CTLA-4 expressed by human dendritic cells modulates thei cytokine secretion and induction of T cell proliferation
| Autor: | S. Laurent, P. Carrega, D. Saverino, P. Piccioli, M. Camoriamo, A. Morabito, B. Dozin, V. Fontana, R. Simone, L. Mortara, M.C. Mingari, G. Ferlazzo, M.P. Pistillo |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Journal of Biological Research, Vol 84, Iss 1 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1826-8838 2284-0230 |
| DOI: | 10.4081/jbr.2011.4651 |
| Popis: | CTLA-4 is the major nefative regulator of T cell response. We have analyzed the expression of CTLA-4 in human monocytes and monocyte-derived DCs and the effects of its engagement on cytokine production and T cell stimulatory activity by mature DCs (mDCs). We found the CTLA-4 was highly expressed on freshly isolated monocytes, then down-modulated on the immature DCs (iDCs) and upregulated on mDCs. Treatment of mDCS with an agonistic anti-CTLA-4 m Ab enhanced secretion of IL-10 but reduced secretion of IL-8 and IL-12, as well as autologous CD4* T-cell proliferation in response to simulation with PPD recall antigenloaded-DCs. Neutralization of IL-10 with an anti-IL-10 antibody partially restored the ability of anti-CTLA-4-treated mDCs to stimulate T cell proliferation in response to PPD. Our data provide the first evidence that CTLA-4 receptor is expressed by human mDCs and exerts immune modulatory effects in these cells. |
| Databáze: | Directory of Open Access Journals |
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