Extracellular ATP induces a distorted maturation of dendritic cells and inhibits their capacity to initiate Th1 responses

被引:179
作者
la Sala, A
Ferrari, D
Corinti, S
Cavani, A
Di Virgilio, F
Girolomoni, G
机构
[1] Ist Ric & Cura Carattere Sci, Immunol Lab, Ist Dermopat Immacolata, I-00167 Rome, Italy
[2] Univ Ferrara, Dept Expt & Diagnost Med, Sect Gen Pathol, I-44100 Ferrara, Italy
关键词
D O I
10.4049/jimmunol.166.3.1611
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Dendritic cells (DCs) express functional purinergic receptors, but the effects of purine nucleotides on DC functions have been marginally investigated. In this study, we report on the ability of micromolar concentrations of ATP to affect the maturation and Ag-presenting function of monocyte-derived DCs in vitro. Chronic stimulation (24 h) of DCs with low, noncytotoxic ATP doses increased membrane expression of CD54, CD80, CD86, and CD83, slightly reduced the endocytic activity of DCs, and augmented their capacity to promote proliferation of allogeneic naive T lymphocytes. Moreover, ATP enhanced LPS- and soluble CD40 ligand-induced CD54, CD86, and CD83 expression. On the other hand, ATP markedly and dose-dependently inhibited LPS- and soluble CD40 ligand-dependent production of IL-1 alpha, IL-1 beta, TNF-alpha, IL-6, and IL-12, whereas IL-1 receptor antagonist and IL-10 production was not affected. As a result, T cell lines generated from allogeneic naive CD45RA(+) T cells primed with DCs matured in the presence of ATP produced lower amounts of IFN-gamma and higher levels of IL-4, IL-5, and IL-10 compared with T cell lines obtained with LPS-stimulated DCs, ATP inhibition of TNF-alpha and IL-12 production by mature DCs was not mediated by PGs or elevation of intracellular cAMP and did not require ATP degradation. The inability of UTP and the similar potency of ADP to reproduce ATP effects indicated that ATP could function through the P2X receptor family. These results suggest that extracellular ATP may serve as an important regulatory signal to dampen IL-12 production by DCs and thus prevent exaggerated and harmful immune responses.
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页码:1611 / 1617
页数:7
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