title: Myeloid deletion of SIRT1 suppresses collagen-induced arthritis in mice by modulating dendritic cell maturation.
abstract: The type III histone deacetylase silent information regulator 1 (SIRT1) is an enzyme that is critical for the modulation of immune and inflammatory responses. However, the data on its role in rheumatoid arthritis (RA) are limited and controversial. To better understand how SIRT1 regulates adaptive immune responses in RA, we evaluated collagen-induced arthritis (CIA) in myeloid cell-specific SIRT1 knockout (mSIRT1 KO) and wild-type (WT) mice. Arthritis severity was gauged on the basis of clinical, radiographic and pathologic scores. Compared with their WT counterparts, the mSIRT1 KO mice exhibited less severe arthritis, which was less destructive to the joints. The expression levels of inflammatory cytokines, matrix metalloproteinases and ROR-γT were also reduced in the mSIRT1 KO mice compared with the WT mice and were paralleled by reductions in the numbers of Th1 and Th17 cells and CD80- or CD86-positive dendritic cells (DCs). In addition, impaired DC maturation and decreases in the Th1/Th17 immune response were observed in the mSIRT1 KO mice. T-cell proliferation was also investigated in co-cultures with antigen-pulsed DCs. In the co-cultures, the DCs from the mSIRT1 KO mice showed decreases in T-cell proliferation and the Th1/Th17 immune response. In this study, myeloid cell-specific deletion of SIRT1 appeared to suppress CIA by modulating DC maturation. Thus, a careful investigation of DC-specific SIRT1 downregulation is needed to gauge the therapeutic utility of agents targeting SIRT1 in RA.
authors.affiliation: Departments of Biochemistry, Jeonju, Jeonbuk, Republic of Korea.
authors.forename: Seong Ji
authors.initials: SJ
authors.lastname: Woo
authors.affiliation: Division of Biotechnology, College of Environmental & Bioresource Sciences, Chonbuk National University, Jeonju, Jeonbuk, Republic of Korea.
authors.forename: Sang-Myeong
authors.initials: SM
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Gyeongnam, Republic of Korea.
authors.forename: Hye Song
authors.initials: HS
authors.lastname: Lim
authors.affiliation: Clinical Research Institute, Gyeongsang National University Hospital, Jinju, Gyeongnam, Republic of Korea.
authors.forename: Young-Sool
authors.initials: YS
authors.lastname: Hah
authors.affiliation: Department of Immunology, Laboratory of Dendritic Cell Differentiation and Regulation, School of Medicine, Konkuk University, Chungju, Chungbuk, Republic of Korea.
authors.forename: In Duk
authors.initials: ID
authors.lastname: Jung
authors.affiliation: Department of Immunology, Laboratory of Dendritic Cell Differentiation and Regulation, School of Medicine, Konkuk University, Chungju, Chungbuk, Republic of Korea.
authors.forename: Yeong-Min
authors.initials: YM
authors.lastname: Park
authors.affiliation: Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Gyeongnam, Republic of Korea.
authors.forename: Hyun-Ok
authors.initials: HO
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Gyeongnam, Republic of Korea.
authors.forename: Yun-Hong
authors.initials: YH
authors.lastname: Cheon
authors.affiliation: Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Gyeongnam, Republic of Korea.
authors.forename: Min-Gyu
authors.initials: MG
authors.lastname: Jeon
authors.affiliation: Pathology, Chonbuk National University Medical School, Jeonju, Jeonbuk, Republic of Korea.
authors.forename: Kyu Yun
authors.initials: KY
authors.lastname: Jang
authors.affiliation: Pathology, Chonbuk National University Medical School, Jeonju, Jeonbuk, Republic of Korea.
authors.forename: Kyeong Min
authors.initials: KM
authors.lastname: Kim
authors.affiliation: Departments of Biochemistry, Jeonju, Jeonbuk, Republic of Korea.
authors.forename: Byung-Hyun
authors.initials: BH
authors.lastname: Park
authors.affiliation: Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Gyeongnam, Republic of Korea.
authors.forename: Sang-Il
authors.initials: SI
authors.lastname: Lee
mesh_terms: D000818:Animals; D001169:Arthritis, Experimental / Q000175:diagnosis / Q000209:etiology* / Q000378:metabolism*; D002454:Cell Differentiation; D018920:Coculture Techniques; D016207:Cytokines / Q000235:genetics / Q000378:metabolism; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D004195:Disease Models, Animal; D017353:Gene Deletion; D005786:Gene Expression Regulation; D006801:Humans; D018836:Inflammation Mediators / Q000378:metabolism; D008198:Lymph Nodes / Q000276:immunology / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D022423:Myeloid Cells / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism; D056564:Sirtuin 1 / Q000235:genetics*; D013585:Synovitis / Q000235:genetics / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D018417:Th1 Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D058504:Th17 Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D018808:Transcription Factor AP-1 / Q000378:metabolism
chemical_list: D016207:Cytokines; D018836:Inflammation Mediators; D016328:NF-kappa B; D018808:Transcription Factor AP-1; D056564:Sirtuin 1