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Astragalosides Rescue Both Cardiac Function and Sarcoplasmic Reticulum Ca 2+ Transport in Rats with Chronic Heart Failure
Author(s) -
Wang Yi,
Ji Yansu,
Xing Yongfa,
Li Xiang,
Gao Xiumei
Publication year - 2012
Publication title -
phytotherapy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.019
H-Index - 129
eISSN - 1099-1573
pISSN - 0951-418X
DOI - 10.1002/ptr.3492
Subject(s) - phospholamban , serca , heart failure , endoplasmic reticulum , medicine , cardiac function curve , ventricle , contractility , endocrinology , calcium atpase , cardiology , chemistry , atpase , biochemistry , enzyme
The study investigated the beneficial effects of astragalosides (AS) on cardiac performance in rats with chronic heart failure. Chronic heart failure was produced by left anterior descending coronary artery ligation, and the therapeutic efficacy of astragalosides at 10, 20 and 40 mg/kg was evaluated. Five weeks after the operation, cardiac function was deficient and sarcoplasmic reticulum Ca 2+ ‐ATPase (SERCA) activity was significantly reduced. Moreover, SERCA mRNA decreased, while expression of the SERCA down‐regulator phospholamban (PLB) was significantly increased. Phosphorylated phospholamban (P‐PLB), the form that does not inhibit SERCA, was also reduced by chronic heart failure. Treatment with AS improved left ventricle function and cardiac structure, reversed the depression of SERCA activity, and increased P‐PLB. These results suggest that the cardioprotective effect of AS may be due to the increase in P‐PLB protein, which disinhibits SERCA activity. Rescue of sarcoplasmic reticulum Ca 2+ cycling by astragalosides could normalize excitation–contraction coupling and improve overall cardiac function. Copyright © 2011 John Wiley & Sons, Ltd.