Abstract
The present study was designed to investigate the presence of the fatty acid-binding protein (FABPPM) in the plasma membranes of skeletal muscles with different oxidative capacities for free fatty acid (FFA) oxidation during conditions of normal (fed) or increased (fasted) FFA utilization in the rat. Female Sprague-Dawley rats were either fed or fasted for 12, 24, or 48 h and, plasma membranes (PM) fractions from red and white skeletal muscles were isolated. Short-term fasting significantly decreased body weight by 11% and blood glucose concentration by 42% (6.6 ± 0.2-3.8 ± 0.4 mmol/l) and increased plasma FFA concentration by 5-fold (133 ± 14-793 ± 81 µmol/l). Immunoblotting of PM fractions showed that FABPPM protein content was 83 ± 18% higher in red than in white skeletal muscle and correlated with oxidative capacity as measured by succinate dehydrogenase activity (r = 0.78, p < 0.05). Short-term fasting significantly increased FABPPM protein content by 60 ± 8% in red skeletal muscle but no change was measured in white skeletal muscle. These results show that FABPPM protein content in skeletal muscle is related to oxidative potential and can be increased during a physiological condition known to be associated with an increase in FFA utilization, suggesting that cellular expression of FABPPM may play a role in the regulation of FFA metabolism in skeletal muscle. (Mol Cell Biochem 166: 153-158, 1997)
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Turcotte, L.P., Srivastava, A.K. & Chiasson, JL. Fasting increases plasma membrane fatty acid-binding protein (FABPPM) in red skeletal muscle. Mol Cell Biochem 166, 153–158 (1997). https://doi.org/10.1023/A:1006846907394
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DOI: https://doi.org/10.1023/A:1006846907394