线性多肽α3127-148诱导抗肾小球基底膜肾炎大鼠模型的建立  

Establishment of a rat model of anti-glomerular basement membrane glomerulonephritis induced by linear polypeptide α3127-148

作　　者：石美涵 周诚 杨蕴钊 白雪源 Shi Meihan;Zhou Cheng;Yang Yunzhao;Bai Xueyuan(Nankai University School of Medicine,Tianjin 300191;Department of Nephrology,First Medical Center of Chinese PLA General Hospital,Chinese PLA Institute of Nephrology,State Key Laboratory of Kidney Diseases,National Clinical Research Center for Kidney Diseases,Beijing Key Laboratory of Kidney Diseases,Beijing 100853,China)

机构地区：[1]南开大学医学院,天津300191 [2]解放军总医院第一医学中心肾脏病医学部、解放军肾脏病研究所、肾脏疾病国家重点实验室、国家慢性肾病临床医学研究中心、肾脏疾病研究北京市重点实验室,北京100853

出　　处：《中华肾病研究电子杂志》2022年第1期1-6,共6页Chinese Journal of Kidney Disease Investigation（Electronic Edition）

基　　金：国家重点研发计划项目(2020YFA0113004);国家自然科学基金重点项目(81830060)

摘　　要：目的以人Ⅳ型胶原α3链非胶原区结构域1[α3(Ⅳ)NC1]上的线性多肽α3127-148作为抗原,建立抗肾小球基底膜(GBM)肾炎大鼠模型。方法7~8周龄雌性WKY大鼠30只,体重100~150 g,随机分为3组(10只/组):对照组、低剂量多肽免疫组(低剂量组)、高剂量多肽免疫组(高剂量组)。多肽α3127-148一次性注射于大鼠后足垫来进行建模,低剂量组注射200μg/kg、高剂量组注射300μg/kg、对照组仅注射等体积溶剂。每周定时收集24 h尿测尿蛋白浓度。所有动物在第6周末处死,检测血清肌酐和尿素氮。大鼠肾组织切片进行PAS染色、Masson染色及免疫荧光染色。结果与对照组相比,高剂量组24 h尿蛋白浓度自第3周末开始明显升高(P<0.05),第6周末血清尿素氮和肌酐水平均明显升高(P<0.05),PAS染色可见肾小球硬化、弥漫性新月体形成,荧光染色可见IgG在GBM呈明显线性沉积。与对照组比较,低剂量组第6周末24 h尿蛋白浓度明显升高(P<0.05),PAS染色亦见肾小球有明显损伤,但较高剂量组轻。结论本研究采用线性多肽α3127-148免疫WKY大鼠,成功地建立了抗GBM肾炎模型,该方法简单、效率高。Objective To establish a rat model of anti-glomerular basement membrane(GBM)glomerulonephritis induced by the linear polypeptideα3127-148 on the non-collagen domain 1 of theα3 chain of human type IV collagen[α3(IV)NC1]as the antigen.Methods Thirty female WKY rats aged 7-8 weeks,weighing 100-150 g,were randomly divided into 3 groups:the control group,the low-dose polypeptide immunization group(low-dose group),and the high-dose polypeptide immunization group(high-dose group)with 10 rats each.The polypeptideα3127-148 in the solvent was injected into the hind foot pad of rats only once for modeling.The low-dose group was injected with the polypeptideα3127-148 of 200μg/kg,the high-dose group with 300μg/kg,and the control group was injected with the solvent of the equal volume.After immunization,the 24-hour urine was collected regularly each week to measure the urine protein concentration.All the rats were sacrificed at the end of the 6 th week,and serum creatinine and blood urea nitrogen were measured.Rat kidney tissue sections were subjected to PAS staining,Masson staining,and immunofluorescence staining.Results Compared with the control group,the high-dose group showed significantly higher level of the 24-hour urine protein from the end of the 3 rd week(P<0.05),and significantly higher level of the serum urea nitrogen and creatinine at the end of the 6 th week(P<0.05),together with glomerular sclerosis and diffuse crescent formation in PAS staining,as well as GBM linear deposit of IgG in fluorescent staining.Compared with the control group at the end of the 6 th week,the low-dose group displayed higher level of 24-hour urine protein(P<0.05)and obvious damage to the glomeruli in PAS staining,but the latter was milder than that in the high-dose group.Conclusion In this study,a linear polypeptideα3127-148 was used to immunize WKY rats and an anti-GBM nephritis model was successfully established,the method of which was simple and efficient.

关 键 词：抗肾小球基底膜肾炎 新月体 线性多肽α3127-148 

分 类 号：R692.3[医药卫生—泌尿科学] R-332[医药卫生—外科学]