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CD36 is indispensable for nutrient homeostasis and endurance exercise capacity during prolonged fasting

Citation

Iso, T and Haruyama, H and Sunaga, H and Matsui, H and Matsui, M and Tanaka, R and Umbarawan, Y and Syamsunarno, MRAA and Putri, M and Yamaguchi, A and Hanaoka, H and Negishi, K and Yokoyama, T and Kurabayashi, M, CD36 is indispensable for nutrient homeostasis and endurance exercise capacity during prolonged fasting, Physiological Reports, 6, (18) Article e13884. ISSN 2051-817X (2018) [Refereed Article]


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DOI: doi:10.14814/phy2.13884

Abstract

During fasting, most tissues including skeletal muscle heavily rely on utilization of fatty acids (FA) and minimize glucose use. In contrast, skeletal muscle prefers carbohydrate use as exercise intensity increases. In mice deficient for CD36 (CD36-/- mice), FA uptake is markedly reduced with a compensatory increase in glucose uptake in skeletal muscle even during fasting. In this study, we questioned how exercise endurance is affected during prolonged fasting in CD36-/- mice where glucose utilization is constantly increased. With or without a 24-h fast, a single bout of treadmill exercise was started at the speed of 10 m/min, and the speed was progressively increased up to 30 m/min until mice were exhausted. Running distance of wild type (WT) and CD36-/- mice was comparable in the fed state whereas that of CD36-/- mice was significantly reduced after a 24-h fast. Glycogen levels in liver and skeletal muscle were depleted both in WT and CD36-/- mice after a 24-h fast. In CD36-/- mice, FA uptake by skeletal muscle continued to be reduced during fasting. Glucose utilization also continued to be enhanced in the heart and oxidative skeletal muscle and glucose supply relative to its demand was diminished, resulting in accelerated hypoglycemia. Consequently, available energy substrates from serum and in muscle for exercise performance were very limited in CD36-/- mice during prolonged fasting, which could cause a remarkable reduction in exercise endurance. In conclusion, our study underscores the importance of CD36 for nutrient homeostasis to maintain exercise performance of skeletal muscle when nutrient supply is limited.

Item Details

Item Type:Refereed Article
Keywords:exercise physiology, fasting, fatty acid, glucose, liver, metabolism, skeletal muscle
Research Division:Medical and Health Sciences
Research Group:Cardiorespiratory Medicine and Haematology
Research Field:Cardiology (incl. Cardiovascular Diseases)
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Cardiovascular System and Diseases
UTAS Author:Negishi, K (Dr Kazuaki Negishi)
ID Code:130227
Year Published:2018
Deposited By:Menzies Institute for Medical Research
Deposited On:2019-01-16
Last Modified:2019-01-16
Downloads:0

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