Biomechanical stimulation of osteoblast gene expression requires phosphorylation of the RUNX2 transcription factor.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Yan LiRenny T Franceschi

Abstract

Bone can adapt its structure in response to mechanical stimuli. At the cellular level, this involves changes in chromatin organization, gene expression, and differentiation, but the underlying mechanisms are poorly understood. Here we report on the involvement of RUNX2, a bone-related transcription factor, in this process. Fluid flow shear stress loading of preosteoblasts stimulated translocation of extracellular signal-regulated kinase (ERK)/mitogen-activated protein kinase (MAPK) to the nucleus where it phosphorylated RUNX2 on the chromatin of target genes, and increased histone acetylation and gene expression. MAPK signaling and two RUNX2 phosphoacceptor sites, S301 and S319, were critical for this response. Similarly, in vivo loading of mouse ulnae dramatically increased ERK and RUNX2 phosphorylation as well as expression of osteoblast-related genes. These findings establish ERK/MAPK-mediated phosphorylation of RUNX2 as a critical step in the response of preosteoblasts to dynamic loading and define a novel mechanism to explain how mechanical signals induce gene expression in bone.

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Mar 8, 2013·Journal of Bone and Mineral Metabolism·Chao-Yang WangWen Yuan
Mar 9, 2013·Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine·Hong LiJian-Ping Xu
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