枸杞多糖通过调控PI3K/Akt/eNOS信号通路对去卵巢大鼠心肌产生抗氧化作用

目的:观察枸杞多糖对去卵巢大鼠心肌PI3K/Akt/e NOS信号通路的影响。方法:将30只SD雌性大鼠随机分为假手术组、去卵巢组、补佳乐组、枸杞多糖高剂量组及枸杞多糖低剂量组,ELISA法比较各组血清雌激素、LDH及CK水平,检测心肌H_2S含量及氧化应激损伤相关指标,HE染色观察各组心肌的形态变化,Western blot法检测各组大鼠心肌e NOS蛋白及PI3K/Akt通路蛋白的表达。结果:与假手术组相比,去卵巢组大鼠血清雌二醇水平降低,心肌H_2S含量和GSH-Px活性下降,心肌e NOS蛋白及PI3K/Akt通路蛋白的表达均有所降低,心肌ROS活性和MDA含量升高(P0.05),心肌细胞排列紊乱,细胞间隙增大,血清LDH和CK活性均增多;与去卵巢组比较,枸杞多糖高剂量组大鼠血清雌二醇含量增加(P0.05),心肌H_2S含量、GSH-Px活性、e NOS蛋白及Akt磷酸化水平均提高,心肌ROS活性和MDA含量下降(P0.05),血清LDH和CK活性均降低,并且改善大鼠心肌形态的变化。结论:枸杞多糖可以通过调控PI3K/Akt/e NOS通路改善去卵巢大鼠心脏变化防治绝经后心血管病变。

LBP regulates PI3K/Akt/eNOS signaling pathways in ovariectomized rat myocardium to exert antioxidative effect

AIM: To observe the influence of Lycium barbarum polysaccharide (LBP) on the PI3K/Akt/eNOS signaling pathways in ovariectomized rat myocardium. METHODS: Female SD rats (n=30) were divided into sham operation group, ovariectomized group, progynova group, high-dose LBP group and low-dose LBP group. The serum levels of estradiol, lactate dehydrogenase (LDH) and creatine kinase (CK) were measured by ELISA. The myocardial contents of H₂S and oxidative stress injury-related indicators were also detected. The morphological changes of the myocardium were observed with HE staining. The expression of eNOS and PI3K/Akt pathway-related proteins in the myocardium was determined by Western blot. RESULTS: Compared with sham operation group, the serum level of estradiol, the content of H₂S, the activity of GSH-Px, and the expression of eNOS and PI3K/Akt pathway-related proteins in the myocardium in ovariectomized group were all decreased, and the levels of ROS and MDA in the myocardium were increased (P<0.05). The serum levels of LDH and CK were also increased. The arrangement of the myocardial cells was disordered, and the intercellular space was also increased in the ovariectomized group. Compared with ovariectomized group, the serum level of estradiol, the myocardial levels of H₂S and GSH-Px, and the protein levels of eNOS and phosphorylated Akt were all increased in high dose group, while the levels of ROS and MDA in the myocardium were decreased (P<0.05). The serum levels of LDH and CK were also decreased. The morphological changes of the rat myocardium were improved in high dose group. CONCLUSION: LBP prevents and treats postmenopausal cardiovascular lesions through regulating PI3K/Akt/eNOS signaling pathways in ovariectomized rats.