Objectives: Cadherin-11 (CDH11) is an adhesion molecule that anchors β-catenin and is involved with various functions of synovial fibroblast cells (SFCs) during the development of rheumatoid arthritis (RA). However, the mechanism of CDH11 during RA-SFC proliferation is unclear. The aim of our study was to clarify the involvement of CDH11 and β-catenin signalling during proliferation.
Methods: IL-1β-induced and tumour necrosis factor-α (TNF-α)-induced cell proliferation, with CDH11 siRNAs, β-catenin-specific siRNAs and a CDH11-neutralizing antibody, were assessed by 5-Bromo-2'-deoxy-uridine ELISA.
Key Findings: Using CDH11 siRNAs, there were a 42% reduction in IL-1β-induced proliferation and a 64% reduction in β-catenin protein. When β-catenin siRNAs were applied, there was a 63% reduction in IL-1β-induced proliferation. The median effective concentration (EC50 ) values for IL-1β-induced proliferation via CDH11-mediated β-catenin-dependent, total β-catenin-dependent and β-catenin-independent signalling were 0.0015, 0.016 and 0.18 ng/ml, respectively. Blocking CDH11 ligation with a CDH11-neutralizing antibody did not decrease IL-1β-induced proliferation.
Conclusions: CDH11-mediated β-catenin signalling was 42% involved in IL-1β-induced proliferation and had the highest susceptibility to IL-1β among the proliferative signallings analysed in this study. The mode of action for CDH11 during the cell proliferation was likely associated with a pool of β-catenin protein. In contrast, CDH11 and β-catenin were not involved in TNF-α-induced RA-SFC proliferation.
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