondrion Endoplasmic Reticulum Transfection Biochemistry Mitochondrial apoptosis-induced channel DNA Mitochondrial Cellular and Molecular Neuroscience Mice Neuroblastoma Adenosine Triphosphate Cell Line Tumor medicine Animals Humans Enzyme Inhibitors RNA Small Interfering Hydro-Lyases Calpain Caspase 3 Endoplasmic reticulum Neurodegeneration PRDX5 Peroxiredoxins medicine.disease Caspase 9 Cell biology Mitochondria Gene Expression Regulation 1-Methyl-4-phenyl-1 2 3 6-tetrahydropyridine Tyrosine Calcium Peroxiredoxin Reactive Oxygen Species Intracellular Subcellular Fractions |
| Zdroj: | Journal of neurochemistry. 125(3) |
| ISSN: | 1471-4159 |
| Popis: | Peroxiredoxin-5 (PRDX5) is an antioxidant enzyme which differs from the other peroxiredoxins with regards to its enzymatic mechanism, its high affinity for organic peroxides and peroxynitrite and its wide subcellular distribution. In particular, the mitochondrial isoform of PRDX5 confers a remarkable cytoprotection toward oxidative stress to mammalian cells. Mitochondrial dysfunction and disruption of Ca²⁺ homeostasis are implicated in neurodegeneration. Growing evidence supports that endoplasmic reticulum (ER) could operate in tandem with mitochondria to regulate intracellular Ca²⁺ fluxes in neurodegenerative processes. Here, we overexpressed mitochondrial PRDX5 in SH-SY5Y cells to dissect the role of this enzyme in 1-methyl-4-phenylpyridinium (MPP)⁺-induced cell death. Our data show that mitochondria-dependent apoptosis triggered by MPP⁺, assessed by the measurement of caspase-9 activation and mitochondrial DNA damage, is prevented by mitochondrial PRDX5 overexpression. Moreover, PRDX5 overexpression blocks the increase in intracellular Ca²⁺, Ca²⁺-dependent activation of calpains and Bax cleavage. Finally, using Ca²⁺ channel inhibitors (Nimodipine, Dantrolene and 2-APB), we show that Ca²⁺ release arises essentially from ER stores through 1,4,5-inositol-trisphosphate receptors (IP3 R). Altogether, our results suggest that the MPP⁺ mitochondrial pathway of apoptosis is regulated by mitochondrial PRDX5 in a process that could involve redox modulation of Ca²⁺ transporters via a crosstalk between mitochondria and ER. |
| Databáze: | OpenAIRE |
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