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• W2145133052 abstract "Factors responsible for invasive and metastatic progression of prostate cancer (PCa) remain largely unknown. Previously, we reported cloning of prosaposin (PSAP) and its genomic amplification and/or overexpression in several androgen-independent metastatic PCa cell lines and lymph node metastases. PSAP is the lysosomal precursor of saposins, which serve as activators for lysosomal hydrolases involved in the degradation of ceramide (Cer) and other sphingolipids.Our current data show that, in metastatic PCa cells, stable down-modulation of PSAP by RNA-interference via a lysosomal proteolysis-dependent pathway decreased beta1A-integrin expression, its cell-surface clustering, and adhesion to basement membrane proteins; led to disassembly of focal adhesion complex; and decreased phosphorylative activity of focal adhesion kinase and its downstream adaptor molecule, paxillin. Cathepsin D (CathD) expression and proteolytic activity, migration, and invasion were also significantly decreased in PSAP knock-down cells. Transient-transfection studies with beta1A integrin- or CathD-siRNA oligos confirmed the cause and effect relationship between PSAP and CathD or PSAP and Cer-beta1A integrin, regulating PCa cell migration and invasion.Our findings suggest that by a coordinated regulation of Cer levels, CathD and beta1A-integrin expression, and attenuation of inside-out integrin-signaling pathway, PSAP is involved in PCa invasion and therefore might be used as a molecular target for PCa therapy." @default.
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• W2145133052 date "2010-02-04" @default.
• W2145133052 modified "2023-10-15" @default.
• W2145133052 title "Prosaposin down-modulation decreases metastatic prostate cancer cell adhesion, migration, and invasion" @default.
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• W2145133052 doi "https://doi.org/10.1186/1476-4598-9-30" @default.
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