Objective: To investigate the effects of panax notoginseng saponins (PNS) on pulmonary vascular remodeling and SIRT1/FOXO3a/p27 pathway in pulmonary arterial hypertension (PAH) rats. Methods: Male SD rats weighing 200~250g were randomly divided into control group, monocrotaline group (MCT) and monocrotaline + panax notoginseng saponins group (MCT+PNS), with 10 rats in each group. The rats in control group were injected intraperitoneally with normal saline 3 ml/kg on the first day, then injected intraperitoneally with normal saline 2.5 ml/kg every day. The rats in MCT group were injected intraperitoneally with MCT 60 mg/kg on the first day, followed by daily injection of normal saline 2.5 ml/kg. In MCT+PNS group, 60 mg/kg MCT was injected intraperitoneally on the first day, and 50 mg/kg PNS was injected intraperitoneally every day. The above models were fed conventionally for 4 weeks. After the modeling was completed, the mean pulmonary artery pressure (mPAP) and right ventricular systolic pressure (RVSP) of rats in each group were detected by right heart catheter method, weighed and calculated right ventricular hypertrophy index (RVHI), and the pulmonary vascular structure and morphological changes were observed by HE and Masson staining. The protein and gene expressions of SIRT1, FOXO3a, p27, PCNA and Caspase-3 were detected by qPCR and Western blot. Results: Compared with control group, mPAP, RVSP and RVHI in MCT group were increased significantly (P＜0.01), pulmonary vessels were thickened significantly and collagen fibers were increased, protein and gene expressions of SIRT1, FOXO3a, p27 and Caspase-3 were decreased (P＜0.05 or P＜0.01). The protein and gene expressions of PCNA were increased (P＜0.05). Compared with MCT group, the levels of mPAP, RVSP and RVHI in MCT+PNS group were decreased significantly (P＜0.05 or P＜0.01), pulmonary vascular thickening was alleviated and collagen fibers were reduced. The protein and gene expressions of SIRT1, FOXO3a, p27 and Caspase-3 were increased (P＜0.05 or P＜0.01), while the protein and gene expressions of PCNA were decreased (P＜0.05 or P＜0.01). Conclusion: Panax notoginseng saponins can relieve pulmonary vascular remodeling in rats with pulmonary hypertension by activating SIRT1/FOXO3a/p27 pathway.
目的: 探讨三七总皂苷(PNS)对肺动脉高压(PAH)大鼠肺血管重构及SIRT1/FOXO3a/p27通路的影响。方法: 将体重200~250 g雄性SD大鼠随机分为对照组(Control),野百合碱组(MCT),野百合碱+三七总皂苷组(MCT+PNS),每组各10只。Control组:第1日腹腔注射生理盐水3 ml/kg,随后每天腹腔注射生理盐水2.5 ml/kg;MCT组:第1日腹腔注射MCT 60 mg/kg,随后每天注射2.5 ml/kg 生理盐水;MCT+PNS组:第1日腹腔注射MCT 60 mg/kg,随后每天腹腔注射PNS 50 mg/kg,常规饲养4周。造模完成后,采用右心导管法检测各组大鼠平均肺动脉压(mPAP)、右心室收缩压(RVSP),称重并计算右心室肥厚指数(RVHI),HE和Masson染色观察肺血管结构和形态变化,qPCR和Western blot检测SIRT1、FOXO3a、p27、PCNA和Caspase-3的蛋白和基因层面的表达变化。结果: 与Control组相比,MCT组mPAP、RVSP和RVHI均显著上升(P＜0.01),肺血管明显增厚以及胶原纤维增多,SIRT1、FOXO3a、p27和Caspase-3蛋白和基因表达均下降(P＜0.05或P＜0.01),PCNA蛋白和基因表达均增多(P＜0.05);与MCT组相比,MCT+PNS组mPAP、RVSP和RVHI显著下降(P＜0.05或P＜0.01),肺血管增厚得到改善以及胶原纤维减少,SIRT1、FOXO3a、p27和Caspase-3蛋白和基因表达均增多(P＜0.05或P＜0.01),PCNA蛋白和基因表达均降低(P＜0.05或P＜0.01)。结论: 三七总皂苷可通过激活SIRT1/FOXO3a/p27通路缓解肺动脉高压大鼠的肺血管重构。.
Keywords: Panax notoginseng saponins; SIRT1 / FOXO3a/p27 pathway; monocrotaline; pulmonary arterial hypertension; rats.