Oxygen dependence of mitochondrial respiration in high and low altitude birds
We examined the oxygen dependence of mitochondrial respiration in the high altitude bar‐headed goose and several low altitude waterfowl species (greylag goose, barnacle goose, and mallard duck). Mitochondria were isolated from the flight muscle and their respiration was measured by high‐resolution r...
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Online Access: | http://dx.doi.org/10.1096/fasebj.23.1_supplement.598.14 |
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crwiley:10.1096/fasebj.23.1_supplement.598.14 2024-06-02T08:04:11+00:00 Oxygen dependence of mitochondrial respiration in high and low altitude birds Scott, Graham R Richards, Jeffrey G Milsom, William K Natural Sciences and Engineering Research Council of Canada 2009 http://dx.doi.org/10.1096/fasebj.23.1_supplement.598.14 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor The FASEB Journal volume 23, issue S1 ISSN 0892-6638 1530-6860 journal-article 2009 crwiley https://doi.org/10.1096/fasebj.23.1_supplement.598.14 2024-05-03T11:08:04Z We examined the oxygen dependence of mitochondrial respiration in the high altitude bar‐headed goose and several low altitude waterfowl species (greylag goose, barnacle goose, and mallard duck). Mitochondria were isolated from the flight muscle and their respiration was measured by high‐resolution respirometry at avian body temperature (41°C), with malate/pyruvate or malate/pyruvate/succinate fuel combinations. Mitochondria were well coupled with high phosphorylation efficiencies in all birds. Respiratory capacities, cytochrome oxidase excess capacity, and uncoupled respiration rates were all similar between species. Oxygen kinetics depended on respiration state, as half‐maximal mitochondrial respiration occurred at O 2 tensions (P 50 ) of 0.1‐0.2 Torr in State 4 (no ADP) and 0.8‐0.9 Torr in State 3 (maximal ADP). These data suggest that intramyocellular O 2 tension could regulate mitochondrial respiration during flight, particularly at high altitude where O 2 supply is reduced. (Supported by NSERC of Canada) Article in Journal/Newspaper Barnacle goose Wiley Online Library Canada The FASEB Journal 23 S1 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
We examined the oxygen dependence of mitochondrial respiration in the high altitude bar‐headed goose and several low altitude waterfowl species (greylag goose, barnacle goose, and mallard duck). Mitochondria were isolated from the flight muscle and their respiration was measured by high‐resolution respirometry at avian body temperature (41°C), with malate/pyruvate or malate/pyruvate/succinate fuel combinations. Mitochondria were well coupled with high phosphorylation efficiencies in all birds. Respiratory capacities, cytochrome oxidase excess capacity, and uncoupled respiration rates were all similar between species. Oxygen kinetics depended on respiration state, as half‐maximal mitochondrial respiration occurred at O 2 tensions (P 50 ) of 0.1‐0.2 Torr in State 4 (no ADP) and 0.8‐0.9 Torr in State 3 (maximal ADP). These data suggest that intramyocellular O 2 tension could regulate mitochondrial respiration during flight, particularly at high altitude where O 2 supply is reduced. (Supported by NSERC of Canada) |
author2 |
Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Scott, Graham R Richards, Jeffrey G Milsom, William K |
spellingShingle |
Scott, Graham R Richards, Jeffrey G Milsom, William K Oxygen dependence of mitochondrial respiration in high and low altitude birds |
author_facet |
Scott, Graham R Richards, Jeffrey G Milsom, William K |
author_sort |
Scott, Graham R |
title |
Oxygen dependence of mitochondrial respiration in high and low altitude birds |
title_short |
Oxygen dependence of mitochondrial respiration in high and low altitude birds |
title_full |
Oxygen dependence of mitochondrial respiration in high and low altitude birds |
title_fullStr |
Oxygen dependence of mitochondrial respiration in high and low altitude birds |
title_full_unstemmed |
Oxygen dependence of mitochondrial respiration in high and low altitude birds |
title_sort |
oxygen dependence of mitochondrial respiration in high and low altitude birds |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1096/fasebj.23.1_supplement.598.14 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Barnacle goose |
genre_facet |
Barnacle goose |
op_source |
The FASEB Journal volume 23, issue S1 ISSN 0892-6638 1530-6860 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1096/fasebj.23.1_supplement.598.14 |
container_title |
The FASEB Journal |
container_volume |
23 |
container_issue |
S1 |
_version_ |
1800748822392995840 |