Abstract
Objectives: The aim was to investigate the effects of valsartan on the sarcoplasmic reticulum Ca<sup>2+</sup>-ATPase pump (SERCA) and L-type Ca<sup>2+</sup> channel current (I<sub>CaL</sub>) of the left ventricular myocardium in rats with heart failure with preserved ejection fraction. Methods: The 30-week-old male spontaneously hypertensive rats (SHRs) are randomly divided into the non-Valsartan and Valsartan groups, and the 30-week-old male Wistar-Kyoto rats served as control rats. The expression of SERCA is measured by Western blot. The I<sub>CaL</sub> is measured by whole-cell patch clamp. The left ventricular end-diastolic pressure and left ventricular relaxation time constant quantity are measured at the same time. Results: The left ventricular end-diastolic pressure is much higher in SHRs compared with that in control rats (p < 0.01). The left ventricular relaxation time constant quantity is markedly extended in SHRs compared with control rats (p < 0.01). Valsartan cannot increase the expression of SERCA nor decrease the density of I<sub>CaL</sub> compared with the non-Valsartan group (p > 0.05). Conclusions: Valsartan has no effect on SERCA and I<sub>CaL</sub> of the left ventricular myocardium in rats with heart failure with preserved ejection fraction.
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