Seasonal biochemical plasticity of a flight muscle in a bat, Murina leucogaster.
Kim, MH; Park, K; Gwag, BJ; Jung, NP; Oh, YK; Shin, HC; Choi, IH
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 126(2):245-250, 2000
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
Cellular and biochemical responses of the pectoral muscle to variation in seasonal activity were studied in the bat, Murina leucogaster ognevi. We collected bats in mid-hibernation (February), end-hibernation (April), and mid-summer (August) to track major activity periods in their annual cycle. Our findings indicated that myofiber cross-sectional area decreased to 68% between mid- and end-hibernation, but returned to the winter level in mid-summer. Total soluble protein and total RNA concentrations were not altered over these sampling periods. Oxidative potential gauged by citrate synthase activity increased 1.47-fold from mid- to end-hibernation and then remained at the similar level in mid-summer. Glycolytic potential gauged by lactate dehydrogenase activity changed little between mid- and end-hibernation but increased 1.42-fold in summer, compared with the winter level. Thus, the myofibers underwent disuse atrophy during hibernation, while enzymatic catalytic function recovered towards the level of mid-summer.
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