Rho plays a key role in TGF-beta1-induced cytoskeletal rearrangement in human retinal pigment epithelium.

Abstract:

:Proliferative vitroretinopathy (PVR) is caused by retinal pigment epithelial (RPE) cell proliferation and transformation into fibrotic cells that produce extracellular matrix (ECM) components. Transforming growth factor beta1 (TGF-beta1) is known to play an important role in PVR pathogenesis. To determine how TGF-beta1 mediates the pathogenic changes in RPE cells, we characterized the effects of TGF-beta1 on the morphology, ECM accumulation, and stress fiber formation of ARPE-19 cells, a human RPE cell line. We then elucidated the signaling pathways that mediate these effects. Serum-starved ARPE-19 cells were incubated with 10 ng/ml TGF-beta1 and their morphological changes were examined by phase-contrast microscopy. Actin reorganization was examined by immunochemistry and confocal microscopy. Protein phosphorylation was analyzed by Western blot analysis. TGF-beta1 treatment induced cytoskeleton reorganization, alpha-SMA expression, increased the phosphorylation of ERK, Smad2/3, and AKT, and activated RhoA and Rac1. Cytoskeletal rearrangement was prevented by pretreatment with a Rho inhibitor and by expression of a dominant negative form of Rho. TGF-beta1 also increased LIM kinase and cofilin phosphorylation and the Rho inhibitor blocked this effect. We propose that TGF-beta1 induces human RPE cells to undergo cytoskeletal actin rearrangement via Rho GTPase-dependent pathways that modulate LIM kinase and cofilin activity. This inhibits actin depolymerization and induces the cytoskeletal rearrangements in RPE cells that result in the characteristic features of PVR.

journal_name

J Cell Physiol

authors

Lee J,Ko M,Joo CK

doi

10.1002/jcp.21424

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

520-6

issue

2

eissn

0021-9541

issn

1097-4652

journal_volume

216

pub_type

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