Activation of RhoA and FAK Induces ERK-mediated Osteopontin Expression in Mechanical Force-subjected Periodontal Ligament Fibroblasts

Overview

Journal Mol Cell Biochem

Publisher Springer

Specialty Biochemistry

Date 2009 Oct 3

PMID 19798549

Citations 26

Authors

So-Yeon Hong

Young-Mi Jeon

Hyun-Jung Lee

Jong-Ghee Kim

Jin-A Baek

Jeong-Chae Lee

Affiliations

Soon will be listed here.

Abstract

The precise mechanism by which Rho kinase translates the mechanical signals into OPN up-regulation in force-exposed fibroblasts has not been elucidated. Human periodontal ligament fibroblasts (hPLFs) were exposed to mechanical force by centrifuging the culture plates at a magnitude of 50 g/cm(2) for 60 min. At various times of the force application, they were processed for analyzing cell viability, trypan blue exclusion, and OPN expression at protein and RNA levels. Cellular mechanism(s) of the force-induced OPN up-regulation was also examined using various kinase inhibitors or antisense oligonucleotides specific to mechanosensitive factors. Centrifugal force up-regulated OPN expression and induced a rapid and transient increase in the phosphorylation of focal adhesion kinase (FAK), extracellular signal-regulated kinase (ERK), and Elk1. Pharmacological blockade of RhoA/Rho-associated coiled coil-containing kinase (ROCK) signaling markedly reduced force-induced FAK and ERK1/2 phosphorylation. Transfecting hPLFs with FAK antisense oligonucleotide diminished ERK1/2 activation and force-induced OPN expression. Further, ERK inhibitor inhibited significantly OPN expression, Elk1 phosphorylation, and activator protein-1 (AP-1)-DNA binding activation, but not FAK phosphorylation, in the force-applied cells. These results demonstrate that FAK signaling plays critical roles in force-induced OPN expression in hPLFs through interaction with Rho/ROCK as upstream effectors and ERK-Elk1/ERK-c-Fos as downstream effectors.

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