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- ArticleSims JM, Patzer B, Kumudavalli-Reddy M, Martin AF, Rabinowitz M, Zak R.Recent Adv Stud Cardiac Struct Metab. 1976 May 26-29;12:19-28.The half-life of cardiac myosin heavy chains (HC) was determined, with leucyl-tRNA as precursor, to be 5.4 days. Myosin HC are labeled more rapidly than actin; myosin light chains (LC1 and LC2) are labeled more slowly than HC. The observed differences are attributable to heterogeneity in the half-lives, e.g., actin, and to the effect of dilution by the existing macromolecular precursor pool (LC1 and LC2). Cardiac and skeletal muscle contain a population of filaments that can be released from myofibrils by ATP-relaxing solution. The easily released filaments (ERF) are devoid of alpha-actinin and M-protein. Labeling of ERF is more rapid than that of residual myofibrils. Cardiac and skeletal muscle contains calcium-activated neutral protease, which selectively removes alpha-actinin when incubated with isolated myofibrils. During development of pressure-induced cardiac hypertrophy, the labeling of LC2 is increased. In regressing cardiac hypertrophy the activities of free and total cathepsin D and of acidic RNase are unaltered.