Abstract
Myosin isozyme pattern in adult rat cardiac ventricular muscle cells in longterm culture was investigated. The myosin isozymes profile of cultured cardiac myocytes underwent a change in a serum-containing medium from two weeks onward, showing an embryonic rat ventricular myosin isozymes pattern that contained predominant isozyme V3. When adult cardiac myocytes were grown in a serum-containing medium supplemented with T 4, these cells contained a predominant V1 band whose electrophoretic mobility and Ca 2+-ATPase activity were comparable to those of the adult rat ventricle in vivo . This study has demonstrated that the adult cardiac ventricular muscle cells in long-term culture contain a predominant myosin isozyme V3 unlike their counterparts in vivo . Supplemented T 4 modulated the embryonic type isozyme V3 to the adult type V1.
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