Valsartan Reduces Left Ventricular Hypertrophy in Ovariectomized Spontaneous Hypertensive Rats

Abstract

Abstract Objective To investigate the effects of valsartan on left ventricular mass, function, and oxidative stress in ovariectomized spontaneous hypertensive rats (SHR). Methods Twelve-week-old female SHRs were randomly divided into ovariectomy (OVX) control (n = 12), OVX + valsartan (n = 12), sham control (Sham, n = 13), and Sham + valsartan (n = 14) groups. Valsartan (30 mg/kg/day) or double-distilled water was given by oral gavage. After 12 weeks of valsartan or water treatment, left ventricular wall thickness and function, superoxide dismutase (SOD), glutathione peroxidase (GSH), and 8-hydroxydeoxyguanosine (8-OHdG) were assessed. Results There was a significant interaction between ovariectomy and valsartan on interventricular end-diastolic septum thickness (IVSTd), end-systolic interventricular septum thickness (IVSTs), left ventricular end-diastolic posterior wall thickness (LVPWTd), and left ventricular end diastolic diameter (LVEDD) (P < 0.05). Valsartan treatment in OVX rats decreased IVSTd, IVSTs, LVPWTd, and LVPWTs compared to OVX control (P < 0.05). Compared with Sham + control group, LVESP and ±dP/dt of LV were decreased while LVEDP was increased in OVX + control group (all P < 0.05). After valsartan treatment, LVESP and ±dP/dt of LV were increased and LVEDP was decreased in ovariectomized rats (all P < 0.05). Ovariectomy decreased GSH and SOD levels and increased 8-OHdG levels, which were reversed by valsartan treatment (all P < 0.05). Conclusion Valsartan treatment decreases oxidative stress, reduces LV hypertrophy, and improves cardiac function in overiectomized SHR.