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Epithelial-derived TGF-2 modulates basal and wound-healing subepithelial matrix homeostasis

¹Department of Biomedical Engineering, ²Department of Chemical Engineering and Materials Science, ³Beckman Laser Institute, and ⁴Department of Surgery, University of California, Irvine, Irvine, California

Submitted 16 February 2006 ; accepted in final form 1 August 2006

The epithelium influences the mesenchyme during dynamic processes such as embryogenesis, wound healing, fibrosis, and carcinogenesis. Since transforming growth factor- (TGF-) modulates these processes, we hypothesized that epithelial-derived TGF- also plays a critical role in maintaining the extracellular matrix at basal conditions. We utilized an in vitro model of the epithelial-mesenchymal trophic unit in the human airways to determine the role of epithelial-derived TGF- in modulating the extracellular matrix under basal and wound-healing conditions. When differentiated at an air-liquid interface, the human bronchial epithelium produces active TGF-2 at a concentration of 50–70 pg/ml, whereas TGF-1 is undetectable. TGF-2 increases two- to threefold following scrape injury in a dose-dependent fashion and significantly enhances both -smooth muscle actin expression in the underlying collagen-embedded fibroblasts and secretion of tenascin-C into the matrix. Multiphoton microscopy demonstrates substantially enhanced second harmonic generation from fibrillar collagen in the matrix. Pretreatment of the matrix with either sirolimus (2.5 nM) or paclitaxel (10 nM) abolishes the increases in both TGF-2 and second harmonic generation in response to epithelial injury. In the absence of the epithelium, exogenous active TGF-2 (0–400 pg/ml) produces a biphasic response in the second harmonic signal with a minimum occurring at the epithelial-derived basal level. We conclude that epithelial-derived TGF-2 is secreted in response to injury, significantly alters the bulk optical properties of the extracellular matrix, and its tight regulation may be required for normal collagen homeostasis.

extracellular matrix; airway; fibrosis; multiphoton microscopy; fibroblast

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