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• W2065850453 abstract "Calcitonin (CT) is synthesized and secreted in prostate epithelium, and its secretion from malignant prostates is several folds higher than that in benign prostates. CT receptor (CTR) is expressed in malignant prostate epithelium, and its activation increases invasiveness of prostate cancer (PC) cells via activation of protein kinase A. Since the role of urokinase-type plasminogen activator (uPA) in invasion of PC has been established, we tested the hypothesis that CT increases invasion of PC cells by stimulating uPA secretion from PC cells. Exogenously added CT stimulated the secretion of uPA from PC-3M cells in a dose-dependent manner, which was blocked by Rp.cAMP, a competitive inhibitor of protein kinase A. CT stimulated the secretion of MMP-2 and MMP-9 from PC-3M cells, and also increased their invasiveness. Both these actions of CT were blocked by uPA-neutralizing antibodies. Immunofluorescence studies with PC-3M cells suggest that CT stimulated redistribution of cellular uPA to focal adhesion sites, which was further confirmed by co-immunoprecipitation of uPA with focal adhesion kinase (FAK) in response to CT. These results suggest that CT increases invasiveness of PC cells by stimulating PKA-mediated uPA secretion and by redirecting the secreted uPA to focal adhesion sites. The results also suggest that uPA may, at least in part, mediate proinvasive actions of CT on PC cells by stimulating the secretion of gelatinases and degradation of focal adhesion sites." @default.
• W2065850453 created "2016-06-24" @default.
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• W2065850453 date "2006-01-01" @default.
• W2065850453 modified "2023-09-23" @default.
• W2065850453 title "Calcitonin stimulates the secretion of urokinase-type plasminogen activator from prostate cancer cells: Its possible implications on tumor cell invasion" @default.
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• W2065850453 doi "https://doi.org/10.1002/ijc.21625" @default.
• W2065850453 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16381004" @default.
• W2065850453 hasPublicationYear "2006" @default.
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