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Expression of superfast myosin in aneural regenerates of cat jaw muscle
(Med) Mb Bs Phd Joseph F. Y. Hoh Bssc,
BSc (Hons) Suzanne Hughes,
Corresponding Author
(Med) Mb Bs Phd Joseph F. Y. Hoh Bssc
Department of Physiology, University of Sydney, New South Wales, Australia
Department of Physiology, F13, University of Sydney, NSW, 2006, AustraliaSearch for more papers by this authorBSc (Hons) Suzanne Hughes
Department of Physiology, University of Sydney, New South Wales, Australia
Search for more papers by this author(Med) Mb Bs Phd Joseph F. Y. Hoh Bssc,
BSc (Hons) Suzanne Hughes,
Corresponding Author
(Med) Mb Bs Phd Joseph F. Y. Hoh Bssc
Department of Physiology, University of Sydney, New South Wales, Australia
Department of Physiology, F13, University of Sydney, NSW, 2006, AustraliaSearch for more papers by this authorBSc (Hons) Suzanne Hughes
Department of Physiology, University of Sydney, New South Wales, Australia
Search for more papers by this authorAbstract
We investigated whether innervation is necessary for the expression of superfast myosin in regenerating cat jaw-closing muscle. Strips of jaw muscle were permitted to regenerate bilaterally in the beds of a fast limb muscle with innervation on one side being prevented surgically. Immunocytochemical analyses using anti-myosin heavy chain antibodies were done at various times postoperatively, the latest being after 78 days. We found little difference between innervated and uninnervated regenerates up to 27 days postoperatively. All regenerating myotubes expressed fetal myosin. In addition, some myotubes stained for superfast or slow myosin, while others stained for both superfast and slow myosins. Subsequently, uninnervated myotubes became atrophic but continued to express fetal, slow, and superfast myosins while innervated myofibers suppressed fetal and slow myosin expression. These results are consistent with the notion that satellite cells of jaw-closing muscles are committed to express superfast myosin during myogenesis, and that the expression of this program is independent of innervation.
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