ラットの赤筋ならびに白筋線維に対する除神経の影響に関する組織化学的研究　II. Phosphorylase活性について

概要

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The effect of denervation on the white, red and intermediate fibers of rat leg muscle was studied histochemically with phosphorylase (PhR) staining. The following results were obtained. 1) From a standpoint to PhR activity, it was confirmed that normal tibialis anterior is composed of three different types of fibers; white, reel and intermediate fibers. 2) In the cross-section of individual fibers, a reticular structure (network) which outlined the individual myofibrils was observed. Size of the area outlined by the network, i. e., size of the myofibrils was larger in the circler of red>white>intermediate fibers. 3) Following denervation, PhR activity of these three types of fibers decreased very rapidly, although a certain difference between the decrease of the activity of three types of fibers was observed. The change in the PhR activity was found to be more marked in the white fibers than that of the other two. 4) The network in the individual fibers changed with time following denervation; the size of area outlined by the network became smaller and then the network gradually disappeared. These changes were observed more markedly in white fibers than those of the other two. From these results, the problems on the relations between the metabolism and the maintenance of structure and between the denervation and the dedifferentiation were discussed.
1977-08-01