Summary
Colchicine was intraperitoneally administered chronically to adult male Sprague-Dawley rats. The ultrastructural study of hind-limb muscles revealed that myofilament desorientation resulted. Bundles of myofilaments were found coursing perpendicular or oblique to the longitudinal axis of the muscle fiber. It is concluded that a colchicine-sensitive factor is involved in maintaining normal orientation of myofibrils in mature muscle. Also found in the sarcoplasm of the colchicine treated animals were complex spheromembranous bodies. These bodies enveloped mitochondria or other organelles and appeared to be derived from the sarcoplasmic reticulum. The lysosomal nature of these bodies is indicated by the localization of acid phosphatase activity in them. Acid phosphatase activity was also displayed in the sarcoplasmic reticulum. The spheromembranous bodies seem to be part of a sarcotubulo-lysosomal system in skeletal muscle.
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This study was supported in part by N.I.H. Grant RR-5576.
The author gratefully acknowledges the technical assistance of Mrs. Patricia Driscoll.
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Seiden, D. Effects of colchicine on myofilament arrangement and the lysosomal system in skeletal muscle. Z.Zellforsch 144, 467–473 (1973). https://doi.org/10.1007/BF00307374
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DOI: https://doi.org/10.1007/BF00307374