扶正化瘀方对大鼠中毒性肾间质纤维化的作用

Effects of Fuzheng Huayu Recipe on renal toxic interstitial fibrosis in rats

目的:观察扶正化瘀方对大鼠中毒性肾间质纤维化的作用。方法:Wistar大鼠40只,分为正常组、模型组、扶正化瘀方药物组。采用二甲基亚硝胺(dimethylnitlrosamine,DMN)腹腔注射4周和含汞等重金属的饲料喂饲造模8周,制备大鼠肝纤维化-肾间质纤维化模型。药物组以扶正化瘀方自第5周起灌胃,1次／d,共4周。肾组织HE染色及六胺银(periodicacid-silvermetheramine,PASM)染色,观察肾组织炎症与胶原纤维沉积变化;试剂盒方法检测血清尿素氮与肌酐含量,观察肾功能变化;盐酸水解法测定肾组织羟脯氨酸(hydroxyproline,Hyp)含量,观察胶原生成变化。结果:模型大鼠肾小管上皮细胞浊肿、坏死与脱落,炎性细胞浸润;肾间质增宽,大量胶原沉积;肾小管基底膜增厚,出现皱褶;血清尿素氮与肌酐含量上升,肾组织Hyp含量显著增加。扶正化瘀方药物组明显减轻模型大鼠肾小管炎症坏死与肾间质胶原沉积,减轻肾组织Hyp含量,降低异常增高的血清尿素氮与肌酐水平。结论:DMN腹腔注射与汞等重金属饲料口服可造成大鼠肾间质纤维化,扶正化瘀方可明显改善大鼠肾功能,有抗肾间质纤维化的作用。

Objective: To investigate the effects of Fuzheng Huayu Recipe on renal interstitial fibrosis in rats induced by the toxic substances. Methods: Forty Wistar rats were divided into 3 groups, including the normal group, model control and Fuzheng Huayu Recipe treated group. The renal fibrotic model was induced with intraperitoneal injection of dimethylnitrosamine (DMN) for 4 weeks and oral administration of food containing heavy metals such as Hg, etc for 8 weeks. From the 5th week, the rats were orally administered Fuzheng Huayu Recipe for 4 weeks. The renal tissue was stained with HE and periodic acid-silver metheramine, respectively. The serum creatinine and urea nitrogen were assayed with the kits, and the renal hydroxyproline ( Hyp) contents in the homogenate of kidney tissue were measured with HC1 hydrolysis. Results: In the model group, the renal tubule was swollen, and the tubular epithelial cells were degenerated, necrosed and detached, with the infiltration of inflammatory cells; the tubular interstitium was expanded, characterized with the deposition of large collagens; the tubular basement membrane became thicker and wrinkled; and the renal Hyp content and serum creatinine and urea nitrogen levels increased remarkably as compared to the normal group. After the treatment with Fuzheng Huayu Recipe, the renal tubular inflammation and interstitial collagen deposition were alleviated, and the serum creatinine and urea nitrogen levels decreased significantly as compared to the model group. Conclusion: Administration of DMN and heavy metals can induce the renal interstitial fibrosis and impair the renal function. Fuzheng Huayu Recipe can improve the impaired renal functions and reverse the renal interstitial fibrosis.