title: Thy-1-integrin alphav beta5 interactions inhibit lung fibroblast contraction-induced latent transforming growth factor-beta1 activation and myofibroblast differentiation.
abstract: Myofibroblasts, key effector cells in tissue fibrosis, are specialized contractile cells. Lung myofibroblast contraction induces integrin alpha(v)beta(5)-dependent latent transforming growth factor (TGF)-beta1 activation suggests that myofibroblast contractility may be a driving force for the persistent myofibroblast differentiation observed in fibrotic lungs. Understanding the mechanisms that regulate fibroblast contraction and mechanotransduction will add new insights into the pathogenesis of lung fibrosis and may lead to new therapeutic approaches for treating fibrotic lung diseases. We and others previously demonstrated that lung fibroblast expression of Thy-1 prevents lung fibrosis. The mechanisms underlying the anti-fibrotic effect of Thy-1 are not well understood. In this study, we showed that Thy-1 interacts with integrin alpha(v)beta(5), both in a cell-free system and on the cell surface of rat lung fibroblasts. Thy-1-integrin alpha(v)beta(5) interactions are RLD-dependent because mutated Thy-1, in which RLD is replaced by RLE, loses the ability to bind the integrin. Furthermore, Thy-1 expression prevents fibroblast contraction-induced, integrin alpha(v)beta(5)-dependent latent TGF-beta1 activation and TGF-beta1-dependent lung myofibroblast differentiation. In contrast, lack of Thy-1 expression or disruption of Thy-1-alpha(v)beta(5) interactions renders lung fibroblasts susceptible to contraction-induced latent TGF-beta1 activation and myofibroblast differentiation. These data suggest that Thy-1-integrin alpha(v)beta(5) interactions inhibit contraction-induced latent TGF-beta1 activation, presumably by blocking the binding of extracellular matrix-bound latent TGF-beta1 with integrin alpha(v)beta(5). Our studies suggest that targeting key mechanotransducers to inhibit mechanotransduction might be an effective approach to inhibit the deleterious effects of myofibroblast contraction on lung fibrogenesis.
authors.affiliation: Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA. yzhou@uab.edu
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: James S
authors.initials: JS
authors.lastname: Hagood
authors.forename: Baogen
authors.initials: B
authors.lastname: Lu
authors.forename: W David
authors.initials: WD
authors.lastname: Merryman
authors.forename: Joanne E
authors.initials: JE
authors.lastname: Murphy-Ullrich
mesh_terms: D020816:Amino Acid Motifs; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D002474:Cell-Free System; D019332:Endothelin-1 / Q000494:pharmacology; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D055767:Immobilized Proteins / Q000378:metabolism; D008168:Lung / Q000166:cytology*; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D032446:Myoblasts / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D010080:Oxazoles / Q000494:pharmacology; D011485:Protein Binding / Q000187:drug effects; D051381:Rats; D019030:Receptors, Vitronectin / Q000378:metabolism*; D012995:Solubility / Q000187:drug effects; D018800:Thy-1 Antigens / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D053773:Transforming Growth Factor beta1 / Q000378:metabolism*
chemical_list: D019332:Endothelin-1; D055767:Immobilized Proteins; D010080:Oxazoles; D019030:Receptors, Vitronectin; D018800:Thy-1 Antigens; D053773:Transforming Growth Factor beta1; C064660:integrin alphaVbeta5
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