Nitric oxide inhibits IFN-α production of human plasmacytoid dendritic cells partly via a guanosine 3′,5′-cyclic monophosphate-dependent pathway

Rimpei Morita, Takashi Uchiyama, Toshiyuki Hori

研究成果: Article

28 引用 (Scopus)

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NO, a free radical gas, is known to be critically involved not only in vascular relaxation but also in host defense. Besides direct bactericidal effects, NO has been shown to inhibit Th1 responses and modulate immune responses in vivo, although the precise mechanism is unclear. In this study, we examined the effect of NO on human plasmacytoid dendritic cells (pDCs) to explore the possibility that NO might affect innate as well as adaptive immunity through pDCs. We found that NO suppressed IFN-α production of pDCs partly via a cGMP-dependent mechanism, which was accompanied by down-regulation of IFN regulatory factor 7 expression. Furthermore, treatment of pDCs with NO decreased production of IL-6 and TNF-α and up-regulated OX40 ligand expression. In accordance with these changes, pDCs treated with NO plus CpG-oligodeoxynucleotide AAC-30 promoted differentiation of naive CD4 + T cells into a Th2 phenotype. Moreover, pDCs did not express inducible NO synthase even after treatment with AAC-30, LPS, and several cytokines. These results suggest that exogenous NO and its second messenger, cGMP, alter innate as well as adaptive immune response through modulating the functions of pDCs and may be involved in the pathogenesis of certain Th2-dominant allergic diseases.

元の言語English
ページ(範囲)806-812
ページ数7
ジャーナルJournal of Immunology
175
発行部数2
DOI
出版物ステータスPublished - 2005 7 15

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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