トキタ　ダイスケ   Tokita Daisuke   時田　大輔    所属   医学部 医学科（東京女子医科大学病院）    職種   非常勤講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Allostimulatory activity of bone marrow-derived plasmacytoid dendritic cells is independent of indoleamine dioxygenase but regulated by inducible costimulator ligand expression.
掲載誌名	正式名：Human immunology 略　 称：Hum Immunol ISSNコード：18791166/01988859
掲載区分	国外
巻・号・頁	70(5),pp.313-20
著者・共著者	Colvin Bridget L, Sumpter Tina L, Tokita Daisuke, Salati Jennifer, Mellor Andrew L, Thomson Angus W
発行年月	2009/05
概要	We investigated the role of two key immunoregulatory molecules, indoleamine dioxygenase (IDO) and inducible costimulator ligand (ICOSL), in determining the function of bone marrow (BM)-derived plasmacytoid (p)DC, which offer the potential for therapy of allograft rejection. pDC generated from BM of wild-type (WT) or IDO knockout (KO) C57BL/6 mice were used to stimulate T-cell proliferation and interferon-gamma (IFN-gamma) production in response to alloantigen (alloAg) via the direct or indirect pathways. In some experiments, pDC were first activated by exposure to CpG +/- CTLA4Ig for IDO induction via B7 ligation. Although IDO KO pDC induced enhanced T-cell responses compared with WT pDC, the use of the IDO inhibitor 1-methyltryptophan (1-MT) demonstrated that the inferior stimulatory capacity of WT pDC was not caused by the production of functional IDO, even under IDO-inducing conditions. The DNAX-activating protein of 12 kDa (DAP12), which inhibits functional IDO expression, was expressed in BM-pDC. DAP12 silencing increased the T-cell stimulatory capacity of WT pDC, but only in the presence of 1-MT. Compared with WT pDC, activated IDO KO DC expressed much lower levels of ICOSL. Moreover, when ICOSL was blocked on WT pDC, T-cell proliferation resembled that induced by IDO KO pDC, and interleukin (IL)-10 secretion in MLR was markedly decreased. These findings implicate ICOSL-induced IL-10, but not IDO in the regulation of BM-derived pDC function.
DOI	10.1016/j.humimm.2009.01.021
PMID	19208362