Abstract:
:Elevated levels of follistatin-like protein 1 (FSTL1) have been found both in mouse models for human rheumatoid arthritis (RA) and collagen-induced arthritis (CIA). In this study, we elucidated the potential mechanisms by which FSTL1 contributes to the pathogenesis of RA. Fibroblast-like synoviocytes (FLSs) were established from synovial tissues of RA patients and stimulated with human recombinant FSTL1. Protein and mRNA expression levels of select matrix metalloproteinases (i.e., MMP1, MMP3, MMP13) in FLS were measured by, respectively, real-time RT-qPCR and ELISA. Activation of MAPK and other pathways that affect MMPs were evaluated by Western blotting. We also compared concentrations of MMPs in plasma in RA patients versus healthy controls (HC). Expression levels of MMP1, MMP3, and MMP13 were clearly stimulated by FSTL1 in vitro. FSTL1 activated the inflammation-related NF-κB signaling pathway, as well as all three mitogen-activated protein kinase (MAPK) pathways and the JAK/STAT3 pathway. Moreover, select chemical inhibitors that target p38 (SB203580), Erk1/2 (SP600125), JNK (SCH772984), STAT3 (AG490), and NF-κB (BAY 11-7082) significantly attenuated MMP expression. Inhibition of Toll-like receptor 4 by compound TAK-242 significantly abolished those effects of FSTL1. Importantly, elevated plasma concentrations of MMP3 were found to correlate with plasma FSTL1 levels in RA patients. These findings suggest that FSTL1 accelerates RA progression by activating MAPK, JAK/STAT3, and NF-κB pathways to enhance secretion of different MMPs and this enhancement is via TLR4. Targeting FSTL1 may provide a promising pharmacological drug therapy to ameliorate RA symptoms and perhaps reverse disease progression.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Ni S,Li C,Xu N,Liu X,Wang W,Chen W,Wang Y,van Wijnen AJdoi
10.1002/jcp.26580subject
Has Abstractpub_date
2018-01-01 00:00:00pages
454-463issue
1eissn
0021-9541issn
1097-4652journal_volume
234pub_type
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