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Comparison of Properties of Ca2+ Release Channels Between Rabbit and Frog Skeletal Muscles

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Publisher Springer
Specialty Biochemistry
Date 1999 Mar 31
PMID 10098987
Citations 11
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Abstract

Biochemical investigation of Ca2+ release channel proteins has been carried out mainly with rabbit skeletal muscles, while frog skeletal muscles have been preferentially used for physiological investigation of Ca2+ release. In this review, we compared the properties of ryanodine receptors (RyR), Ca2+ release channel protein, in skeletal muscles between rabbit and frog. While the Ryr1 isoform is the main RyR of rabbit skeletal muscles, two isoforms, alpha- and beta-RyR which are homologous to Ryr1 and Ryr3 isoforms in mammals, respectively, coexist as a homotetramer in a similar amount in frog skeletal muscles. The two isoforms in an isotonic medium show very similar property in [3H]ryanodine binding activity which is parallel to Ca2+ -induced Ca2+ release (CICR) activity, and make independent contributions to the activities of the sarcoplasmic reticulum. CICR and [3H]ryanodine binding activities of rabbit and frog are qualitatively similar in stimulation by Ca2+, adenine nucleotide and caffeine, however, they showed the following quantitative differences. First, rabbit RyR showed higher Ca2+ affinity than the frog. Second, rabbit RyR showed higher activity in the presence of Ca2+ alone with less stimulation by adenine nucleotide than the frog. Third, rabbit RyR displayed less enhancement of [3H]ryanodine binding by caffeine in spite of having a similar magnitude of Ca2+ sensitization than the frog, which may explain the occasional difficulty by researchers to demonstrate caffeine contracture with mammalian skeletal muscles. Finally, but not least, rabbit RyR still showed marked inhibition of [3H]ryanodine binding in the presence of high Ca2+ concentrations in the 1 M NaCl medium, while frog RyR showed disinhibition. Other matters relevant to Ca2+ release were also discussed.

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