Document Detail

The TNFα-induced miR-18a activates rheumatoid arthritis synovial fibroblasts through a feedback loop in NF-κB signaling.
MedLine Citation:
PMID:  23280137     Owner:  NLM     Status:  Publisher    
Objective: To elucidate whether the microRNA (miRNA) cluster miR-17-92 contributes to the activated phenotype of rheumatoid arthritis synovial fibroblasts (RASF). Methods: RASF were stimulated with tumor necrosis factor alpha (TNFα? and expression and regulation of the miR-17-92 cluster were studied using quantitative real-time PCR (qPCR) and promoter activity assays. RASF were transfected with single precursor molecules of miRNAs from miR-17-92 and the expression of matrix-degrading enzymes and cytokines was measured by qPCR and enzyme-linked immunosorbent assay. Potential miRNA targets were identified by computational prediction and validated using reporter gene assays and Western blot. The activity of NF-κB signaling was determined by reporter gene assay. Results: We found that TNFα induces the expression of miR-17-92 in RASF in a nuclear factor kappa B (NF-κB)-dependent manner. Transfection of RASF with precursor molecules of single members of miR-17-92 revealed significantly increased expression levels of matrix-degrading enzymes, proinflammatory cytokines and chemokines in pre-miR-18a-transfected RASF. Using reporter gene assays we identified the NF-κB pathway inhibitor TNFα-induced protein 3 (TNFAIP3) as a new target of miR-18a. In consequence, pre-miR-18a-transfected RASF showed stronger activation of NF-κB signaling, both constitutively and in response to TNFα-stimulation. Conclusion: Our data suggest that the miR-17-92-derived miR-18a contributes to cartilage destruction and chronic inflammation in the joint through a positive feedback loop in NF-κB signaling with concomitant upregulation of matrix-degrading enzymes and inflammatory mediators in RASF. © 2012 American College of Rheumatology.
Michelle Trenkmann; Matthias Brock; Renate E Gay; Beat A Michel; Steffen Gay; Lars C Huber
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-28
Journal Detail:
Title:  Arthritis and rheumatism     Volume:  -     ISSN:  1529-0131     ISO Abbreviation:  Arthritis Rheum.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-1-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370605     Medline TA:  Arthritis Rheum     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 by the American College of Rheumatology.
Center of Experimental Rheumatology, University Hospital Zurich and Zurich Center of Integrative Human Physiology (ZIHP), CH-8091, Switzerland.
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