复方芪苓配方颗粒对尿酸性肾病模型大鼠作用机制研究

目的研究复方芪苓配方颗粒降尿酸及改善肾功能的作用机制。方法 60只雄性SD大鼠按随机数字表法分为复方芪苓配方颗粒高剂量组(9.6g·kg-1·d-1)、中剂量组(4.8g·kg-1·d-1)、低剂量组(2.4g·kg-1·d-1),别嘌醇组(10.5mg·kg-1·d-1),正常对照组,模型对照组,每组10只。采用灌胃腺嘌呤联合腹部皮下注射氧嗪酸钾制备大鼠尿酸性肾病模型,连续造模2周。造模成功后各组给予相应药物灌胃,正常及模型对照组以等体积蒸馏水灌胃,连续给药2周。分别采用肌氨酸氧化酶法、尿素酶法、尿酸酶法测定其血清肌酐、尿素、尿酸,化学比色法测定肝脏黄嘌呤氧化酶,免疫组化检测肾脏组织有机阴离子转运体1(OAT1)、尿酸盐转运体1(URAT1)、有机阳离子转运体2(OCT2)的表达。结果与模型对照组比较,复方芪苓配方颗粒高、中、低剂量组尿酸性肾病模型大鼠血清尿酸水平显著降低[(107.80±9.27)μmol/L、(119.31±10.63)μmol/L、(129.41±9.27)μmol/L比(178.00±10.84)μmol/L,P<0.01];复方芪苓配方颗粒高、中剂量组血清肌酐、尿素水平显著降低[(51.00±5.30)μmol/L、(57.65±10.36)μmol/L比(101.67±9.84)μmol/L,(12.43±1.09)μmol/L、(18.37±2.41)μmol/L比(29.35±4.59)μmol/L,P<0.01];复方芪苓配方颗粒高、中剂量组肝脏黄嘌呤氧化酶明显降低[(38.38±3.85)U/L、(39.09±4.39)U/L比(45.90±5.02)U/L,P<0.05];复方芪苓配方颗粒高剂量组肾脏OAT1蛋白的表达显著上调[(636786.94±46980.65)比(330652.32±36608.14),P<0.01],且其高、中剂量组OCT2蛋白的表达显著上调[(698162.61±24727.35)、(668148.15±39230.42)比(462729.95±34117.12),P<0.01],URAT1蛋白的表达显著下调[(33202.67±2481.30)、(63795.48±5177.65)比(159163.58±16016.05),P<0.01]。结论复方芪苓配方颗粒能降低尿酸性肾病模型大鼠血清肌酐、尿素、尿酸水平,其作用机制可能与降低大鼠肝脏黄嘌呤氧化酶活性,上调大鼠肾脏OAT1、OCT2水平,下调URAT1水平,从而抑制尿酸生成、并通过增加尿酸盐的分泌及降低肾脏尿酸盐重吸收能力促进尿酸排泄相关。

Research on the Mechanism of Compound Qiling Formula Granules in Reducing Uric in Rats with Uric Acid Nephropathy

Objective To study the mechanism of compound Qiling formula granules on reducing uric acid and improving renal function in the model of rats with uric acid nephropathy, which were induced by potassium oxyzinate and adenine. Methods The SD rats were randomly divided into normal group, model group, allopurinol group and high, medium and low dose group of compound Qiling formula granules. The levels of serum uric acid (UA), creatine (Scr), urea and liver xanthine oxidase (XOD) were tested respectively. The expression of organic anion transporter 1 (OAT1), uric acid transporter (URAT1) and organic cation transporter 2 (OCT2) were detected by immunohistochemistry. Results Compared with model group, the levels of UA, Scr and Urea of the rats with uric acid nephropathy in the groups of compound Qiling formula granules were significantly lowered; the levels of liver XOD in high and medium dose group of compound Qiling formula granules were reduced obviously, the expressions of OAT1 and OCT2 were up-regulated and the expressions of URAT1 were down-regulated significantly. Conclusion Compound Qiling formula granules can lower the levels of UA, Scr and Urea of the rats with uric acid nephropathy. Its mechanism may be related to the decrease of liver XOD activity, the up-regulation of OAT1&OCT2 and the down-regulation of URAT1 in the kidney of rats, thus decreasing the uric acid formation, increasing the secretion of urate and reducing the renal urate reabsorption capacity to promote the uric acid excretion.