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  • Title: Experimental investigations on hypokinesis of skeletal muscles with different functions, III. Changes in protein fractions of subcellular components.
    Author: Takács O, Sohár I, Pelle T, Guba F, Szilágyi T.
    Journal: Acta Biol Acad Sci Hung; 1977; 28(2):213-9. PubMed ID: 605714.
    Abstract:
    Changes occurring in the protein fractions of rabbits' immobilized skeletal muscles with different functions were studied. Disuse of the muscles resulted in a gradual reduction in the contractile proteins. The specific proteins of the tonic muscle (m. soleus) were degraded to a greater extent than those of the tetanic (white) muscles (m. gastrocnemius). Parallel with the decrease in the structural proteins the sarcoplasmic protein exhibited a relative increase. The tonic muscles underwent greater damage than the tetanic muscles, indicating that the dedifferentiation was more marked in the tonic muscle. The results are explained by the biological importance of the function and activity of the cell: disuse leads to changes in the physiological and biochemical characteristics of the muscle, and to dedifferentiation of the cells.
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