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Am J Physiol Cell Physiol 275: C200-C207, 1998;
0363-6143/98 $5.00
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Vol. 275, Issue 1, C200-C207, July 1998

Ca2+-sensitizing effects of the mutations at Ile-79 and Arg-92 of troponin T in hypertrophic cardiomyopathy

Sachio Morimoto1, Fumi Yanaga1, Reiko Minakami2, and Iwao Ohtsuki1

1 Department of Clinical Pharmacology, Faculty of Medicine, and 2 School of Health Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812, Japan

Several mutations in human cardiac troponin T (TnT) gene have been reported to cause hypertrophic cardiomyopathy (HCM). To explore the effects of the mutations on cardiac muscle contractile function under physiological conditions, human cardiac TnT mutants, Ile79Asn and Arg92Gln, as well as wild type, were expressed in Escherichia coli and exchanged into permeabilized rabbit cardiac muscle fibers, and Ca2+-activated force was determined. The free Ca2+ concentrations required for tension generation were found to be significantly lower in the mutant TnT-exchanged fibers than in the wild-type TnT-exchanged fibers, whereas no significant differences were found in tension-generating capability under maximal activating conditions and in cooperativity. These results suggest that a heightened Ca2+ sensitivity of cardiac muscle contraction is one of the factors to cause HCM associated with these TnT mutations.

hypertrophy; missense mutation; skinned fibers; calcium sensitivity; heart diseases; ischemia


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