摘要
目的鉴定结核杆菌抗原Ag85A的HLA-A*0201限制性CTL优势表位。方法采用数据库SYFPEITHI初步预测结核抗原Ag85A的HLA-A*0201限制性CTL表位;经流式细胞术分析抗原肽与HLA-A*0201的亲和力;经时间荧光分辨法检测患者外周血单个核细胞(PBMCs)对抗原肽的增殖反应;最后通过细胞毒实验逐步鉴定Ag85A的HLA-A*0201限制性CTL预测的表位。结果实验证明,预测的位于Ag85A氨基酸序列(242-250aa)的肽表位与HLA-A*0201具有较高的亲和力。结论筛选出的KLIANNTRV(242-250aa)是结核杆菌抗原Ag85A的HLA-A*0201限制性CTL优势表位。
Objective To identify HLA-A * 0201 restricted CD8^+ CTL epitopes in Mycobacterium tuberculosis antigen Ag85A. Methods Firstly,database SYFPEITHI was applied to predict HLA-A * 0201 restricted CD8^+CTL epitopes in Mycobacterium tuberculosis antigen Ag85A. Secondly,affinity and stability of the predicted peptides with T2 ceil were assayed by FACS. Thirdly,cells proliferation and cytotoxicity induced by peptides were investigated by DELFIA cell proliferation assay and DELFIA EUTDA cytotoxicity test respectively. Results Peptide 3 (242-250aa)had high affinity with HLA-A * 0201 molecules,stimulated PBMCs from PPD+ healthy donors to proliferate and induce antigen specific CTLs. Only pep3 can give a postitive proliferation response and specific cytotoxicity. Conclusion Pep 3 (KLIANNTRV 242- 250aa) is HLA-A * 0201 restricted CDS+CTL epitope of Mtb antigen Ag85A,which could be the candidate for TB peptidebased vaccine.
出处
《现代检验医学杂志》
CAS
2007年第5期1-3,共3页
Journal of Modern Laboratory Medicine
基金
国家自然科学基金(30471616)
上海市重大科技攻关基金(04DZ19116)
上海市重点科研支撑条件项目(051409012)
上海市青年科技启明星计划(QMX01423)
上海市重点基础研究项目(05JC14052)资助
关键词
结核杆菌
AG85A
CTL表位
预测
鉴定
Mycobacterium tuberculosis
antigen Ag85A
cytotoxic T lymphocyte
epitope
prediction
identification
作者简介
陈燕(1977-),女,技师,主要从事临床免疫学检验工作;
娄加陶(1972-),男,博士,主治医师,主要从事临床免疫学研究
通讯作者及指导教师:仲人前(1962-),男,教授,主要从事临床免疫学研究,rqzhong@hotmail.com。
通讯作者及指导教师:邓安梅(1970-),副教授,主要从事临床免疫学研究,amdeng70@yahoo.com;