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Journal of Applied Physiology, Vol 48, Issue 1 23-28, Copyright © 1980 by American Physiological Society
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D. A. Krieger, C. A. Tate, J. McMillin-Wood and F. W. Booth
We slightly modified an existing procedure (Palmer et al., J. Biol. Chem. 252: 8731-8739, 1977) to isolate two distinct populations of mitochondria from rat skeletal muscle; initial brief Polytron homogenization released the subsarcolemmal mitochondria, and brief exposure of the resultant intact myofibrils to the proteolytic enzyme, Nagarse, extracted the intermyofibrillar mitochondria. The intermyofibrillar mitochondria differed from the subsarcolemmal mitochondr. ia by higher state III respiration measurements and enzymatic activities. These two populations of mitochondria were then isolated from the gastrocnemius muscle that had been induced to perform different amounts of contractile activity. The endurance training program of daily running significantly increased state III respiration and respiratory control index in the subsarcolemmal mitochondria, but the program did not increase these measurements in the intermyofibrillar mitochondria. In addition, 2 days of hindlimb immobilization resulted in a significant decrease in state II respiration and the respiratory control index of the subsarcolemmal mitochondria; however, immobilization did not affect the intermyofibrillar mitochondria. These measurements suggest that the subsarcolemmal mitochondria adapt in response to chronic changes in the level of contractile activity.
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