Summary
Cross-union of the tibial with the pudendal nerve innervating the androgen-sensitive levator ani (LA) muscle of male rats, results in reversal of the histochemical muscle fibre pattern concerning myofibrillar ATPase, succinate dehydrogenase and phosphorylase enzyme activities. The homogeneous muscle fibre pattern of the LA muscle is changed to a mosaic pattern of muscles normally innervated by the tibial nerve. The success of the hetero-reinnervation is shown by practically full recovery of muscle weight and of isometric twitch-contraction properties of the LA muscle. Castration of 2-months duration, i. e. lack of the male sex hormone, leads to marked atrophy but no change in histochemical muscle fibre pattern. Hetero-reinnervation of the LA muscle results in change of histochemical enzyme pattern even if the cross-union of nerves is performed after long periods of castration leading to very marked decrease of muscle fibre size. However, testosterone application alone after castration increases markedly muscle fibre size but does not lead to reversal of muscle fibre pattern. The myotropic hormonal influence on the target (LA) muscle is therefore primarily of myogenic origin and specificity of hormonal action is maintained even with a foreign nerve innervating the muscle. The experiments, thus, provide evidence for the differentiation of specific neural influences affecting muscle fibre pattern and hormonal influences in respect to the myotropic action of the sex hormone on the androgen-sensitive LA muscle.
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Hanzlíková, V., Gutmann, E. Effect of foreign innervation on the androgen-sensitive levator ani muscle of the rat. Z. Zellforsch. 135, 165–174 (1972). https://doi.org/10.1007/BF00315124
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DOI: https://doi.org/10.1007/BF00315124