Human keratinocyte growth factor effects in a porcine model of epidermal wound healing

doi:10.1084/jem.178.3.865

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JOURNAL ARTICLE

Human keratinocyte growth factor effects in a porcine model of epidermal wound healing

L. Staiano-Coico, J. G. Krueger, J. S. Rubin, S. D'limi, V. P. Vallat, L. Valentino, T. Fahey 3rd, A. Hawes, G. Kingston, M. R. Madden, M. Mathwich, A. Gottlieb and S. A. Aaronson
Department of Surgery, Cornell University Medical College, New York 10021.

Keratinocyte growth factor (KGF) is a member of the fibroblast growth factor (FGF) family (hence the alternative designation FGF-7). It is produced by stromal cells, but acts as a mitogen for epithelial cells. We examined the effects of topically applied KGF on healing of wounds in a porcine model. In partial-thickness wounds, KGF stimulated the rate of reepithelialization (p < 0.0002), associated with a thickening of the epidermis (p < 0.0001). Epidermis from KGF-treated full-thickness wound sites was significantly thicker (0.31 +/- 0.22 mm) compared with mirror image control sites (0.18 +/- 0.12 mm) (p < 0.0001). Moreover, the majority (77%) of KGF-treated wounds exhibited epidermis with a deep rete ridge pattern as compared with control sites. These effects were observed as early as 14 d and persisted for at least 4 wk. KGF treatment also increased the number of serrated basal cells associated with increased deposition of collagen fibers in the superficial dermis adjacent to the acanthotic epidermis. Electron microscopy revealed better developed hemidesmosomes associated with thicker bundles of tonofilaments in the serrated cells. The pattern of epidermal thickening observed in KGF-treated wounds resembled psoriasis. Psoriasis is a disease associated with epidermal thickening, parakeratosis as well as hyperproliferation that extends beyond the basal layer. In striking contrast to psoriasis, KGF-treated wounds exhibited normal orthokeratotic maturation, and proliferation was localized to the basal cells. Our present findings have significant implications concerning the role of KGF as a paracrine modulator of epidermal proliferation and differentiation.
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