ZIP9 but not the androgen receptor mediates testosterone-induced migratory activity of metastatic prostate cancer cells

Publication date: Available online 15 September 2018Source: Biochimica et Biophysica Acta (BBA) - Molecular Cell ResearchAuthor(s): Ahmed Bulldan, Joerg-Walter Bartsch, Lutz Konrad, Georgios Scheiner-BobisAbstractLNCaP cells are derived from a metastatic lesion of human prostate adenocarcinoma. They express the classical androgen receptor (AR) and ZIP9, a Zn2+ transporter that also binds testosterone and mediates signaling by interacting with G-proteins.Our results show that LNCaP cells respond to testosterone by mobilizing their migratory machinery. Their exposure to testosterone triggers the formation of lamellipodia, reorganization of the actin cytoskeleton, phosphorylation of focal adhesion kinase (FAK) at Tyr925 and of paxillin at Tyr118, expression of matrix metalloproteinase 2 (MMP-2), and cell migration.Silencing ZIP9 expression by means of siRNA does not affect the responsiveness of the classical AR to testosterone; however, it prevents all of the testosterone effects described above: formation of lamellipodia cannot be induced, stimulation of FAK or paxillin phosphorylation or MMP-2 expression is prevented, and cell migration does not take place in the absence of ZIP9.The data presented show that testosterone/ZIP9 interactions might have not only physiological but also pathophysiological relevance. The fact that the migratory machinery of a metastatic prostate cancer cell line is activated exclusively through testosterone/ZIP9 and not through testosterone/AR interac...
Source: Biochimica et Biophysica Acta (BBA) Molecular Cell Research - Category: Molecular Biology Source Type: research