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Title: Increased transcriptional response to mechanical strain in keloid fibroblasts due to increased focal adhesion complex formation
Authors: Wang, Z.
Fong, K.D.
Phan, T.-T. 
Lim, I.J. 
Longaker, M.T.
Yang, G.P.
Issue Date: Feb-2006
Citation: Wang, Z., Fong, K.D., Phan, T.-T., Lim, I.J., Longaker, M.T., Yang, G.P. (2006-02). Increased transcriptional response to mechanical strain in keloid fibroblasts due to increased focal adhesion complex formation. Journal of Cellular Physiology 206 (2) : 510-517. ScholarBank@NUS Repository.
Abstract: Clinicians have observed that keloids preferentially form in body areas subject to increased skin tension. We hypothesized a difference exists in thetranscriptional response of keloid fibroblaststo 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-β isoforms and collagen Iα, genes differentially expressed in keloids. Keloid fibroblasts produced more mRNA for TGF-β1, TGF-β2, and collagen Iα 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 β1, 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 maybe one molecular mechanism for the development of keloids. © 2005 Wiley-Liss, Inc.
Source Title: Journal of Cellular Physiology
ISSN: 00219541
DOI: 10.1002/jcp.20486
Appears in Collections:Staff Publications

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