2026-04-17T01:08:00Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/622252025-12-05T09:21:46Zcom_2072_1057col_2072_478799col_2072_478861col_2072_478916col_2072_478917col_2072_478929

00925njm 22002777a 4500 dc Gomà, Alba author Mir Cantos, Roser author Martínez Soler, Fina author Tortosa i Moreno, Avelina author Vidal-Bel, August author Condom i Mundó, Enric author Pérez Tomás, Ricardo E. author Giménez Bonafé, Pepita author 2015-02-02T12:33:43Z 2015-02-02T12:33:43Z 2014-12-05 2015-02-02T12:33:43Z Background: One of the problems in prostate cancer (CaP) treatment is the appearance of the multidrug resistance phenotype, in which ATP-binding cassette transporters such as multidrug resistance protein 1 (MRP1) play a role. Different localizations of the transporter have been reported, some of them related to the chemoresistant phenotype. Aim: This study aimed to compare the localization of MRP1 in three prostate cell lines (normal, androgen-sensitive, and androgen-independent) in order to understand its possible role in CaP chemoresistance. Methods: MRP1 and caveolae protein markers were detected using confocal microscopy, performing colocalization techniques. Lipid raft isolation made it possible to detect these proteins by Western blot analysis. Caveolae and prostasomes were identified by electron microscopy. Results: We show that MRP1 is found in lipid raft fractions of tumor cells and that the number of caveolae increases with malignancy acquisition. MRP1 is found not only in the plasma membrane associated with lipid rafts but also in cytoplasmic accumulations colocalizing with the prostasome markers Caveolin-1 and CD59, suggesting that in CaP cells, MRP1 is localized in prostasomes. Conclusion: We hypothesize that the presence of MRP1 in prostasomes could serve as a reservoir of MRP1; thus, taking advantage of the release of their content, MRP1 could be translocated to the plasma membrane contributing to the chemoresistant phenotype. The presence of MRP1 in prostasomes could serve as a predictor of malignancy in CaP Càncer de pròstata Resistència als medicaments Prostate cancer Drug resistance Multidrug resistance protein 1 localization in lipid raft domains and prostasomes in prostate cancer cell lines