Co-stimulatory pathways controlling activation and peripheral tolerance of human CD4(+)CD28(-) cells

被引:86
作者
Park, W [1 ]
Weyand, CM [1 ]
Schmidt, D [1 ]
Goronzy, JJ [1 ]
机构
[1] MAYO CLIN & MAYO FDN,DIV RHEUMATOL,ROCHESTER,MN 55905
关键词
anergy; co-stimulation; rheumatoid arthritis; autoimmunity; oligoclonality;
D O I
10.1002/eji.1830270507
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Co-stimulation mediated by the CD28 molecule is considered critical in the activation of CD4(+) T cells. In patients with rheumatoid arthritis and infrequently in normal individuals, CD4(+) T cells lacking CD28 expression are expanded and contain clonogenic populations. To analyze whether these cells are independent of co-stimulatory requirements or whether they use co-stimulatory signals distinct from the CD28 pathway, we have compared CD4(+) CD28(+) and CD4(+) CD28(-) T cell clones isolated from rheumatoid arthritis patients. Accessory cells supported the induction of CD25 expression as well as of proliferative responses after anti-CD3 cross-linking and prevented the induction of anergy in CD4(+) CD28(-) T cell clones. In contrast to CD4(+)CD28(+) T cells, the presence of accessory cells did not enhance the secretion of interleukin (IL)-2, interferon-gamma, or IL-4. The co-stimulatory signals did not involve CD28/CTLA-4-CD80/CD86 receptor-ligand interactions. The proliferative response of CD4(+)CD28(-) T cells could not be blocked by anti-CD2, anti-CD18, and anti-CD58 antibodies, suggesting that these receptor-ligand interactions cannot provide CD28(-) independent co-stimulation. Our data suggest that CD4(+)CD28(-) T cells require costimulatory signals for optimal induction of cell growth and CD25 expression as well as for the prevention of anergy. The co-stimulatory receptor-ligand interaction is independent of the CD28 pathway and may be involved in the oligoclonal expansion of the CD4(+) CD28(-) T cell subset in rheumatoid arthritis.
引用
收藏
页码:1082 / 1090
页数:9
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