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. 1992 Aug;454:421–434. doi: 10.1113/jphysiol.1992.sp019271

Calcium sensitizing action of carnosine and other endogenous imidazoles in chemically skinned striated muscle.

C Lamont 1, D J Miller 1
PMCID: PMC1175612  PMID: 1474497

Abstract

1. The imidazole-containing compounds carnosine and homocarnosine, endogenous to skeletal and cardiac muscle, have been tested for effect on the contractile behaviour of chemically skinned (saponin or Triton X-100) skeletal and cardiac muscle. 2. Carnosine, at millimolar concentrations which are near physiological for many skeletal fibres, and in a concentration-dependent fashion, shifts the curve relating [Ca2+] to steady-state tension to lower [Ca2+] in both skeletal (frog but not crab) and cardiac (rat) muscle preparations. 3. Of other imidazoles endogenous to heart, homocarnosine is somewhat more effective, while N-acetyl L-histidine is much less so. 4. The maximum level of Ca(2+)-activated force is increased significantly by homocarnosine in cardiac trabeculae. 5. We propose that the cellular imidazoles related to carnosine are natural 'Ca2+ sensitizers' in striated muscle. Alterations in their levels as a result of disease or training, and between different fibre types, may contribute to differences in contractile performance of the intact tissues.

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Selected References

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