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A new cardioprotective agent, JTV519, improves defective channel gating of ryanodine receptor in heart failure

A new cardioprotective agent, JTV519, improves defective channel gating of ryanodine receptor in heart failure

American Journal of Physiology. Heart and Circulatory Physiology 284(3): H1035-H1042

Defective interaction between FKBP12.6 and ryanodine receptors (RyR) is a possible cause of cardiac dysfunction in heart failure (HF). Here, we assess whether the new cardioprotective agent JTV519 can correct it in tachycardia-induced HF. HF was induced in dogs by 4-wk rapid ventricular pacing, and sarcoplasmic reticulum (SR) was isolated from left ventricular muscles. In failing SR, JTV519 increased the rate of Ca(2+) release and [(3)H]ryanodine binding. RyR were then labeled in a site-directed fashion with the fluorescent conformational probe methylcoumarin acetamide. In failing SR, the polylysine induced a rapid change in methylcoumarin acetamide fluorescence, presumably because the channel opening preceding the Ca(2+) release was smaller than in normal SR (consistent with a decreased rate of Ca(2+) release in failing SR), and JTV519 increased it. In conclusion, JTV519, a new 1,4-benzothiazepine derivative, corrected the defective channel gating in RyR (increase in both the rapid conformational change and the subsequent Ca(2+) release rate) in HF.

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Accession: 045079181

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PMID: 12433661

DOI: 10.1152/ajpheart.00722.2002

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