期刊
FASEB JOURNAL
卷 14, 期 13, 页码 2065-2074出版社
FEDERATION AMER SOC EXP BIOL
DOI: 10.1096/fj.99-0508com
关键词
inflammatory mediators; cytokines; T lymphocytes; inflammation
资金
- NIAMS NIH HHS [1R43AR46167-01] Funding Source: Medline
- NIGMS NIH HHS [R29GM54773, 1R43GM59560-01] Funding Source: Medline
Interleukin 12 (IL-12) is a crucial cytokine in the regulation of T helper 1 vs. T helper 2 immune responses. In the present study, we investigated the effect of the endogenous purine nucleoside adenosine on the production of IL-12, In mouse macrophages, adenosine suppressed 12,12 production. Although the order of potency of adenosine receptor agonists suggested the involvement of A(2a) receptors, data obtained with A(2a) receptor-deficient mice showed that the adenosine suppression of IL-12 and even TNF-alpha production is only partly mediated by A(2a) receptor ligation. Studies with adenosine receptor antagonists or the adenosine uptake blocker dipyridamole showed that adenosine released endogenously also decreases IL-12. Although adenosine increases IL-10 production, the inhibition of IL-12 production is independent of the increased IL-10. The mechanism of action of adenosine was not associated with alterations of the activation of the p38 and p42/p44 mitogen-activated protein kinases or the phosphorylation of the c-Jun terminal kinase. Adenosine failed to affect steady-state levels of either IL-12 p35 or p40 mRNA, but augmented IL-10 mRNA levels. In summary, adenosine inhibits IL-12 production via various adenosine receptors. These results support the notion that adenosine-based therapies might be useful in certain autoimmune and/or inflammatory diseases.
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