A comparative assessment of the roles of CD8 and CD2 in the functions of activated murine CD8+ T lymphocytes.

ABSTRACT

Both CD8 and CD2 are T cell surface receptors involved in physical cell interaction and in transmembrane signalling. The present paper addresses their role in the induction of two different functions of the cloned murine cytotoxic T cell C196 target cell lysis and IFN-gamma production. These functions were induced in C196 either by stimulation with the specific stimulator/target cell P815 or, bypassing specific recognition, by the aCD3 hybridoma 145-2C11 or by solid phase aTCR antibodies. These responses were tested for their susceptibility to inhibition/enhancement by a panel of aCD8 and aCD2 mAb. In addition, CD8 deficient and CD8/CD2 double-deficient variants of C196 were transfected with the CD8 and CD2 genes and the resulting cell lines were analysed for their functional capacities. The following results were obtained (i) CD8 is primarily important in the specific recognition process of activated CTL; (ii) transmembrane signalling of activated CTL through the TCR does not require CD8, nor is it sensitive to modification through CD8; (iii) CTL can nevertheless be directly activated through CD8; however, this is restricted to induction of cytotoxicity but does not result in IFN-gamma production; (iv) CD2 does not seem to be important in any of these responses.