ABSTRACT
Objective:To observe the effect of blood stasis syndrome on renal damage and endoplasmic reticulum stress (ERS) in diabetic kidney disease (DKD) rats, and to explore the relationship between renal syndrome of blood stasis damage and ERS in DKD rats. Method:The 50 Male SD rats of SPF level were selected to establish DKD rat model by high fat and high sugar diet combined with intra-abdominal injection of streptozotocin(STZ). They were randomly divided into normal group, diabetes mellitus group and diabetes mellitus and blood stasis syndrome group（0.05 mg·kg-1）, among which diabetes mellitus and blood stasis syndrome group was prepared by dextran method. The general conditions, hemorheology indexes, 24 h urine protein, serum creatinine and renal pathology of the rats in each group were observed. Immunohistochemical analysis, Western blot and Real-time fluorescent quantitative polymerase chain reaction(Real-time PCR)were used to detect mRNA and protein expressions of endoplasmic reticulum stress-related proteins glucose regulated protein 78(GRP78), activating transcription factor-6(ATF6) and renal fibrosis index fibronectin(FN), and alpha smooth muscle actin(α-SMA). Result:Compared with normal group, the rats in diabetes mellitus group showed polyphagia, polyuria and weight loss, increased hemorheology index of whole blood viscosity and plasma viscosity(P<0.05，P<0.01), increased 24 h urine protein, serum creatinine and urea nitrogen(P<0.01), and increased renal pathology, and increased mRNA and protein expression of GRP78, ATF6, FN and α-SMA(P<0.05，P<0.01). After dextran preparation of blood stasis model. Diabetes mellitus and blood stasis syndrome group increased mortality, signs of change is more obvious in the diabetic group, whole blood viscosity, plasma viscosity, 24 h urine protein ration, serum creatinine and urea nitrogen were significantly higher than those in diabetic rats(P<0.01), pathological changes aggravated in the diabetes group. At the same time， mRNA and protein expressions of GRP78, ATF6, FN, and α-SMA in renal tissue were significantly higher than those in diabetic mellitus group(P<0.05，P<0.01). Conclusion:Under the combined disease and syndrome model, the blood stasis syndrome may further aggravate the pathological damage of the kidney of DKD rats, and is related to the enhancement of ERS in the kidney of DKD rats.