1. PXR Modulates the Prostate Cancer Cell Response to Afatinib by Regulating the Expression of the Monocarboxylate Transporter SLC16A1
- Author
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Hanane Agherbi, Fanny Leenhardt, Litaty Mbatchi, Aurélie Garcin, Philippe Pourquier, Alexandre Evrard, Candice Marchive, Alice Matheux, Matthieu Gassiot, Nadine Houede, Abdelhay Boulahtouf, Gaëlle Fromont, Patrick Balaguer, Eve Combes, Céline Gongora, Eric Fabbrizio, Institut de Recherche en Cancérologie de Montpellier (IRCM - U1194 Inserm - UM), CRLCC Val d'Aurelle - Paul Lamarque-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Gongora, Céline, Centre Hospitalier Universitaire de Nîmes (CHU Nîmes), Institut du Cancer de Montpellier (ICM), Nutrition, croissance et cancer (U 1069) (N2C), Université de Tours (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), and Institut de Cancérologie du GARD ICG - CHU Nîmes (Instit Cancéro - GARD)
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0301 basic medicine ,Cancer Research ,Afatinib ,PXR ,[SDV]Life Sciences [q-bio] ,afatinib ,[SDV.CAN]Life Sciences [q-bio]/Cancer ,[SDV.MHEP.UN]Life Sciences [q-bio]/Human health and pathology/Urology and Nephrology ,digestive system ,Article ,03 medical and health sciences ,Prostate cancer ,0302 clinical medicine ,[SDV.CAN] Life Sciences [q-bio]/Cancer ,Prostate ,medicine ,kinase inhibitors ,RC254-282 ,Pregnane X receptor ,Chemistry ,Kinase ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,biomarkers ,Dabrafenib ,medicine.disease ,prostate cancer ,[SDV.MHEP.UN] Life Sciences [q-bio]/Human health and pathology/Urology and Nephrology ,digestive system diseases ,3. Good health ,Dasatinib ,030104 developmental biology ,medicine.anatomical_structure ,Oncology ,[SDV.SP.PHARMA] Life Sciences [q-bio]/Pharmaceutical sciences/Pharmacology ,030220 oncology & carcinogenesis ,[SDV.SP.PHARMA]Life Sciences [q-bio]/Pharmaceutical sciences/Pharmacology ,Cancer research ,SLC16A1 ,Erlotinib ,Biomakers ,medicine.drug - Abstract
Simple Summary Many kinase inhibitors have been tested as potential alternatives for the treatment of castration-resistant prostate cancers. However, none of these clinical trials led to drug approval despite interesting responses. Our study reveals that genes involved in drug metabolism and their master regulator PXR (Pregnane X Receptor) could be responsible, at least in part, for these disappointing results as they can modulate tumor cell response to specific kinase inhibitors. We found that stable expression of PXR sensitized prostate cancer cells to erlotinib, dabrafenib, and afatinib, while it rendered cells resistant to dasatinib and had no effect for other inhibitors tested. We also report for the first time that sensitization to afatinib is due to an alteration in drug transport that involves the SLC16A1 monocarboxylate transporter. Together, our results further indicate that PXR might be considered as a biomarker of response to kinase inhibitors in castration-resistant prostate cancers. Abstract Resistance to castration is a crucial issue in the treatment of metastatic prostate cancer. Kinase inhibitors (KIs) have been tested as potential alternatives, but none of them are approved yet. KIs are subject of extensive metabolism at both the hepatic and the tumor level. Here, we studied the role of PXR (Pregnane X Receptor), a master regulator of metabolism, in the resistance to KIs in a prostate cancer setting. We confirmed that PXR is expressed in prostate tumors and is more frequently detected in advanced forms of the disease. We showed that stable expression of PXR in 22Rv1 prostate cancer cells conferred a resistance to dasatinib and a higher sensitivity to erlotinib, dabrafenib, and afatinib. Higher sensitivity to afatinib was due to a ~ 2-fold increase in its intracellular accumulation and involved the SLC16A1 transporter as its pharmacological inhibition by BAY-8002 suppressed sensitization of 22Rv1 cells to afatinib and was accompanied with reduced intracellular concentration of the drug. We found that PXR could bind to the SLC16A1 promoter and induced its transcription in the presence of PXR agonists. Together, our results suggest that PXR could be a biomarker of response to kinase inhibitors in castration-resistant prostate cancers.
- Published
- 2021
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