Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas
Abstract Sessile benthic organisms like oysters inhabit the intertidal zone, subject to alternating hypoxia and reoxygenation (H/R) episodes during tidal movements, impacting respiratory chain activities and metabolome compositions. We investigated the effects of constant severe hypoxia (90 min at ~...
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ftdoajarticles:oai:doaj.org/article:2c0ac6efc20449ec8bfe478fa1edce80 2024-09-15T18:03:12+00:00 Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas Linda Adzigbli Siriluck Ponsuksili Inna Sokolova 2024-04-01T00:00:00Z https://doi.org/10.1038/s41598-024-60261-w https://doaj.org/article/2c0ac6efc20449ec8bfe478fa1edce80 EN eng Nature Portfolio https://doi.org/10.1038/s41598-024-60261-w https://doaj.org/toc/2045-2322 doi:10.1038/s41598-024-60261-w 2045-2322 https://doaj.org/article/2c0ac6efc20449ec8bfe478fa1edce80 Scientific Reports, Vol 14, Iss 1, Pp 1-15 (2024) Mitochondrial substrate preference Succinate Electron transport system Hypoxia-reoxygenation Oxidative stress Bioenergetics Medicine R Science Q article 2024 ftdoajarticles https://doi.org/10.1038/s41598-024-60261-w 2024-08-05T17:49:29Z Abstract Sessile benthic organisms like oysters inhabit the intertidal zone, subject to alternating hypoxia and reoxygenation (H/R) episodes during tidal movements, impacting respiratory chain activities and metabolome compositions. We investigated the effects of constant severe hypoxia (90 min at ~ 0% O2 ) followed by 10 min reoxygenation, and cyclic hypoxia (5 cycles of 15 min at ~ 0% O2 and 10 min reoxygenation) on isolated mitochondria from the gill and the digestive gland of Crassostrea gigas respiring on pyruvate, palmitate, or succinate. Constant hypoxia suppressed oxidative phosphorylation (OXPHOS), particularly during Complex I-linked substrates oxidation. It had no effect on mitochondrial reactive oxygen species (ROS) efflux but increased fractional electron leak (FEL). In mitochondria oxidizing Complex I substrates, exposure to cyclic hypoxia prompted a significant drop after the first H/R cycle. In contrast, succinate-driven respiration only showed significant decline after the third to fifth H/R cycle. ROS efflux saw little change during cyclic hypoxia regardless of the oxidized substrate, but Complex I-driven FEL tended to increase with each subsequent H/R cycle. These observations suggest that succinate may serve as a beneficial stress fuel under H/R conditions, aiding in the post-hypoxic recovery of oysters by reducing oxidative stress and facilitating rapid ATP re-synthesis. The impacts of constant and cyclic hypoxia of similar duration on mitochondrial respiration and oxidative lesions in the proteins were comparable indicating that the mitochondrial damage is mostly determined by the lack of oxygen and mitochondrial depolarization. The ROS efflux in the mitochondria of oysters was minimally affected by oxygen fluctuations indicating that tight regulation of ROS production may contribute to robust mitochondrial phenotype of oysters and protect against H/R induced stress. Article in Journal/Newspaper Crassostrea gigas Directory of Open Access Journals: DOAJ Articles Scientific Reports 14 1 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Mitochondrial substrate preference Succinate Electron transport system Hypoxia-reoxygenation Oxidative stress Bioenergetics Medicine R Science Q |
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Mitochondrial substrate preference Succinate Electron transport system Hypoxia-reoxygenation Oxidative stress Bioenergetics Medicine R Science Q Linda Adzigbli Siriluck Ponsuksili Inna Sokolova Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas |
topic_facet |
Mitochondrial substrate preference Succinate Electron transport system Hypoxia-reoxygenation Oxidative stress Bioenergetics Medicine R Science Q |
description |
Abstract Sessile benthic organisms like oysters inhabit the intertidal zone, subject to alternating hypoxia and reoxygenation (H/R) episodes during tidal movements, impacting respiratory chain activities and metabolome compositions. We investigated the effects of constant severe hypoxia (90 min at ~ 0% O2 ) followed by 10 min reoxygenation, and cyclic hypoxia (5 cycles of 15 min at ~ 0% O2 and 10 min reoxygenation) on isolated mitochondria from the gill and the digestive gland of Crassostrea gigas respiring on pyruvate, palmitate, or succinate. Constant hypoxia suppressed oxidative phosphorylation (OXPHOS), particularly during Complex I-linked substrates oxidation. It had no effect on mitochondrial reactive oxygen species (ROS) efflux but increased fractional electron leak (FEL). In mitochondria oxidizing Complex I substrates, exposure to cyclic hypoxia prompted a significant drop after the first H/R cycle. In contrast, succinate-driven respiration only showed significant decline after the third to fifth H/R cycle. ROS efflux saw little change during cyclic hypoxia regardless of the oxidized substrate, but Complex I-driven FEL tended to increase with each subsequent H/R cycle. These observations suggest that succinate may serve as a beneficial stress fuel under H/R conditions, aiding in the post-hypoxic recovery of oysters by reducing oxidative stress and facilitating rapid ATP re-synthesis. The impacts of constant and cyclic hypoxia of similar duration on mitochondrial respiration and oxidative lesions in the proteins were comparable indicating that the mitochondrial damage is mostly determined by the lack of oxygen and mitochondrial depolarization. The ROS efflux in the mitochondria of oysters was minimally affected by oxygen fluctuations indicating that tight regulation of ROS production may contribute to robust mitochondrial phenotype of oysters and protect against H/R induced stress. |
format |
Article in Journal/Newspaper |
author |
Linda Adzigbli Siriluck Ponsuksili Inna Sokolova |
author_facet |
Linda Adzigbli Siriluck Ponsuksili Inna Sokolova |
author_sort |
Linda Adzigbli |
title |
Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas |
title_short |
Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas |
title_full |
Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas |
title_fullStr |
Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas |
title_full_unstemmed |
Mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve Crassostrea gigas |
title_sort |
mitochondrial responses to constant and cyclic hypoxia depend on the oxidized fuel in a hypoxia-tolerant marine bivalve crassostrea gigas |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s41598-024-60261-w https://doaj.org/article/2c0ac6efc20449ec8bfe478fa1edce80 |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
Scientific Reports, Vol 14, Iss 1, Pp 1-15 (2024) |
op_relation |
https://doi.org/10.1038/s41598-024-60261-w https://doaj.org/toc/2045-2322 doi:10.1038/s41598-024-60261-w 2045-2322 https://doaj.org/article/2c0ac6efc20449ec8bfe478fa1edce80 |
op_doi |
https://doi.org/10.1038/s41598-024-60261-w |
container_title |
Scientific Reports |
container_volume |
14 |
container_issue |
1 |
_version_ |
1810440714287316992 |