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Nonuniform expression of myosin heavy chain isoforms along the length of cat intrafusal muscle fibers

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Summary

The expression of four myosin heavy chain (MHC) isoforms, avian slow-tonic (ATO) or neonatal-twitch (ANT) and mammalian slow-twitch (MST) or fast-twitch (MFT) in intrafusal fibers was examined by immunocytochemistry of spindles in the tenuissimus muscle of adult eats. The predominant MHCs expressed by nuclear bag fibers were ATO and MST, whereas the MHCs prevalent in nuclear chain fibers were ANT and MFT. The expression of these isoforms of MHC was not uniform along the length of intrafusal fibers. In general, both bag and chain fibers expressed avian MHC in the intracapsular region and mammalian MHC in the extracapsular region. The nonuniform expression of MHCs observed along the length of bag and chain fibers implies that different genes are activated in myonuclei located in the intracapsular and extracapsular regions of the same muscle fiber. Regional differences in gene activation might result from a greater effect of afferents on myonuclei located near the equator of intrafusal fibers then on myonuclei outside the spindle capsule.

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Authors and Affiliations

  1. Department of Neurology, School of Medicine, Boston University, 80 East Concord Street, 02118, Boston, MA, USA

    J. Kucera

  2. Department of Anatomy, College of Medicine, Northeastern Ohio Universities, 44272, Rootstown, OH, USA

    J. M. Walro

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  1. J. Kucera
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  2. J. M. Walro
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Kucera, J., Walro, J.M. Nonuniform expression of myosin heavy chain isoforms along the length of cat intrafusal muscle fibers. Histochemistry 92, 291–299 (1989). https://doi.org/10.1007/BF00500543

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  • DOI: https://doi.org/10.1007/BF00500543

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