The Journal of Immunology, Vol 146, Issue 8 2488-2494, Copyright © 1991 by American Association of Immunologists

ARTICLES

Regulation of expression of CD27, a T cell-specific member of a novel family of membrane receptors

R de Jong, WA Loenen, M Brouwer, L van Emmerik, EF de Vries, J Borst and RA van Lier
Central Laboratory of the Netherlands Red Cross Blood Transfusion Service, Amsterdam.

CD27 belongs to a newly defined family of transmembrane R, including the nerve growth factor R, two distinct TNF R and CD40. The function of CD27 is unknown, but on the basis of structural and functional properties, we postulate that it plays a role in the events subsequent to T cell activation, possibly as a cytokine R. We have analyzed the mechanisms underlying the regulation of CD27 protein expression. Membrane expression of CD27 strongly increases after T cell activation via the TCR/CD3 complex or the CD2 molecule. In contrast, direct stimulation of protein kinase C by phorbol esters markedly down- regulates CD27 surface expression. This down-regulation most likely does not result from CD27 phosphorylation, because both anti-CD3 mAb and PMA induce hyperphosphorylation of CD27 on serine residues. Rather, membrane expression seems to be regulated primarily at the RNA level. Stimulation of T cells with anti-CD3 mAb strongly increases steady state CD27 mRNA levels, whereas PMA treatment greatly reduces these transcript levels. Dissection of the TCR/CD3-induced signaling pathways showed that cytoplasmic cAMP as well as Ca2+ concentrations contribute to the increase of CD27 expression. These data indicate that upon Ag- specific T cell stimulation, membrane expression of CD27 is regulated at the RNA level through the joint action of distinct TCR/CD3- associated signaling pathways.

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