Abstract
Skeletal muscle fibres, long multinucleated cells, arise by fusion of mononucleated myoblasts to form a myotube that matures into the adult fibre. The two major types of mature fibre, fast and slow fibres, differ physiologically in their rate of isotonic shortening1. At the molecular level these type-specific physiological properties are ascribed to different isoforms of myosin, a major protein involved in shortening2,3. Differentiation of fast and slow fibres seems to be under the control of motoneurones4, and mature fibres are innervated by only one motoneurone. When rat soleus muscle (SOL, a slow muscle) is dually innervated with a fast nerve, it acquires some properties of a fast muscle, that is, low sensitivity to caffeine and high glycogen content5. We report here that in dually innervated soleus muscle the foreign fast nerve induces synthesis of fast isoforms of myosin, but only in the segment of the muscle fibre that is close to the foreign endplate. The localized influence of the nerve endplates suggest that factors controlling the phenotypic expression of the muscle fibre have a short range of activity.
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Salviati, G., Biasia, E. & Aloisi, M. Synthesis of fast myosin induced by fast ectopic innervation of rat soleus muscle is restricted to the ectopic endplate region. Nature 322, 637–639 (1986). https://doi.org/10.1038/322637a0
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DOI: https://doi.org/10.1038/322637a0
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