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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2015 ; 211
(1
): 173-90
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Conformational coupling of integrin and Thy-1 regulates Fyn priming and
fibroblast mechanotransduction
#MMPMID26459603
Fiore VF
; Strane PW
; Bryksin AV
; White ES
; Hagood JS
; Barker TH
J Cell Biol
2015[Oct]; 211
(1
): 173-90
PMID26459603
show ga
Progressive fibrosis is characterized by excessive deposition of extracellular
matrix (ECM), resulting in gross alterations in tissue mechanics. Changes in
tissue mechanics can further augment scar deposition through fibroblast
mechanotransduction. In idiopathic pulmonary fibrosis, a fatal form of
progressive lung fibrosis, previous work has shown that loss of Thy-1 (CD90)
expression in fibroblasts correlates with regions of active fibrogenesis, thus
representing a pathologically relevant fibroblast subpopulation. We now show that
Thy-1 is a regulator of fibroblast rigidity sensing. Thy-1 physically couples to
inactive ?v?3 integrins via its RGD-like motif, altering baseline integrin
avidity to ECM ligands and also facilitating preadhesion clustering of integrin
and membrane rafts via Thy-1's glycophosphatidylinositol tether. Disruption of
Thy-1-?v?3 coupling altered recruitment of Src family kinases to adhesion
complexes and impaired mechanosensitive, force-induced Rho signaling, and
rigidity sensing. Loss of Thy-1 was sufficient to induce myofibroblast
differentiation in soft ECMs and may represent a physiological mechanism
important in wound healing and fibrosis.