B7-H4在实验性自身免疫性心肌炎小鼠中的表达

Expression of B7-H4 in experimental autoimmune myocarditis

目的:研究新型共刺激分子B7-H4在实验性自身免疫性心肌炎小鼠发病中表达情况。方法:将BALB/c小鼠随机分为对照组与实验组。给实验组小鼠注射猪心肌肌凝蛋白建立实验性自身免疫性心肌炎模型,对照组给予同体积不含肌凝蛋白的完全弗氏佐剂及生理盐水。在实验的第14、21、30、45天分批处死小鼠,提取组织进行淋巴细胞增殖实验、苏木素-伊红(HE)染色、免疫组织化学染色及实时荧光定量PCR(real-time PCR)。结果:心肌炎症改变在第21、30天时最严重,之后逐渐降低;淋巴细胞增殖实验与real-time PCR的结果与心肌炎症情况类似,在实验期间随炎症情况变化,较正常均增高(P<0.05);免疫组化结果显示B7-H4蛋白在心肌炎的心肌血管内皮恒定表达。结论:新型共刺激分子B7-H4参与心肌炎病程,可能为心肌炎的发病机制提供新的研究思路。

Objective：To observe the expression of B7-H4 in experimental autoimmune myocarditis （EAM）.Methods：BALB/c mice were randomly divided into 2 groups：the control group and the experimental group.The mice of experimental group were injected with myosin to establish EAM models , while the mice of control group were injected with complete Freund ＇s adjuvant and normal saline.All the mice were killed separately at the 14th,21st,30th and 45th day for lymphocyte proliferation assay ,hematoxylin-eosin staining,immunohistochemical staining and real-time PCR.Results：The inflammation infiltration of heart was most serious at the 14th and 21st day,then it was gradually relieved with time;the results of lymphocyte proliferation assay and real-time PCR were similar to that of the inflammation infiltration of heart ,which were in high level at the 14th and 21st day,and they were both higher than that of the control group （ P〈0.05 ）;B7-H4 protein were only detected in the experimental group ,and it was constantly expressed during the whole experiment on the endothelium of heart with myocarditis.Conclusion：B7-H4 participates in the progress of EAM ,and it may be a new way of studying the mechanism of myocarditis.