Thirty 10-week-old C57BL/6 mice were randomly divided into control group， LIR group， and LIR+Ang-（1-7） group， with 10 mice in each group. The mice in LIR group and LIR+Ang-（1-7） group were subjected to 2 h of ischemia and 4 h of reperfusion to establish the mouse LIR models. The mice in LIR+Ang-（1-7） group were treated Ang-（1-7） （24 μg·kg^－1·h^－1） for two weeks before LIR by placing subcutaneous osmotic pump. The mice in LIR group were treated the same amount of normal saline for two weeks before LIR by placed subcutaneous osmotic pump. Automatic biochemical analyzer was used to determine the levels of serum creatinine （SCr） and urea nitrogen （BUN） of the mice； HE staining was used to observe the pathomorphology of kidney tissue of the mice， and renal tubular pathological score was performed. Enzyme linked immunosorbent assay （ELISA） was used to determine the Ang-（1-7） levels in kidney tissue and serum of the mice. Immunohistochemical staining and Western blotting methods were used to detect the expression， distribution and the expression levels of NF-κB，TNF-α and Mas receptor proteins in the mouse kidney tissue.

Compared with control group， the levels of serum SCr and BUN of the mice in LIR group were increased significantly （P<0.05）， and the obvious pathological damages such as hyperemia， renal tubular dilation， edema， necrosis， and inflammatory cell infiltration were observed in the kidney tissue； the pathological injury score of kidney tissue was increased（P<0.05）； the Ang-（1-7） levels in kidney tissue and serum of the mice were decreased significantly （P<0.05）， and the expression levels of NF-κB， TNF-α and Mas receptor proteins were increased significantly （P<0.05）. Compared with LIR group， the levels of serum SCr and BUN of the mice in LIR+Ang-（1-7） group were decreased significantly （P<0.05），and the kidney congestion and other damages were significantly reduced；the pathological injury score of kindey tissue was decreased（P<0.05）； the Ang-（1-7） levels in kidney tissue and serum of the mice were increased significantly （P<0.05）； the expression levels of NF-κB and TNF-α proteins were decreased （P<0.05）， and the expression level of Mas receptor protein in kidney tissue of the mice in LIR+Ang-（1-7） group was increased significantly （P<0.05）.

Mouse LIR can induce the distal kidney damage， and Ang-（1-7） may reduce the expression levels of NF-κB and TNF-α proteins in kidney tissue to improve the kidney damage caused by mouse LIR.