{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T12:54:31Z","timestamp":1787748871829,"version":"build-2784847793"},"reference-count":55,"publisher":"The Company of Biologists","issue":"16","license":[{"start":{"date-parts":[[2024,8,20]],"date-time":"2024-08-20T00:00:00Z","timestamp":1724112000000},"content-version":"vor","delay-in-days":5,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Natural Sciences and Engineering Council of Canada","award":["RGPIN 462246-2014 and RGPIN-2019-07028"],"award-info":[{"award-number":["RGPIN 462246-2014 and RGPIN-2019-07028"]}]},{"name":"Canadian Fund for Innovation"},{"DOI":"10.13039\/100011025","name":"Canadian Society of Zoologists","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100011025","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,8,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>Adult, lab-reared, highland deer mice acclimate to hypoxia by increasing reliance on carbohydrates to fuel exercise. Yet neither the underlying mechanisms for this shift in fuel use nor the impact of lifetime hypoxia exposure experienced in high alpine conditions, are fully understood. Thus, we assessed the use of fuel during exercise in wild highland deer mice running in their native environment. We examined a key step in muscle carbohydrate oxidation \u2013 the regulation of pyruvate dehydrogenase (PDH) \u2013 during exercise at altitude in wild highlanders and in first generation (G1) lab-born and -raised highlanders acclimated to normoxia or hypoxia. PDH activity was also determined in the gastrocnemius of G1 highlanders using an in situ muscle preparation. We found that wild highlanders had a high reliance on carbohydrates while running in their native environment, consistent with data from hypoxia-acclimated G1 highlanders. PDH activity in the gastrocnemius was similar post exercise between G1 and wild highlanders. However, when the gastrocnemius was stimulated at a light work rate in situ, PDH activity was higher in hypoxia-acclimated G1 highlanders and was associated with lower intramuscular lactate levels. These findings were supported by lower PDH kinase 2 protein production in hypoxia-acclimated G1 mice. Our findings indicate that adult phenotypic plasticity in response to low oxygen is sufficient to increase carbohydrate reliance during exercise in highland deer mice. Additionally, variation in PDH regulation with hypoxia acclimation contributes to shifts in whole-animal patterns of fuel use and is likely to improve exercise performance via elevated energy yield per mole of O2.\u2003<\/jats:p>","DOI":"10.1242\/jeb.246890","type":"journal-article","created":{"date-parts":[[2024,7,26]],"date-time":"2024-07-26T07:39:42Z","timestamp":1721979582000},"source":"Crossref","is-referenced-by-count":3,"title":["Regulation of muscle pyruvate dehydrogenase activity and fuel use during exercise in high-altitude deer mice"],"prefix":"10.1242","volume":"227","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-4866-878X","authenticated-orcid":false,"given":"Soren Z.","family":"Coulson","sequence":"first","affiliation":[{"name":"McMaster University Department of Biology , , 1280 Main Street West, Hamilton, ON , Canada , L8S 4K1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5044-6850","authenticated-orcid":false,"given":"Sulayman A.","family":"Lyons","sequence":"additional","affiliation":[{"name":"McMaster University Department of Biology , , 1280 Main Street West, Hamilton, ON , Canada , L8S 4K1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6769-2852","authenticated-orcid":false,"given":"Cayleih E.","family":"Robertson","sequence":"additional","affiliation":[{"name":"McMaster University Department of Biology , , 1280 Main Street West, Hamilton, ON , Canada , L8S 4K1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benjamin","family":"Fabello","sequence":"additional","affiliation":[{"name":"McMaster University Department of Biology , , 1280 Main Street West, Hamilton, ON , Canada , L8S 4K1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren M.","family":"Dessureault","sequence":"additional","affiliation":[{"name":"McMaster University Department of Biology , , 1280 Main Street West, Hamilton, ON , Canada , L8S 4K1"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1500-9983","authenticated-orcid":false,"given":"Grant B.","family":"McClelland","sequence":"additional","affiliation":[{"name":"McMaster University Department of Biology , , 1280 Main Street West, Hamilton, ON , Canada , L8S 4K1"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2024,8,20]]},"reference":[{"key":"2024082007173271900_JEB246890C1","doi-asserted-by":"publisher","first-page":"274","DOI":"10.1016\/0003-2697(90)90292-H","article-title":"Radioisotopic assays of CoASH and carnitine and their acetylated forms in human skeletal muscle","volume":"185","author":"Cederblad","year":"1990","journal-title":"Anal. 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