The Journal of Immunology, Vol 158, Issue 2 637-642, Copyright © 1997 by American Association of Immunologists

ARTICLES

The role of B7-1 and LFA-3 in costimulation of CD8+ T cells

E Parra, AG Wingren, G Hedlund, T Kalland and M Dohlsten
The Wallenberg Laboratory, Department of Cell and Molecular Biology, University of Lund, Sweden.

This study compares the ability of LFA-3 (CD58) and B7-1 (CD80) ligands to provide costimulatory signals for superantigen (SAg)-stimulated CD8+ and CD4+ T cells. We show that B7-1 and LFA-3 costimulation activate CD8+ T cells to proliferation, cytokine production (IL-2, TNF, and IFN- gamma), and cytotoxicity. A long-lasting proliferative response was observed after combined DR/B7-1/LFA-3 costimulation. Detailed analysis of SEA-activated CD8+ T cells revealed that maximal production of IFN- gamma was seen in LFA-3-costimulated cells, while production of IL-2 was mainly induced after B7-1 costimulation. A fivefold increase in the IFN-gamma production was observed when activated CD8+ T cells were costimulated with Chinese hamster ovary (CHO)-DR/LFA-3 cells compared with the secretion induced by CHO-DR/B7-1. In contrast, SEA-treated CD4+ T cells costimulated with B7-1 or LFA-3 gave rise to a similar production of IFN-gamma, suggesting a preferential function for the CD2/LFA-3 pathway in the regulation of IFN-gamma in CD8+ T cells. Moreover, the generation of CTL was supported similarly by B7-1 and LFA- 3 costimulation, but not by CHO-DR cells. We conclude that ligation of the CD28 and CD2 receptors mediate distinct effect on CD8+ and CD4+ T cell effector functions.

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