Osteopontin expression is required for myofibroblast differentiation.

Abstract:

:Osteopontin (OPN) is a multifunctional cytokine that is strongly expressed in healing wounds and fibrotic lesions, both of which are characterized by the formation of myofibroblasts. We examined the role of OPN in myofibroblast differentiation induced by the profibrotic cytokine transforming growth factor-beta1. In cultured cardiac or dermal fibroblasts treated with transforming growth factor-beta1, there was a 2- to 5-fold increase in the expression of the myofibroblast markers alpha-smooth muscle actin and extradomain A fibronectin but no significant increase of these proteins in OPN-null fibroblasts. Phalloidin staining for actin filaments and immunostaining for alpha-smooth muscle actin and focal adhesion proteins showed reduced stress fibers, focal adhesions, and lamellipodia in OPN-null fibroblasts compared with wild-type cells. OPN-null fibroblasts exhibited 40% to 60% less spreading, 50% less resistance to detachment by shear force, and a approximately 3-fold reduction in collagen gel contraction. These defects were partially rescued by ectopic expression of OPN. Mass spectrometric analysis of proteins in focal adhesions formed on collagen type I beads revealed an enrichment of HMGB1 protein in wild-type cells, whereas HMGB1 was not detected in OPN-null cells. Treatment of wild-type cells with small interfering RNA to knock down OPN reduced transforming growth factor-beta1-induced alpha-smooth muscle actin and HMGB1 to levels observed in OPN-null cells. These studies demonstrate that OPN is required for the differentiation and activity of myofibroblasts formed in response to the profibrotic cytokine transforming growth factor-beta1.

journal_name

Circ Res

journal_title

Circulation research

authors

Lenga Y,Koh A,Perera AS,McCulloch CA,Sodek J,Zohar R

doi

10.1161/CIRCRESAHA.107.160408

subject

Has Abstract

pub_date

2008-02-15 00:00:00

pages

319-27

issue

3

eissn

0009-7330

issn

1524-4571

pii

CIRCRESAHA.107.160408

journal_volume

102

pub_type

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