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- W2024375334 abstract "The cellular distribution of mRNAS for urokinase-type plasminogen activator (uPA), its specific receptor (uPAR), and its inhibitors (PAI-1 and -2) in mouse skin was analyzed by in situ hybridization after topical application of the tumor promoter phorbol 12-myristate 13-acetate. In the epidermis, strong signals for uPA and PAI-1 mRNA were detected 24 h after treatment in the basal and suprabasal epidermal keratinocytes in areas with pronounced hyperproliferation and increased terminal differentiation, and in some hair follicle keratinocytes. After 48 h, both uPAR and PAI-2 mRNAs were expressed in the epidermal layers from the suprabasal keratinocytes up to the differentiating cells beneath the cornified layer and in hair follicle keratinocytes. Induction of PAI-2 mRNA was detected in epidermis as early as 3 h after treatment and remained stable for up to 7 days. In the dermis, 5 h after application of phorbol 12-myristate 13-acetate to the skin, uPA mRNA was detected in fibroblast-like cells below and around the skin muscle, and PAI-1 mRNA was detected in stromal cells located above the skin muscle. After longer exposure to phorbol 12-myristate 13-acetate, the PAI-1 mRNA-expressing stromal cells were located more superficially, apparently moving toward the epidermal layer. After 9 h, most of the PAI-1 mRNA-positive cells were identified as endothelial cells. Up to 24 h after the application of phorbol 12-myristate 13-acetate, the intensity of the signal for both uPA and PAI-1 increased, followed by a gradual decrease for up to 7 days. These results show that in mouse skin treated with a tumor-promoting phorbol ester, the various components of the plasminogen activation system are expressed by both epithelial and stromal cell types, which in dermis and subcutis are located in different places, depending on the time of exposure to the phorbol ester. Our results suggest that urokinase-mediated extracellular proteolysis has diverse functional roles during the early steps of tumor promotion." @default.
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- W2024375334 date "1996-04-01" @default.
- W2024375334 modified "2023-10-14" @default.
- W2024375334 title "Differential Expression of Urokinase-Type Plasminogen Activator, Its Receptor, and Inhibitors in Mouse Skin After Exposure to a Tumor-Promoting Phorbol Ester" @default.
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- W2024375334 doi "https://doi.org/10.1111/1523-1747.ep12345425" @default.
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