Platelet-derived growth factor D is activated by urokinase plasminogen activator in prostate carcinoma cells.
Platelet-derived growth factor (PDGF) protein family members are potent mitogens and chemoattractants for mesenchymal cells. The classic PDGF ligands A and B are single-domain protein chains which are secreted as active dimers capable of activating their cognate PDGF receptors (PDGFRs). In contrast to PDGFs A and B, PDGF D contains an N-terminal complement subcomponent C1r/C1s, Uegf, and Bmp1 (CUB) domain and a C-terminal PDGF domain. PDGF D must undergo extracellular proteolytic processing, separating the CUB domain from the PDGF domain, before the PDGF domain can stimulate beta-PDGFR-mediated cell signal transduction. Here, we report that prostate carcinoma cells LNCaP and PC3 autoactivate latent full-length PDGF D into its active form under serum-independent conditions and that this autoactivation is inhibited by PAI-1, a urokinase plasminogen activator (uPA)/tissue plasminogen activator (tPA) inhibitor. Interestingly, uPA, but not the closely related protease tPA, is capable of processing recombinant latent PDGF DD into the active form. We identify the uPA cleavage site between the CUB and PDGF domains of the full-length PDGF D by mutational analysis and show that PDGF D and uPA colocalize in human prostate carcinoma. This evidence provides a direct link between uPA- and PDGF D-mediated cell signaling, which may contribute to the progression of prostate cancer.
Ustach
Carolyn V
CV
Department of Pathology, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, 540 E. Canfield, Detroit, Michigan 48201, USA.
Kim
Hyeong-Reh Choi
HR
D000595:Amino Acid Sequence; D007611:Aprotinin / Q000494:pharmacology; D002277:Carcinoma / Q000737:chemistry / Q000201:enzymology*; D045744:Cell Line, Tumor; D004252:DNA Mutational Analysis; D006801:Humans; D008222:Lymphokines / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008969:Molecular Sequence Data; D017395:Plasminogen Activator Inhibitor 1 / Q000494:pharmacology; D010982:Platelet-Derived Growth Factor / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D011471:Prostatic Neoplasms / Q000737:chemistry / Q000201:enzymology*; D014568:Urokinase-Type Plasminogen Activator / Q000032:analysis / Q000037:antagonists & inhibitors / Q000378:metabolism*
D008222:Lymphokines; C427493:PDGFD protein, human; D017395:Plasminogen Activator Inhibitor 1; D010982:Platelet-Derived Growth Factor; D007611:Aprotinin; D014568:Urokinase-Type Plasminogen Activator