期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 221, 期 22, 页码 -出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.182089
关键词
Muscle mechanics; Passive stiffness; Comparative biomechanics; Titin
类别
资金
- National Institutes of Health [R01 AR40050, R24 HD050837]
- Department of Veterans Affairs
Differences in passive muscle mechanical properties between amphibians and mammals have led to differing hypotheses on the functional role of titin in skeletal muscle. Early studies of frog muscle clearly demonstrated intracellular load bearing by titin, but more recent structural and biological studies in mice have shown that titin may serve other functions. Here, we present biomechanical studies of isolated frog and mouse fibers, and fiber bundles to compare the relative importance of intracellular versus extracellular load bearing in these species. Mouse bundles exhibited increased modulus compared with fibers on the descending limb of the length-tension curve, reaching a 2.4-fold elevation at the longest sarcomere lengths. By contrast, frog fibers and bundles had approximately the same modulus at all sarcomere lengths tested. These findings suggest that in the mouse, both muscle fibers and the ECM are involved in bearing whole muscle passive tension, which is distinct from the load bearing process in frog muscle, where titin bears the majority of whole muscle passive tension.
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