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Keratinocyte conditioned medium stimulates type IV collagenase synthesis in cultured human keratinocytes and fibroblasts
Author(s) -
KRATZ G.,
JANSSON K.,
GIDLUND M.,
HÆGERSTR A.
Publication year - 1995
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/j.1365-2133.1995.tb06914.x
Subject(s) - collagenase , paracrine signalling , autocrine signalling , keratinocyte , wound healing , human skin , microbiology and biotechnology , fibroblast , granulation tissue , cell culture , microbial collagenase , biology , chemistry , in vitro , immunology , biochemistry , receptor , enzyme , genetics
Summary We have previously shown that conditioned medium from cultured human keratinocytes stimulates proliferation of a variety of cell types involved in wound healing. as well as re‐epithelization of wounds in human skin in vitro . We now present evidence for an autocrine/paracrine control of the synthesis of type IV collagenases in human keratinocytes and fibroblasts. During wound healing, keratinocytes migrate over the wound bed, an activity coupled with lysis of basement membranes, and hence requiring the presence of collagenases. Collagenases are also needed for the production and remodelling of the granulation tissue. In order to study the autocrine/paracrine control of collagenase production in keratinocytes and fibroblasts, we stimulated these cells in culture with conditioned medium from cultured keratinocytes. Protease synthesis was determined by affinity labelling with 3 H‐diisopropylfluorophosphoridate (DFP) and by zymography. Keratinocyte‐conditioned medium was found to increase the expression of 72 and 92 kDa type IV collagenase in human keratinocytes, and the 72 kDa collagenase in human fibroblasts. indicating that an autocrine/paracrine control mechanism is involved in collagenase production in these cell types during wound healing. This increased expression of collagenases could he partly responsible for the stimulated healing seen in wounds treated with sheets of cultured keratinocytes.