Increased transcriptional response to mechanical strain in keloid fibroblasts due to increased focal adhesion complex formation.

Abstract:

:Clinicians have observed that keloids preferentially form in body areas subject to increased skin tension. We hypothesized a difference exists in the transcriptional response of keloid fibroblasts to mechanical strain compared with normal fibroblasts. Normal and keloid fibroblasts were seeded in a device calibrated to deliver a known level of equibiaxial strain. We examined the transcriptional response of TGF-beta isoforms and collagen Ialpha, genes differentially expressed in keloids. Keloid fibroblasts produced more mRNA for TGF-beta1, TGF-beta2, and collagen Ialpha after mechanical strain compared to normals, and this was correlated with protein production. Inhibiting the major mechanical signal transduction pathway with the ERK inhibitor, U0126, blocked upregulation of gene expression. In addition, keloid fibroblasts formed more focal adhesion complexes as measured by immunofluorescence for focal adhesion kinase, integrin beta1, and vinculin. Finally, there is increased activation of focal adhesion kinase when we detected the phosphorylated form of focal adhesion kinase with immunofluorescence and immunoblotting. In summary, keloid fibroblasts have an exaggerated response to mechanical strain compared to normal fibroblasts leading to increased production of pro-fibrotic growth factors. This may be one molecular mechanism for the development of keloids.

journal_name

J Cell Physiol

authors

Wang Z,Fong KD,Phan TT,Lim IJ,Longaker MT,Yang GP

doi

10.1002/jcp.20486

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

510-7

issue

2

eissn

0021-9541

issn

1097-4652

journal_volume

206

pub_type

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