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(Circulation. 2002;105:1374.)
© 2002 American Heart Association, Inc.
Basic Science Reports |
From the Department of Medical Bioregulation, Division of Cardiovascular Medicine, Yamaguchi University School of Medicine, Yamaguchi, Japan.
Correspondence to Masunori Matsuzaki, MD, PhD, Department of Internal Medicine, Yamaguchi University School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi, 755-8505, Japan. E-mail masunori{at}po.cc.yamaguchi-u.ac.jp
Background In heart failure, protein kinase A-mediated hyperphosphorylation of ryanodine receptors (RyRs) in sarcoplasmic reticulum (SR) causes dissociation of FKBP12.6 from RyRs. This results in an abnormal Ca2+ leak through RyRs, possibly leading to cardiac dysfunction. In the present study, we assess whether ß-blockers can correct this defect in RyR in tachycardia-induced heart failure and thereby improve cardiac function.
Methods and Results SRs were isolated from dog left ventricular muscles (normal group, 4 weeks of rapid right ventricular pacing with or without propranolol [P(+) or P(-)]). End-diastolic and end-systolic diameters both increased less in P(+) than P(-), associated with a smaller decrease in fractional shortening in P(+). In SR from P(-), a prominent Ca2+ leak was observed, and FK506 (which dissociates FKBP12.6 from RyR) did not induce an additional Ca2+ leak. However, there was no appreciable Ca2+ leak in SR from P(+), although FK506 induced a Ca2+ leak as in normal SRs. In SR from P(+), an FK506-induced conformational change in RyR, which was virtually absent in SR from P(-), was observed as in normal SRs. Both the stoichiometry of FKBP12.6 versus RyR, assessed by [3H]FK506 and [3H]ryanodine binding assays, and the protein expression of FKBP12.6, assessed by Western blot analysis, were restored by propranolol toward the levels seen in normal SRs.
Conclusions Low-dose propranolol corrects the defective interaction of FKBP12.6 with RyR (restoration of RyR conformational change and prevention of Ca2+ leak from RyR), apparently resulting in an attenuation of intracellular Ca2+ overload and hence preventing the development of left ventricular remodeling in heart failure.
Key Words: ß-blocker heart failure sarcoplasmic reticulum calcium
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