ABSTRACT
Objective: Study on the mechanism of Tongfengning in reducing serum uric acid from the perspective of renal urate transporter. Method: The human renal tubular epithelial cells(HK-2)was randomly divided into normal group, model group, Tongfengning low, medium and high dose group (7.65,15.3,30.6 g·kg-1) and benzbromarone group (50 μmo1·L-1),different culture media were given for intervention.HK-2 and cell supernatant were collected after 24 h of intervention. The expressions of urate transporter 1 (URAT1), glucose transporter 9 (GLUT9), organic anion transporter 1(OAT1), organic anion transporter 3(OAT3), and ATP-binding cassette superfamily G member 2 (ABCG2) protein and mRNA were detected in HK-2 of all groups by Western blot and Real-time PCR. Result: Compared with normal group, the expression of URAT1, GLUT9 protein and mRNA was significantly increased(PPPPPConclusion: Tongfengning can regulate the reabsorption and secretion of uric acid in renal tubules, promote the excretion of uric acid in kidney and reduce the level of serum uric acid by down-regulating the expression of URAT1, GLUT9 protein and mRNA in HK-2 and up-regulating the expression of ABCG2 protein and mRNA. It is suggested that the regulation of renal uric acid transporter protein may be one of the specific mechanisms of Tongfengning to reduce serum uric acid by promoting dampness and turbid removal. OAT1, OAT3 protein and mRNA were not expressed in HK-2 cultured in vitro.