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The Journal of Immunology, Vol 155, Issue 3 1032-1036, Copyright © 1995 by American Association of Immunologists


CUTTING EDGE

Antigen-dependent clonal expansion of a trace population of antigen- specific CD4+ T cells in vivo is dependent on CD28 costimulation and inhibited by CTLA-4

ER Kearney, TL Walunas, RW Karr, PA Morton, DY Loh, JA Bluestone and MK Jenkins
Department of Microbiology, University of Minnesota Medical School, Minneapolis 55455, USA.

The importance of CD28 costimulation to a primary T cell response in vivo was assessed in an adoptive transfer system where a small population of peptide-specific CD4+ TCR transgenic T cells can be physically tracked. Ag-dependent clonal expansion of the transgenic T cells in draining lymph nodes was blocked by cyclosporin A and required a CD28 signal that was completely inhibited by CTLA-4-Ig or a combination of anti-B7-1 and anti-B7-2 mAbs, but not by either Ab alone. In vivo treatment with the combination of anti-B7-1 and anti-B7- 2 mAbs also blocked conversion of the Ag-specific T cells to the activated phenotype. In contrast, anti-CTLA-4 Fab greatly enhanced the in vivo clonal expansion of the Ag-specific T cells. These results suggest that Ag-driven proliferation and phenotype conversion of naive CD4+ T cells is dependent on CD28-derived signals and is inhibited by CTLA-4.


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