Exp Mol Med.
2016 Mar;48(3):e221. 10.1038/emm.2015.124.
Myeloid deletion of SIRT1 suppresses collagen-induced arthritis in mice by modulating dendritic cell maturation
- Affiliations
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- 1Department of Biochemistry, Jeonju, Jeonbuk, Republic of Korea. bhpark@jbnu.ac.kr
- 2Division of Biotechnology, College of Environmental & Bioresource Sciences, Chonbuk National University, Jeonju, Jeonbuk, Republic of Korea.
- 3Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Gyeongnam, Republic of Korea. goldgu@gnu.ac.kr
- 4Clinical Research Institute, Gyeongsang National University Hospital, Jinju, Gyeongnam, Republic of Korea.
- 5Department of Immunology, Laboratory of Dendritic Cell Differentiation and Regulation, School of Medicine, Konkuk University, Chungju, Chungbuk, Republic of Korea.
- 6Department of Pathology, Chonbuk National University Medical School, Jeonju, Jeonbuk, Republic of Korea.
- KMID: 2361508
- DOI: http://doi.org/10.1038/emm.2015.124
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.
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