title: CTLA4-Ig modifies dendritic cells from mice with collagen-induced arthritis to increase the CD4+CD25+Foxp3+ regulatory T cell population.
abstract: Cytotoxic T lymphocyte antigen-4 (CTLA4) and IgG fusion protein, CTLA4-Ig, is a therapeutic agent used for rheumatoid arthritis. It binds B7 molecules on dendritic cells (DCs) and thereby blocks B7/CD28 costimulatory interaction and inhibits effective T cell proliferation. However, the effect of CTLA4-Ig on the regulatory T cell (Treg) is still not known. In this study, we investigated the influence of CTLA4-Ig on the CD4+CD25+Foxp3+ Treg population in collagen-induced arthritis (CIA) mouse model. CTLA4-Ig suppressed CIA and increased the CD4+CD25+Foxp3+ Treg population in joint and spleen. When CD11c + DCs and CD4+T cells from CIA mice were cultured with anti-CD3, CTLA4-Ig increased the CD4+CD25 + Foxp3+ Treg population in a TGF-beta-dependent manner. When CD11c + DCs from CIA mice were treated with CTLA4-Ig and adoptively transferred into CIA-induced mice, arthritis did not develop in association with the increase in CD4+CD25+Foxp3+ Treg population. However, in CTLA4-Ig-untreated DC-transferred CIA mice, arthritis developed and then rapidly progressed. Our study demonstrated that CTLA4-Ig suppressed CIA by modifying DCs from CIA mice into tolerogenic DCs to increase the CD4+CD25+Foxp3+ Treg population and this seems to be the new immune regulatory mechanism of CTLA4-Ig.
authors: Division of Rheumatology, Department of Internal Medicine, The Catholic University of Korea, School of Medicine, Seoul, South Korea.
authors: Hyeok-Jae
authors: HJ
authors: Ko
authors: Mi-La
authors: ML
authors: Cho
authors: Seon-Yeong
authors: SY
authors: Lee
authors: Hye-Jwa
authors: HJ
authors: Oh
authors: Yu-Jung
authors: YJ
authors: Heo
authors: Young-Mee
authors: YM
authors: Moon
authors: Chang-Min
authors: CM
authors: Kang
authors: Seung-Ki
authors: SK
authors: Kwok
authors: Ji Hyeon
authors: JH
authors: Ju
authors: Sung-Hwan
authors: SH
authors: Park
authors: Kyung-Su
authors: KS
authors: Park
authors: Ho-Youn
authors: HY
authors: Kim
mesh_terms: D000069594:Abatacept; D019264:Adoptive Transfer; D000818:Animals; D001169:Arthritis, Experimental / Q000276:immunology* / Q000628:therapy; D015704:CD4 Antigens / Q000096:biosynthesis; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D016207:Cytokines / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D003713:Dendritic Cells / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology / Q000637:transplantation; D051858:Forkhead Transcription Factors / Q000096:biosynthesis; D018796:Immunoconjugates / Q000008:administration & dosage*; D053645:Interleukin-2 Receptor alpha Subunit / Q000096:biosynthesis; D008213:Lymphocyte Activation / Q000187:drug effects; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D016176:T-Lymphocyte Subsets / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects / Q000378:metabolism / Q000473:pathology
chemical_list: D015704:CD4 Antigens; D016207:Cytokines; D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D018796:Immunoconjugates; D053645:Interleukin-2 Receptor alpha Subunit; D000069594:Abatacept