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Yang CR, Ding HJ, Yu M, Zhou FH, Han CY, Liang R, Zhang XY, Zhang XL, Meng FJ, Wang S, Li DD, Sun WZ, Meng B, Zhou XF. proBDNF/p75NTR promotes rheumatoid arthritis and inflammatory response by activating proinflammatory cytokines. FASEB J 2022; 36:e22180. [PMID: 35129860 DOI: 10.1096/fj.202101558r] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/15/2021] [Accepted: 01/05/2022] [Indexed: 11/11/2022]
Abstract
P75 pan-neurotrophin receptor (p75NTR) is an important receptor for the role of neurotrophins in survival and death of neurons during development and after nerve injury. Our previous research found that the precursor of brain-derived neurotrophic factor (proBDNF) regulates pain as an inflammatory mediator. The current understanding of the role of proBDNF/p75NTR signaling pathway in inflammatory arthritis pain and rheumatoid arthritis (RA) is unclear. We recruited 20 RA patients, 20 healthy donors (HDs), and 10 osteoarthritis (OA) patients. Hematoxylin and eosin (H&E) staining and immunohistochemistry (IHC) of proBDNF and p75NTR in synovial membrane were performed and evaluated. We next examined the mRNA and protein expression of proBDNF/p75NTR signaling pathway in peripheral blood mononuclear cells (PBMCs) and synovial tissue. ELISA and flow cytometry were assessed between the blood of RA patients and HD. To induce RA, collagen-induced arthritis (CIA) were induced in mice. We found over-synovitis of RA synovial membrane compared to OA controls in histologic sections. P75NTR and sortilin mRNA, and proBDNF protein level were significantly increased in PBMCs of RA patients compared with the HD. Consistently, ELISA showed that p75NTR, sortilin, tumor necrosis factor α (TNF-α), interleukin-1β (IL-1β), interleukin-6 (IL-6), and interleukin-10 (IL-10) levels in the serum of RA patients were increased compared with HD and p75NTR, sortilin were positively correlated with Disease Activity Score in 28 joints (DAS28). In addition, using flow cytometry we showed that the increased levels of proBDNF and p75NTR characterized in CD4+ and CD8+ T cells of RA patients were subsequently reversed with methotrexate (MTX) treatment. Furthermore, we found pathological changes, inflammatory pain, upregulation of the mRNA and protein expression of proBDNF/p75NTR signaling pathway, and upregulation of inflammatory cytokines in spinal cord using a well-established CIA mouse model. We showed intravenous treatment of recombinant p75ECD-Fc that biologically blocked all inflammatory responses and relieved inflammatory pain of animals with CIA. Our findings showed the involvement of proBDNF/p75NTR pathway in the RA inflammatory response and how blocking it with p75ECD-Fc may be a promising therapeutic treatment for RA.
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Affiliation(s)
- Chun-Rui Yang
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, P. R. China.,Department of Pathology, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Hong-Jun Ding
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, P. R. China.,Tianjin Public Security Profession College, Tianjin, P. R. China
| | - Miao Yu
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, P. R. China
| | - Fiona-H Zhou
- Faculty of Health Sciences, School of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| | - Chen-Yang Han
- Pain Treatment Center, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Rui Liang
- Department of Pathology, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Xiao-Yang Zhang
- Department of Pathology, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Xiang-Lian Zhang
- Department of Pathology, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Fan-Jie Meng
- Department of Thoracic Surgery, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Shuo Wang
- Department of Thoracic Surgery, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - De-Dong Li
- Department of Anesthesiology, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Wei-Zong Sun
- Department of Orthopedics, Tianjin Medical University Second Hospital, Tianjin, P. R. China
| | - Bin Meng
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, P. R. China
| | - Xin-Fu Zhou
- Health and Biomedical Innovation, Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, Australia
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