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  • Title: Accelerated re-epithelialization in beta3-integrin-deficient- mice is associated with enhanced TGF-beta1 signaling.
    Author: Reynolds LE, Conti FJ, Lucas M, Grose R, Robinson S, Stone M, Saunders G, Dickson C, Hynes RO, Lacy-Hulbert A, Hodivala-Dilke K.
    Journal: Nat Med; 2005 Feb; 11(2):167-74. PubMed ID: 15654327.
    Abstract:
    The upregulation of TGF-beta1 and integrin expression during wound healing has implicated these molecules in this process, but their precise regulation and roles remain unclear. Here we report that, notably, mice lacking beta(3)-integrins show enhanced wound healing with re-epithelialization complete several days earlier than in wild-type mice. We show that this effect is the result of an increase in TGF-beta1 and enhanced dermal fibroblast infiltration into wounds of beta(3)-null mice. Specifically, beta(3)-integrin deficiency is associated with elevated TGF-beta receptor I and receptor II expression, reduced Smad3 levels, sustained Smad2 and Smad4 nuclear localization and enhanced TGF-beta1-mediated dermal fibroblast migration. These data indicate that alpha(v)beta(3)-integrin can suppress TGF-beta1-mediated signaling, thereby controlling the rate of wound healing, and highlight a new mechanism for TGF-beta1 regulation by beta(3)-integrins.
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