Regulation of expression of CD27, a T cell-specific member of a novel family of membrane receptors
| Autor: | R, de Jong, W A, Loenen, M, Brouwer, L, van Emmerik, E F, de Vries, J, Borst, R A, van Lier |
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| Rok vydání: | 1991 |
| Předmět: |
Antigens
Differentiation T-Lymphocyte Dose-Response Relationship Drug T-Lymphocytes Colforsin Antibodies Monoclonal Down-Regulation Fluorescent Antibody Technique Blotting Northern Lymphocyte Activation Precipitin Tests Second Messenger Systems Tumor Necrosis Factor Receptor Superfamily Member 7 Bucladesine Gene Expression Regulation Cyclic AMP Humans RNA Calcium Electrophoresis Polyacrylamide Gel Phosphorylation Phytohemagglutinins Cell Division Protein Kinase C |
| Zdroj: | Journal of immunology (Baltimore, Md. : 1950). 146(8) |
| ISSN: | 0022-1767 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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