Implication of Receptor Activator of NF-κB Ligand in Wnt/β-catenin Pathway Promoting Osteoblast-like Cell Differentiation

Overview

Journal J Huazhong Univ Sci Technolog Med Sci

Specialty General Medicine

Date 2012 Dec 29

PMID 23271279

Citations 4

Authors

Bin Nie

Shaoqiong Zhou

Xin Fang

Wei Li

Bin Wang

Siming Guan

Affiliations

Soon will be listed here.

Abstract

Recent studies showed that activation of Wnt/β-catenin pathway promoted the differentiation of osteoblast-like cells in the arterial calcification, but its mechanism remains unknown. In this study, the hypothesis that Wnt/β-catenin pathway promotes the differentiation of osteoblast-like cells by upregulating the expression of receptor activator of NF-κB ligand (RANKL) was examined. LiCl was used to activate the Wnt/β-catenin pathway. The differentiation of osteoblast-like cells was observed by Von Kossa staining, calcium content assay, alkaline phosphatase (ALP) activity assay, and detection of osteocalcin expression. Real-time PCR was performed to detect the expression of RANKL and osteoprotegerin (OPG, the decoy receptor of RANKL) during the osteoblast-like cell differentiation. Different concentrations of OPG were added to the culture media respectively to inhibit the function of RANKL, and the change in the differentiation of osteoblast-like cells was evaluated. The results showed that when the Wnt/β-catenin pathway was activated by LiCl, the expression of RANKL was significantly increased, which coincided with the differentiation of osteoblast-like cells (P<0.05), and the OPG treatment could partly attenuate the promoting effect of Wnt/β-catenin pathway on the differentiation of osteoblast-like cells (P<0.05), but it failed to completely abolish such effect. It was concluded that activation of Wnt/β-catenin pathway promotes the differentiation of osteoblast-like cells by both RANKL-dependent and RANKL-independent mechanisms.

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