Cytotoxic T lymphocyte-associated antigen-4 inhibits integrin-mediated stimulation |
| |
Authors: | Gatta Lucia Calviello Gabriella Di Nicuolo Fiorella Pace Luigia Ubaldi Vanessa Doria Gino Pioli Claudio |
| |
Institution: | Section of Toxicology and Biomedicine, ENEA C. R. Casaccia, Via Anguillarse 301, 00060 Rome, Italy. |
| |
Abstract: | The negative role exerted by cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) in the regulation of T-cell activity, as induced by T-cell receptor (TCR)/CD3 and CD28 costimulation, has been widely described. In the present work we investigated the role of CTLA-4 in the control of cell activation, as induced by costimulation of the adhesion molecule lymphocyte function-associated antigen-1 (LFA-1) in murine CD4+ T cells. Results show that CTLA-4 engagement inhibits interleukin-2 (IL-2) production, not only when induced by CD3/CD28 costimulation, but also when CD4+ T cells are costimulated by anti-CD3 and anti-LFA-1 monoclonal antibodies (mAbs). LFA-1 has been described to induce Ca2+ mobilization also in the absence of TCR engagement. Moreover, we found that CTLA-4 engagement negatively affects Ca2+ mobilization and NF-AT activation, as induced by LFA-1 engagement alone. PLCgamma1 phosphorylation was also dampened within minutes after CTLA-4 engagement. Altogether these data indicate that through the control of signals induced by different receptors, CTLA-4 could be a global attenuator of T-cell activation. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|