Add time:08/22/2019         Source:sciencedirect.com

Muscles from the chick, composed primarily of αR, βR, or αW fibers, were compared with regard to whole muscle succinic dehydrogenase (SDH) activity, mitochondrial protein yield, mitochondrial SDH activity, and the ability of isolated mitochondria to oxidize α-glycerol phosphate and β-hydroxybutyrate. Total SDH activity is higher in αR than in βR fibers due primarily to higher specific activity of mitochondrial SDH rather than more mitochondria. Neither type of red fiber can oxidize α-glycerol phosphate, whereas αW fibers exhibit coupled oxidation with this substrate. Apparently this capacity is acquired during transformation of αR to αW fibers. The capacity to perform coupled oxidation with β-hydroxy-butyrate is limited to βR fibers. It is concluded that αR and βR fibers are fundamentally different from each other, and that studies utilizing “red” muscles must account for variable proportions of αR and βR fibers.

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