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Wang L, Fu Y, Yu B, Jiang X, Liu H, Liu J, Zha B, Chu Y. HSP70, a Novel Regulatory Molecule in B Cell-Mediated Suppression of Autoimmune Diseases. J Mol Biol 2020; 433:166634. [PMID: 32860772 DOI: 10.1016/j.jmb.2020.08.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 08/12/2020] [Accepted: 08/21/2020] [Indexed: 12/12/2022]
Abstract
B cells have recently emerged as playing regulatory role in autoimmune diseases. We have previously demonstrated that human peripheral blood CD19+CD24hiCD27+ B cells have regulatory function both in healthy donors and in patients with autoimmune disease. However, the mechanism of this regulation is still not fully understood. In this study, microarrays were utilized to compare gene expression of CD19+CD24hiCD27+ B cells (regulatory B cells, Bregs) with CD19+CD24loCD27- B cells (non-Bregs) in human peripheral blood. We found that heat shock protein 70 (HSP70) expression was significantly upregulated in Bregs. In vitro studies explored that HSP70 inhibition impaired the regulatory function of peripheral blood Bregs. In mouse models of autoimmune disease, using HSP70-deficient mice or HSP70 inhibitors, Bregs suppressed effector cells and rescued disease-associated phenotypes that were dependent on HSP70. Mechanistically, Bregs secreted HSP70, directly suppressing effector cells, such as T effect cells. These findings reveal that HSP70 is a novel factor that modulates Breg function and suggest that enhancing Breg-mediated production of HSP70 could be a viable therapy for autoimmune disease.
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Affiliation(s)
- Luman Wang
- Department of Immunology, School of Basic Medical Sciences, and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China; Department of Endocrinology and Metabolism, Shanghai Fifth People's Hospital, Fudan University, Shanghai, China; Biotherapy Research Center, Fudan University, Shanghai 200032, China
| | - Ying Fu
- Department of Immunology, School of Basic Medical Sciences, and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Baichao Yu
- Department of Immunology, School of Basic Medical Sciences, and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Xuechao Jiang
- Department of Immunology, School of Basic Medical Sciences, and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Hongchun Liu
- Department of Gastroenterology, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Jun Liu
- Department of Endocrinology and Metabolism, Shanghai Fifth People's Hospital, Fudan University, Shanghai, China
| | - Bingbing Zha
- Department of Endocrinology and Metabolism, Shanghai Fifth People's Hospital, Fudan University, Shanghai, China.
| | - Yiwei Chu
- Department of Immunology, School of Basic Medical Sciences, and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China; Biotherapy Research Center, Fudan University, Shanghai 200032, China.
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Wang H, Xu W, Shao Q, Ding Q. miR-21 silencing ameliorates experimental autoimmune encephalomyelitis by promoting the differentiation of IL-10-producing B cells. Oncotarget 2017; 8:94069-94079. [PMID: 29212210 PMCID: PMC5706856 DOI: 10.18632/oncotarget.21578] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 09/18/2017] [Indexed: 01/04/2023] Open
Abstract
IL-10-producing regulatory B (IL-10+ Breg) cells promote tolerance in autoimmune diseases and transplantation. However, it remains unclear whether microRNAs are involved in the development of IL-10+ Breg cells. Here, we found that microRNA-21 (miR-21) acts as an upstream regulator of IL-10 by targeting the 3' untranslated region of IL-10 mRNA. We also demonstrated that IL-10+ Breg cells exhibit lower miR-21 expression than non-Breg cells and that miR-21 acts as a potent negative regulator of the differentiation of IL-10+ Breg cells. Accordingly, specific inhibition of miR-21 using antisense oligonucleotides markedly promoted B cell IL-10 expression. Thus, IL-10 is a direct target of miR-21. Moreover, silencing of miR-21 significantly alleviated the severity of experimental autoimmune encephalomyelitis (EAE), and this change was associated with an increase in the number of IL-10+ Breg cells. Finally, we demonstrated that miR-21-silenced B cells exert their suppressive activity through effector T cells in an IL-10-dependent manner. Thus, we characterized a B cell-intrinsic microRNA pathway that inhibits the differentiation of IL-10+ Breg cells and promotes autoimmunity. miR-21 silencing therefore represents a new therapeutic strategy for the treatment of autoimmune diseases.
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Affiliation(s)
- Hui Wang
- Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, Department of Immunology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Wenrong Xu
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Qixiang Shao
- Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, Department of Immunology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Qing Ding
- Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, Department of Immunology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
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