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Myosin Heavy Chain Expression In Respiratory Muscles Of The Rat.

W. LaFramboise, J. Watchko, B. Brozanski, M. Daood, R. Guthrie
Published 1992 · Biology, Medicine

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Myosin heavy chain (MHC) isoforms of hind limb adult rat muscles and muscles with a range of respiratory activities were analyzed by a sodium dodecyl sulfate polyacrylamide gel electrophoresis technique that allowed electrophoretic separation of the three fast and one slow MHC isoform found in typical rat muscle. Costal and crural diaphragm muscle samples expressed a mixture of MHC beta/slow, MHC2A, and MHC2X but little MHC2B. In contrast, MHC2B was the dominant MHC isoform in the genioglossus, intercostal, and three abdominal muscles, all of which exhibited minimal expression of MHC beta/slow. The amount of MHC2X (relative to total MHC composition) was similar in the diaphragm, genioglossus, and transversus abdominis muscles, while considerably less was detected in the rectus abdominis and external oblique muscles. These results indicate that MHC2X is broadly and variably distributed among respiratory muscles. Furthermore, these data suggest that a large portion of 2X fibers (containing MHC2X), which cannot be detected by standard histochemical analysis, may be present in the genioglossus and transversus abdominis muscles as has been demonstrated for the diaphragm muscle. We speculate that an association exists between the level of MHC2X expression and frequency of respiratory recruitment.
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