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. 2000 Nov 15;352(Pt 1):61–70.

Calcineurin regulates ryanodine receptor/Ca(2+)-release channels in rat heart.

A Bandyopadhyay 1, D W Shin 1, J O Ahn 1, D H Kim 1
PMCID: PMC1221432  PMID: 11062058

Abstract

The present study was undertaken to examine the physical and physiological interaction of protein phosphatase 2B, calcineurin, with the ryanodine receptor (RyR) in rat cardiac tissue and neonatal cardiomyocytes. The presence of calcineurin, the RyR and FK506-binding protein (FKBP)12.6 in rat cardiac sarcoplasmic reticulum (SR) was identified by Western blot analysis. The possible interactions between calcineurin, the RyR and FKBP12.6 were further studied by co-immunoprecipitation using CHAPS-solubilized cardiac-membrane fractions (CSMFs) or SR preparations. Physical interactions between the RyR and calcineurin were found in the CSMF in the presence of added 100 microM Ca(2+); however, the interactions were interrupted in the presence of 20 mM EGTA, 1 microM rapamycin or 1 microM FK506, suggesting that the interaction is Ca(2+)-dependent, and is mediated by FKBP12.6. The Ca(2+)-dependent interaction between FKBP12.6 and the RyR was also found by co-immunoprecipitation. Effects of calcineurin inhibitors were tested on neonatal-rat-heart cardiomyocytes. Treatment of neonatal cardiomyocytes with 20 microM deltamethrin, 10 microM cyclosporin A (CsA), or 10 mciroM FK506 led to Ca(2+) oscillations in originally quiescent cardiomyocytes. Preincubation of cardiomyocytes with 20 microM rapamycin which dissociates FKBP12.6 from the RyR, evoked Ca(2+) oscillations, probably due to the leakiness of the RyR. However, Ca(2+) oscillations by rapamycin were not further affected by 10 microM CsA or 10 mciroM deltamethrin, suggesting that only RyR-associated calcineurin could regulate the channel activities. In spontaneously Ca(2+)-oscillating cardiomyocytes, CsA or FK506 treatments increased the frequency of oscillations. In 10 microM ryanodine-treated cardiomyocytes, CsA failed to induce Ca(2+) oscillations. These data show evidence that calcineurin associated with the RyR could modulate Ca(2+) release in rat heart.

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Selected References

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