雷公藤多甙对抗Thy1.1抗体肾炎蛋白尿和足细胞裂隙膜相关分子表达的影响

Effects of Multi-glycoside of Tripterygium wilfordii Hook.f.on Proteinuria and Expression of Slit Diaphragm-associated Molecules in Rats with Anti-Thy1.1 Glomerulonephritis

目的观察雷公藤多甙(multi-glycoside of Tripterygium wilfordii Hook.f.,GTW)对抗Thy1.1抗体肾炎蛋白尿和足细胞裂隙膜相关分子(nephrin、podocin)表达的影响。方法经尾静脉一次性注射500μg单克隆抗体(monoclonal antibody,mAb)1-22-3建立大鼠抗Thy1.1抗体肾炎模型。14只大鼠随机分为GTW干预组(简称GTW组)和安慰剂干预组(简称造模组)。实验1中,在注射抗体前3天,经灌胃给予GTW〔75mg/(kg.d)〕或安慰剂,直至造模后第14天,处死大鼠;实验2中,在注射抗体同时,经灌胃给予GTW〔100mg/(kg.d)〕或安慰剂,直至造模后第7天,处死大鼠。分别观察14天内或7天内模型鼠24h尿蛋白排泄量(urinary protein excretion,Upro)动态变化。在第14天或第7天,处死大鼠后,取出肾脏,分别观察肾小球形态学变化、肾小球内巨噬细胞浸润、肾小球内nephrin、podocin及其核酸表达。结果实验1中,GTW抑制抗Thy1.1抗体肾炎蛋白尿和系膜损伤,在第14天,对肾小球内nephrin、podocin免疫荧光染色强度无影响;实验2中,GTW改善抗Thy1.1抗体肾炎蛋白尿、系膜损伤、肾小球内巨噬细胞浸润,而且,在第7天,显著增强肾小球内nephrin、podocin及其核酸表达。结论在抗Thy1.1抗体肾炎中,nephrin、podocin表达的减弱可能会促进系膜损伤和蛋白尿。GTW改善系膜损伤和蛋白尿的作用,很可能是通过增强nephrin、podocin表达来实现的。

Objective To examine the effect of multi-glycoside of Tripterygium wilfordii Hook, f. （GTW） on proteinuria and expression of slit diaphragm-associated molecules such as nephrin and podocin in glomerulonephritis induced by anti-Thy1. 1 antibody （anti-Thy1. 1 GN）. Methods Anti-Thy1. 1 GN was induced in rats by a single intravenous injection with 500 μg of anti-Thy1. 1 mAb 1-22-3, Fourteen rats were randomly divided into 2 groups, the GTW-treated group and vehicle treated group, and sacrificed on day 14 in Experiment 1 or on day 7 in Experiment 2 after induction of Anti-Thy1. 1 GN. Daily oral administration of GTW and vehicle as a control was started from 3 days before injection or at the same time of injection to the day of sacrifice in Experiment 1 or 2. Proteinuria was determined during 14 days in Experiment 1 or during 7 days in Experiment 2. From kidneys taken at sacrifice, glomerular morphological changes, glomerular macrophage infiltration, glomerular expression of nephrin and podocin, and its mRNA expression in renal tissue were examined. Results In Experiment 1, proteinuria and mesangial matrix expansion were significantly attenuated by GTW treatment. No difference in staining intensity of nephrin and podocin in glomeruli was observed between GTW treated group and vehicle treated group on day 14. In Experiment 2, GTW treatment significantly ameliorated proteinuria,mesangial injury and activated macrophage infiltration in glomerulus. In addition, it significantly increased the expression of nephrin and podocin and its mRNA expression in glomeruli on day 7. Conclusion In anti-Thy1. 1 GN, the reduced expression of nephrin and podocin may contribute to the development of mesangial injury and proteinuria. The findings suggest that GTW ameliorates not only proteinuria but also mesangial lesions in anti- Thy1. 1 GN most likely by increasing the expression of nephrin and podocin