Inhibition of Runx2 Signaling by TNF-α in ST2 Murine Bone Marrow Stromal Cells Undergoing Osteogenic Differentiation

Overview

Journal In Vitro Cell Dev Biol Anim

Publisher Springer

Specialties Biology
Cell Biology

Date 2016 Jul 13

PMID 27401008

Citations 10

Authors

Xin Ye

Haiyun Huang

Ning Zhao

Jin Zhang

Pishan Yang

Affiliations

Soon will be listed here.

Abstract

Tumor necrosis factor-alpha (TNF-α) inhibits osteogenic differentiation of murine bone marrow stromal cells, and transcription factor Runx2 serves as an essential regulation target in the process. The underlying mechanism may involve the regulation of Runx2 expression and the Runx2 activity in downstream gene transcription, which has not been fully elucidated. In this study, ST2 murine bone marrow-derived stromal cells were treated with bone morphogenetic protein-2 (BMP-2) and/or TNF-α in osteogenic medium, and the expression of Runx2 was estimated. Cells were transfected with Runx2, p65, inhibitor of κBα (IκBα), 9.0 kb bone sialoprotein (BSP) promoter-luciferase or osteoblast-specific cis-acting element 2 (OSE2)-luciferase reporter vectors, and then real time-PCR and dual luciferase analysis were used to investigate the effect of TNF-α on Runx2-activated osteogenic gene transcription and the molecular mechanism. We found that TNF-α inhibited BMP-2-induced osteogenic marker expression and both the spontaneous and BMP-2-induced Runx2 expression. TNF-α stimulation or overexpression of nuclear factor-kappa B (NF-κB) p65 subunit repressed the Runx2-activated BSP and osteocalcin (OC) transcriptions. The Runx2-induced 9.0 kb BSP promoter activity was attenuated by TNF-α or p65, while the OSE2 activity was not affected. Besides, blockage of NF-κB by IκBα overexpression eliminated these inhibitory effects of TNF-α on Runx2 signaling. These results suggest that in murine bone marrow stromal cells undergoing osteogenic differentiation, TNF-α and it activated NF-κB pathway inhibit the expression of Runx2 gene, and suppress the Runx2-mediated osteogenic gene transcription via the 9.0 kb BSP promoter.

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