金雀根、黄芪及其配伍对糖尿病肾脏疾病大鼠JNK/SAPK信号通路的影响

Effects of Caragana sinica roots,Astragali Radix and their combination use on JNK/SAPK signaling pathway in rats with diabetic kidney disease

目的探究金雀根、黄芪及其配伍对糖尿病肾脏疾病(DKD)模型大鼠肾脏保护作用及机制。方法将60只SD大鼠随机分为正常组、模型组、恩格列净组(10 mg/kg)、金雀根组(3.1 g/kg)、黄芪组(3.1 g/kg)、金雀根加黄芪组(6.2 g/kg),除正常组外,各组大鼠行左侧肾摘除手术并腹腔注射链脲佐菌素(STZ,35 mg/kg)建立DKD模型,各组分别给予相应药物灌胃8周。期间定期检测FBG、24 h尿微量蛋白(24 h U-mAlb)。给药8周后处死大鼠,检测Scr、BUN、Cystatin C水平,HE、PAS、Masson染色观察肾组织病理改变,免疫组织化学法检测巨噬细胞标志蛋白CD68、iNOS表达,Western blot法检测肾组织JNK/SAPK通路蛋白JNK、p-JNK和TNF-α、IL-1β、ICAM-1表达,ELISA法检测血清TNF-α、IL-1β、ICAM-1水平。结果与正常组比较,模型组大鼠FBG、24 h U-mAlb、BUN、Scr、Cystatin C水平均升高(P<0.01),肾组织出现病理损伤,肾组织和血清TNF-α、IL-1β、ICAM-1水平升高(P<0.01),肾组织JNK和p-JNK蛋白表达升高(P<0.01);与模型组比较,各给药组大鼠FBG、24 h U-mAlb、BUN、Scr、Cystatin C水平均降低(P<0.05,P<0.01),肾组织病理损伤减轻,肾组织和血清TNF-α、IL-1β、ICAM-1水平降低(P<0.01),肾组织JNK和p-JNK蛋白表达降低(P<0.01);金雀根组与黄芪组比较各指标均无明显变化(P>0.05);与金雀根组或黄芪组比较,金雀根加黄芪组各指标均有不同程度的改善(P<0.05,P<0.01)。结论金雀根、黄芪及其配伍可改善DKD大鼠肾功能,抑制M1型巨噬细胞,减少炎症因子分泌,减轻肾脏病理损伤,其机制可能与抑制JNK/SAPK信号通路激活有关,金雀根与黄芪配伍药效较好。

AIM To investigate the renoprotective effects and mechanism of Caragana sinica roots,Astragali Radix and their combination use on the rat model of diabetic kidney disease(DKD).METHODS Sixty SD rats were randomly divided into the normal group,the model group,the Empagliflozin group(10 mg/kg),the C.sinica roots group(3.1 g/kg),the Astragali Radix group(3.1 g/kg),and the C.sinica roots plus Astragali Radix group(6.2 g/kg).In contrast to the intact rats of the normal group,rats of the other groups underwent left nephrectomy and intraperitoneal injection of streptozotocin(STZ)followed by 8-week intragastric gavage of the corresponding agent,during which their levels of FBG and 24 h urinary microprotein(24 h U-mAlb)were detected regularly.The rats killed at the end of the trial had their levels of Scr,BUN and Cystatin C detected;their renal pathological changes observed by HE,PAS and Masson stainings;their expressions of macrophage marker proteins CD68 and iNOS detected by immunohistochemistry;their expressions of renal JNK/SAPK pathway proteins such as JNK,p-JNK,TNF-α,IL-1βand ICAM-1 detected by Western blot;and their serum levels of TNF-α,IL-1βand ICAM-1 detected by ELISA as well.RESULTS Compared with the normal group,the model group displayed increased levels of FBG,24 h U-mAlb,BUN,Scr and Cystatin C(P<0.01);more renal pathological damage,and increased levels of TNF-α,IL-1βand ICAM-1 in the renal tissue and serum(P<0.01);and increased renal protein expressions of JNK and p-JNK(P<0.01).Compared with the model group,all of the groups intervened with an agent shared decreased levels of FBG,24 h U-mAlb,BUN,Scr and Cystatin C(P<0.05,P<0.01);alleviated renal pathological damage,and decreased levels of TNF-α,IL-1βand ICAM-1 in renal tissue and serum(P<0.01).There existed no group difference between the Astragali Radix group and the C.sinica roots group in terms of all indices levels(P>0.05).The C.sinica roots plus Astragali Radix group demonstrated its superiority over either C.sinica roots group or Astragali Radix group in terms of all the indices levels(P<0.05,P<0.01).CONCLUSION C.sinica roots,Astragali Radix or their combination use can alleviate the renal pathological damage and improve the renal function of DKD rats through inhibiting the M1 macrophages,reducing the secretion of inflammatory factors,whose mechanism may lie in the inhibition of JNK/SAPK signal pathway activation.A better effect can be anticipated by the combination use of C.sinica roots and Astragali Radix.