Objective To observe the effect of Chinese yam polysaccharide on the expression of hypoxia inducible factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF) in rats with renal ischemia reperfusion injury. Methods SD rats were randomly divided into sham operation group, model group and Chinese yam polysaccharide group. Renal ischemia reperfusion injury model in rats was prepared. Seven days before operation, Chinese yam polysaccharide group was gastrically administrated with yam polysaccharide (200 mg/kg) daily, sham operation group and model group with same volume of saline respectively. BUN and SCr were detected postoperative 6 h, the protein expression of HIF-1αin renal tissue was detected by Western Blot, and HIF-1αand VEGF mRNA expression in renal tissue were detected by RT-PCR. Results Compared with sham operation group, serum levels of BUN and SCr of model group and Chinese yam polysaccharides group increased (P<0.01), and the mRNA and protein expression of HIF-1α, mRNA expression of VEGF in renal tissue increased (P<0.01). Compared with model group, serum levels of BUN and SCr of Chinese yam polysaccharide group decreased (P<0.01), and HIF-1α mRNA and protein expression, VEGF mRNA expression in renal tissue increased (P<0.01). Conclusion Chinese yam polysaccharide has obvious protective effect on renal ischemia reperfusion injury, which may be related with up-regulation of HIF-1αexpression and induction of VEGF expression.

Objective To discuss the mechanism of Liuwei Dihuang Decoction against renal interstitial fibrosis. Methods The rat models of renal interstitial fibrosis were induced by 5/6 nephrectomy, and were randomly divided into sham-operation group, model group, Liuwei Dihuang Decoction group and enalapril group. Liuwei Dihuang Decoction group was given 6.25 g/(kg?d) of Liuwei Dihuang Decoction for gavage, enalapril group was given 10 mg/(kg?d) enalapril for gavage, sham-operation group and model group were given 10 mL/(kg?d) of distilled water for gavage, 1 time per day for 12 weeks. Expressions of HIF-1α, CollI, and CollIII in kidney tissue were detected by immunohistochemistry. Results Compared with the sham-operation group, the expressions of HIF-1α, CollI, and CollIII of renal tissue in the model group significantly increased (P<0.05). Compared with the model group, Liuwei Dihuang Decoction group and enalapril group can inhibit the expressions of HIF-1α, CollI, and CollIII (P<0.05), and Liuwei Dihuang Decoction group was better than enalapril group (P<0.05). Conclusion The mechanism of Liuwei Dihuang Decoction against renal interstitial fibrosis may improve the renal tissue of chronic hypoxia to play the role of preventing renal interstitial fibrosis by decreasing the expressions of HIF-1α, CollI, and CollIII.

Aiming at the deficiency in pathology in many TCM universities and colleges we should reform and actively explore the teaching methods,which will be significant to improving the teaching quality of pathology in TCM universities and ensuring the positive teaching effect.