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. 1997 Feb;90(2):265–271. doi: 10.1046/j.1365-2567.1997.00162.x

Accumulation of CTLA-4 expressing T lymphocytes in the germinal centres of human lymphoid tissues.

J Castan 1, K Tenner-Racz 1, P Racz 1, B Fleischer 1, B M Bröker 1
PMCID: PMC1456743  PMID: 9135556

Abstract

CTLA-4, a coreceptor with sequence homology to CD28 is expressed on T cells after activation. Mice deficient for CTLA-4 die young from massive infiltration of many organs by activated T cells, which highlights the essential inhibitory role the coreceptor plays in the regulation of the immune response. To study the prevalence and distribution of CTLA-4 in situ immunohistological analyses were carried out on human tonsils and lymph nodes. Expression of CTLA-4 was restricted to alpha beta T cells, and CTLA-4+ B cells were not observed. In T-cell areas, 2-10% of T cells were positive for CTLA-4 with similar percentages in the CD4+ and CD8+ subpopulations. In the germinal centres (GC) the fraction of CTLA-4+ T cells was much higher (70-90%). This was due to frequent expression of CTLA-4 on the CD4+ helper subpopulation. GC CD8+ T cells were rare and mostly did not express the coreceptor. The CTLA-4+ T-cell fraction was also over-represented among intraepithelial tonsillar T cells. Cycling (Ki-67+) and apoptotic (TUNEL+) T cells were never positive for CTLA-4, while a subset of CD25+ cells did express the coreceptor. Since CTLA-4 is essential for the physiological limitation of the immune response, GC T cells, which are mostly CTLA-4 positive, might be important in this process.

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Selected References

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