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• W2110259021 abstract "Summary As oxygen concentrations in marine coastal habitats can fluctuate rapidly and drastically, sessile marine organisms like the oyster Crassostrea gigas can experience marked and rapid oxygen variations. In this study, we investigated the responses of oyster gill mitochondria to short-term hypoxia (3 h and 12 h, at 1.7 mg O2 L-1) and subsequent re-oxygenation. Mitochondrial respiratory rates (state 3 and 4 stimulated by glutamate), phosphorylation efficiency (RCR ratio and ADP/O) were measured. Cytochrome c oxidase activity (CCO) and cytochrome concentrations (a, b, c1, c) were measured to investigate the rearrangements of respiratory chain subunits. The potential implication of an alternative oxidase (AOX) was investigated using an inhibitor of the respiratory chain (antimycin A) and through gene expression analysis in gills and digestive gland. Results indicate a down regulation of mitochondrial capacity, with 60% inhibition of respiratory rates after 12 h of hypoxia. RCR ratio remained stable, while ADP/O increased after 12 h of hypoxia and 1 h of re-oxygenation, suggesting increased phosphorylation efficiency. CCO showed a fast and remarkable increase of its catalytic activity only after 3 h of hypoxia. AOX mRNA levels showed similar patterns in gill and digestive gland, and were up regulated after 12 and 24 h of hypoxia and during re-oxygenation. Results suggest a set of controls in regulating mitochondrial functions in response to oxygen fluctuations and demonstrate the fast and extreme plasticity of oyster mitochondria in response to oxygen variations." @default.
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• W2110259021 date "2013-01-01" @default.
• W2110259021 modified "2023-10-18" @default.
• W2110259021 title "Rapid mitochondrial adjustments in response to short-term hypoxia and re-oxygenation in the Pacific oyster <i>Crassostrea gigas</i>" @default.
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• W2110259021 doi "https://doi.org/10.1242/jeb.075879" @default.
• W2110259021 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23307802" @default.
• W2110259021 hasPublicationYear "2013" @default.
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