Abstract:
:Activated macrophages exhibiting diverse phenotypes and various functions contribute to the pathogenesis or amelioration of different diseases like cancer, inflammation, and infectious and autoimmune diseases. However, the mechanisms of macrophage polarization in inflamed joint and its effects on rheumatoid arthritis (RA) are still not clarified. This study is designed to explore the effects of cyclophilin A (CypA) on macrophage polarization and describe the underlying mechanisms. Collagen-induced arthritis (CIA) was employed to address the pro-arthritic effects of CypA. Flow cytometry was performed to investigate the populations of M1 and M2 macrophages in synovial tissues of the mice. Knockdown or overexpression of CypA macrophage cells was used to study the functions of CypA on macrophage polarization. Western blot was carried out to examine the potential signaling pathways. We found that CypA aggravated the severity of CIA in mice, as assessed by the increase of clinical score of inflammation, cartilage damage, and bone erosion. Moreover, the level of cytokines, such as IL-6, IL-1β, and IL-17, and the number of pro-inflammatory macrophages in synovial fluid were significantly elevated. In accordance with our observation, CypA dysregulation could actually influence the M1 macrophages polarization and pro-inflammatory cytokines production. Further mechanism study disclosed that CypA could regulate the transcriptional activity of NF-κB, the pivotal transcriptional factor regulating M1 polarization, dependent of its PPIase activity. Our findings provide evidence that PPIase CypA promoted macrophages polarization toward pro-inflammatory M1 phenotype via transcriptional activating NF-κB, thus leading to aggravated arthritis.
journal_name
Inflammationjournal_title
Inflammationauthors
Dongsheng Z,Zhiguang F,Junfeng J,Zifan L,Li Wdoi
10.1007/s10753-017-0619-0subject
Has Abstractpub_date
2017-10-01 00:00:00pages
1761-1772issue
5eissn
0360-3997issn
1573-2576pii
10.1007/s10753-017-0619-0journal_volume
40pub_type
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