[关键词]
[摘要]
目的 基于调控 VEGF-C/VEGFR3 通路抑制淋巴管新生探讨补阳还五汤合参芪地黄汤化裁对糖尿病肾 病 (DKD) 小鼠的保护作用及机制。方法 将 24 只雄性 db/db 小鼠随机分为模型组、中药组 (补阳还五汤合参芪 地黄汤化裁,生药量 24.44 g·kg-1 ) 和西药组 (厄贝沙坦,13.5 mg·kg-1 ) ,每组 8 只,另外取 8 只 db/m 小鼠作为 对照组。灌胃给药,每日 1 次,连续 12 周。检测小鼠血糖 (FBG) 、总胆固醇 (TC) 、甘油三脂 (TG) 、尿白蛋白/ 肌酐比值 (ACR) 及肾脏指数;采用 HE、Masson 染色法观察肾脏组织病理变化;免疫组化法检测肾脏组织纤连 蛋白 (FN) 、Ⅰ型胶原蛋白 (ColⅠ) 、波形蛋白 (Vimentin) 、α 平滑肌肌动蛋白 (α-SMA) 、转化生长因子 β1 (TGF-β1) 、血管内皮生长因子受体 3 (VEGFR3) 、血管内皮生长因子 C (VEGF-C) 、淋巴管内皮透明质酸受体 1 (LYVE-1) 、平足蛋白 (PDPN) 、肿瘤坏死因子 α (TNF-α) 和白细胞介素 1β (IL-1β) 的表达;Western Blot 法检 测肾脏组织 ColⅠ、Vimentin、α-SMA、TGF-β1、VEGFR3、VEGF-C、LYVE-1、TNF-α、IL-1β 蛋白表达; Real-time PCR 法检测肾脏组织 FN、ColⅠ、TGF-β1、VEGF-C、VEGFR3、TNF-α、IL-1β mRNA 表达。 结果 与对照组比较,模型组小鼠的血清 FBG、TG、TC、ACR 水平及肾脏指数均明显升高 (P<0.05) ;肾小 球肥大,系膜外基质增加,基底膜增厚,囊腔变窄,肾小管上皮细胞变性、坏死,间质有大量炎性细胞浸润, 肾小管萎缩,纤维化水平明显升高 (P<0.05);肾间质中 FN、ColⅠ、Vimentin、α -SMA、TGF- β1、 VEGFR3、LYVE-1、TNF-α、IL-1β 蛋白表达,胞质中 VEGF-C 蛋白表达及肾小管毛细血管周围 VEGFR3、 PDPN 蛋白表达均明显上调 (P<0.05) ;肾脏组织中 ColⅠ、Vimentin、α-SMA、TGF-β1、VEGFR3、VEGF-C、 LYVE-1、TNF-α、IL-1β 蛋白表达均明显上调(P<0.05);肾脏组织中 FN、ColⅠ、TGF-β1、VEGF-C、 VEGFR3、TNF-α、IL-1β mRNA 表达水平均明显升高 (P<0.05) 。与模型组比较,中药组小鼠的血清 TG、TC、ACR 水平均明显降低 (P<0.05) ;肾脏组织损伤有不同程度好转,炎性细胞浸润有一定程度减轻,纤维化水平 明显降低 (P<0.05) ;肾间质中 FN、ColⅠ、Vimentin、α-SMA、TGF-β1、VEGFR3、LYVE-1、TNF-α、IL-1β 蛋白表达,胞质中 VEGF-C 蛋白表达及肾小管毛细血管周围 VEGFR3、PDPN 蛋白表达均明显下调 (P<0.05) ; 肾脏组织中 ColⅠ、Vimentin、α-SMA、TGF-β1、VEGFR3、VEGF-C、LYVE-1、TNF-α、IL-1β蛋白表达均明 显下调 (P<0.05) ;肾脏组织中 FN、ColⅠ、TGF-β1、VEGF-C、VEGFR3、TNF-α、IL-1β mRNA 表达水平均明 显降低 (P<0.05) 。结论 补阳还五汤合参芪地黄汤化裁可降低 DKD 小鼠肾脏组织炎症及纤维化水平,其机制 可能与调控 VEGF-C/VEGFR3 通路抑制淋巴管新生有关。
[Key word]
[Abstract]
University of Chinese Medicine,Shijiazhuang 050091 Hebei,China) Abstract:Objective To explore the protective effect and mechanism of modified Buyang Huanwu Decoction and Shenqi Dihuang Decoction on diabetic kidney disease (DKD) mice based on the regulation of VEGF-C/VEGFR3 pathway inhibiting lymphangiogenesis. Methods Twenty-four male db/db mice were randomly divided into model group,Chinese medicine group (modified Buyang Huanwu Decoction combined with Shenqi Dihuang Decoction, crude drug 24.44 g·kg-1 ) and western medicine group(Irbesartan,13.5 mg·kg-1 ),with eight mice in each group. Eight db/m mice were selected as control group. Intragastric administration was given once a day for 12 consecutive weeks. Fasting blood glucose (FBG),total cholesterol (TC),triglyceride (TG),urinary albumin/creatinine ratio (ACR) and kidney index were measured. The pathological changes of renal tissue were observed by HE and Masson staining. The expressions of fibronectin (FN),type I collagen (Col I),Vimentin,α -smooth muscle actin (α -SMA),transforming growth factor-β1(TGF-β1),vascular endothelial growth factor receptor 3(VEGFR3), vascular endothelial growth factor-C (VEGF-C),lymphatic endothelial hyaluronic acid receptor 1 (LYVE-1), podoplanin (PDPN),tumor necrosis factor- α (TNF- α) and interleukin-1β (IL-1β) in renal tissue were detected by immunohistochemistry. The protein expressions of Col I,Vimentin,α -SMA,TGF- β1,VEGFR3, VEGF-C,LYVE-1,TNF-α and IL-1β in renal tissue were detected by Western Blot. The mRNA expressions of FN,Col I,TGF-β1,VEGF-C,VEGFR3,TNF-α and IL-1β in renal tissue were detected by Real-time PCR. Results Compared with the control group,the levels of serum FBG,TG,TC,ACR and kidney index in the model group were significantly increased (P<0.05). Glomerular hypertrophy, mesangial matrix increased, basement membrane thickening,cystic cavity narrowing,renal tubular epithelial cell degeneration and necrosis,interstitial infiltration of a large number of inflammatory cells,renal tubular atrophy;the level of renal fibrosis was significantly increased(P<0.05). The protein expressions of FN,Col I,Vimentin,α-SMA,TGF-β1,VEGFR3,LYVE-1, TNF- α, IL-1β in renal interstitium, the expression of VEGF-C protein in cytoplasm and the expression of VEGFR3 and PDPN protein around renal tubular capillaries were significantly up-regulated(P<0.05). The protein expressions of Col I,Vimentin,α-SMA,TGF-β1,VEGFR3,VEGF-C,LYVE-1,TNF-α and IL-1β in renal tissue were significantly up-regulated(P<0.05). The mRNA expression levels of FN,Col I,TGF-β1,VEGF-C, VEGFR3,TNF- α and IL-1β in renal tissue were significantly increased (P<0.05). Compared with the model group,the levels of serum TG,TC and ACR in the Chinese medicine group were significantly decreased (P< 0.05). Renal tissue injury was improved to varying degrees,renal inflammatory cell infiltration was reduced to a certain extent,and renal tissue fibrosis was significantly reduced (P<0.05). The protein expressions of FN,Col I, Vimentin, α -SMA, TGF- β1, VEGFR3, LYVE-1, TNF- α, IL-1β in renal interstitium, the protein expression of VEGF-C in cytoplasm and the protein expressions of VEGFR3 and PDPN around renal tubular capillaries were significantly down-regulated (P<0.05). The protein expressions of Col I,Vimentin,α -SMA, TGF-β1,VEGFR3,VEGF-C,LYVE-1,TNF- α and IL-1β in renal tissue were significantly down-regulated (P<0.05). The mRNA expression levels of FN,Col I,TGF-β1,VEGF-C,VEGFR3,TNF-α and IL-1β in renal tissue were significantly decreased (P<0.05). Conclusion Modified Buyang Huanwu Decoction combined with Shenqi Dihuang Decoction can reduce the level of inflammation and fibrosis in renal tissue of DKD mice,and its mechanism may be related to the regulation of VEGF-C/VEGFR3 pathway to inhibit lymphangiogenesis.
[中图分类号]
R285.5
[基金项目]
河北省自然科学基金项目 (H2022423342);河北省教育厅重点项目 (ZD2021081);河北省重点研发计划中医药创新专项 (22377715OD)