摘要:
Objective To explore the protective effects and possible mechanisms of hesperetin against isoproterenol (ISO)-induced heart failure (HF) in rats.Methods Forty Sprague-Dawley (SD) rats were randomly divided into four groups:control group(group C),hesperetin group (group H),isoproterenol group (group Ⅰ)and H+ Ⅰ group (group T).Rats in group Ⅰ and group T were subcutaneously injected with ISO (150 mg/kg) once a day for 2 consecutive days.The model was successfully established in heart failure was determined by echocardiography after 2 weeks.Hesperetin was administered at the dosage of 100 mg/kg,po by gavage for a period of 10 days in group H and group T.Cardiac function of all rats including left ventricular end-diastolic diameter (LVEDD),left ventricular end-systolic dimension (LVESD),left ventricular ejection fractions (EF),left ventricular fractional shortening (FS) was assessed by echocardiography.Collecting serum of all rats,malondialdehyde (MDA),superoxide dismutase (SOD),total antioxidant capacity (TAOC) were detected by thiobarbiturieacid colorimetry,WST-1 method and colorimetry method respectively.Results There was not obvious changes of cardiac function in group C and group H.ISO inhibited the cardiac function of rats significantly including LVESD,EF,as well as FS,compared to group C(P <0.05).LVESD was increased while EF and FS were decreased.The level of MDA in group Ⅰ was significantly higher (P <0.05) while the levels of SOD and TAOC were significantly lower than group C (P <0.05).Hesperetin attenuated the effect of heart failure induced by ISO.Cardiac function of rats including LVESD,EF,as well as FS was improved in group T compared to group Ⅰ (P <0.05).LVESD was declined,EF and FS were ascended.The level of MDA was significantly lower,the levels of SOD,TAOC in group T were significantly higher than that in group Ⅰ (P <0.05).Conclusion Hesperetin can attenuate ISO-induced heart failure in rats.Its possible mechanisms may be associated with regulating oxidative stress.%目的 观察橙皮素对大剂量异丙基肾上腺素(ISO)诱导大鼠心衰的保护作用,并探讨其机制.方法 将SD大鼠随机分为正常(C)组、橙皮素对照(H)组、异丙基肾上腺素(Ⅰ)组和橙皮素治疗+Ⅰ(T)组,l组和T组接受皮下注射大剂量ISO(150 mg/kg),2周后行超声心动图检测.确定造模成功后,H组及T组给予橙皮素(100 mg/kg)灌胃,Ⅰ组给予等量的溶剂乙醇,连续给药10d后测定各组大鼠心脏功能包括左室舒张末期内径(LVEDD)、左室收缩末期内径(LVESD)、左室射血分数(EF)、左室缩短分数(FS)变化及血清丙二醛(M DA)、超氧化物歧化酶(SOD)、总抗氧化能力(TAOC)的变化,观察各组大鼠心肌的病理变化.结果 与C组比较,I组LVEDD变化不大,LVESD值增大、EF、FS降低,氧化应激指标中MDA值升高,SOD、TAOC降低,备指标差异有统计学意义(P<0.05);与I组比较,T组大鼠LVEDD无明显变化,LVESD降低,EF、FS升高,血清MDA值降低,SOD、TAOC升高,各指标差异有统计学意义(P<0.05).H组各指标较C组无明显变化.结论 橙皮素可能通过减轻氧化应激,降低MDA,升高SOD、TAOC,从而改善心衰大鼠的心脏功能.