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. 1988 Sep;85(17):6503–6507. doi: 10.1073/pnas.85.17.6503

Influence of activating stimulus on functional phenotype: interleukin 2 mRNA accumulation differentially induced by ionophore and receptor ligands in subsets of murine T cells.

K L McGuire 1, J A Yang 1, E V Rothenberg 1
PMCID: PMC282001  PMID: 3137569

Abstract

We have investigated the linkage between CD4/CD8 phenotype and programming for specific responses in primary T-cell populations. In situ hybridization has been used to determine the frequency of cells competent to express the interleukin 2 (IL-2) gene after short-term stimulation with various polyclonal activators. The effects of the T-cell receptor ligands Con A and anti-CD3 monoclonal antibody were compared with those of a calcium ionophore that bypasses membrane receptors altogether. Induction with a calcium ionophore and phorbol ester revealed that potential IL-2 producers not only constitute greater than 85% of the cells with a CD4+ "helper/inducer" phenotype but also constitute over half of the cells with a CD8+ "killer/suppressor" phenotype. There is no defect in the ability of these CD8+ cells to accumulate IL-2 transcripts under these conditions. By contrast, in response to phorbol ester and either Con A or anti-CD3, the CD8+ cells show an abortive IL-2 production response with rapid disappearance of IL-2 mRNA. This results in substantially lower yields of IL-2 per cell than is made by CD4+ cells in response to the same stimuli. The extent to which these populations appear to have diverged in function thus depends on the stimulus used to trigger the response. The results suggest that differences in signal transduction or posttranscriptional regulatory mechanisms, rather than effector gene inducibility per se, may initially underlie the commitment of CD4+ and CD8+ cells to distinct functional roles.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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