title: Decoy receptor 3 protects non-obese diabetic mice from autoimmune diabetes by regulating dendritic cell maturation and function.
abstract: Decoy receptor 3 (DcR3), a member of the tumor necrosis factor receptor superfamily, regulates immune responses through competing with receptors of Fas ligand (FasL), LIGHT and TNF-like molecule 1A (TL1A). We have previously demonstrated that transgenic expression of DcR3 in a β cell-specific manner significantly protects non-obese diabetic (NOD) mice from autoimmune diabetes. In this study, we further investigated the systemic effect of DcR3 in regulating lymphocytes and dendritic cells in NOD mice. Our results demonstrated that both DcR3 plasmid and protein treatments significantly inhibited insulitis and diabetes. Lymphocytes from DcR3.Fc-treated mice revealed less proliferative potential and transferred ameliorated diabetes. By administration of DcR3.Fc in T1 and T2 double transgenic NOD mice expressing human Thy1 or murine Thy1.1 surface marker under IFN-γ or IL-4 promoter control respectively, we observed a remarkable reduction of Th1 and an increase of Th2 immune responses in vivo. Strikingly, in vitro polarization experiments exhibited that not only Th1 but also Th17 cell differentiation was significantly inhibited in splenocytes treated with DcR3.Fc protein. However, this phenomenon was only observed in splenocytes, not in purified CD4(+) T cells, suggesting that DcR3-mediated inhibition of Th1 and Th17 differentiation is not T cell-autonomous and maybe through other cell types such as dendritic cells. Finally, our results demonstrated that DcR3 directly modulates the differentiation and maturation of dendritic cells and subsequently regulates the differentiation and effector function of T cells.
authors.affiliation: Graduate Institute of Life Sciences, National Defense Medical Center, Neihu, Taipei, Taiwan.
authors.forename: Yen-Ling
authors.initials: YL
authors.lastname: Wang
authors.forename: Feng-Cheng
authors.initials: FC
authors.lastname: Chou
authors.forename: Hsiang-Hsuan
authors.initials: HH
authors.lastname: Sung
authors.forename: Pao-Luo
authors.initials: PL
authors.lastname: Fan
authors.forename: Chao-Wen
authors.initials: CW
authors.lastname: Hsueh
authors.forename: Wen-Chi
authors.initials: WC
authors.lastname: Lin
authors.forename: Shyi-Jou
authors.initials: SJ
authors.lastname: Chen
authors.forename: Wan-Wan
authors.initials: WW
authors.lastname: Lin
authors.forename: Huey-Kang
authors.initials: HK
authors.lastname: Sytwu
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D016764:Cell Polarity; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D005260:Female; D008297:Male; D051379:Mice; D016688:Mice, Inbred NOD; D053323:Receptors, Tumor Necrosis Factor, Member 6b / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology / Q000276:immunology
chemical_list: D053323:Receptors, Tumor Necrosis Factor, Member 6b