2026-09-18T01:25:48Zhttps://gredos.usal.es/oai/request

oai:gredos.usal.es:10366/1552922025-04-30T19:33:37Zcom_10366_3992com_10366_3947com_10366_3946com_10366_3823col_10366_3993

Lozano Esteban, Elisa Rodríguez Macías, Rocío Isabel Monte Río, María Jesús Asensio Martín, Maitane Carmen Martínez, Sofía del Sánchez Vicente, Laura Alonso Peña, Marta Al Abdulla, Ruba Munoz-Garrido, Patricia Satriano, Letizia O'Rourke, Colm J Banales, Jesus M. Avila, Matias A. Martínez-Chantar, María L. Andersen, Jesper B Briz Sánchez, Oscar García Marín, José Juan 2024-02-05T09:32:23Z 2024-02-05T09:32:23Z 2019-10 http://hdl.handle.net/10366/155292 10.1002/hep.30656 30972782 1527-3350 Although the multi-tyrosine kinase inhibitor sorafenib is useful in the treatment of several cancers, cholangiocarcinoma (CCA) is refractory to this drug. Among other mechanisms of chemoresistance, impaired uptake through human organic cation transporter type 1 (hOCT1) (gene SLC22A1) has been suggested. Here we have investigated the events accounting for this phenotypic characteristic and have evaluated the interest of selective gene therapy strategies to overcome this limitation. Gene expression and DNA methylation of SLC22A1 were analyzed using intrahepatic (iCCA) and extrahepatic (eCCA) biopsies (Copenhagen and Salamanca cohorts; n = 132) and The Cancer Genome Atlas (TCGA)-CHOL (n = 36). Decreased hOCT1 mRNA correlated with hypermethylation status of the SLC22A1 promoter. Treatment of CCA cells with decitabine (demethylating agent) or butyrate (histone deacetylase inhibitor) restored hOCT1 expression and increased sorafenib uptake. MicroRNAs able to induce hOCT1 mRNA decay were analyzed in paired samples of TCGA-CHOL (n = 9) and Copenhagen (n = 57) cohorts. Consistent up-regulation in tumor tissue was found for miR-141 and miR-330. High proportion of aberrant hOCT1 mRNA splicing in CCA was also seen. Lentiviral-mediated transduction of eCCA (EGI-1 and TFK-1) and iCCA (HuCCT1) cells with hOCT1 enhanced sorafenib uptake and cytotoxic effects. In chemically induced CCA in rats, reduced rOct1 expression was accompanied by impaired sorafenib uptake. In xenograft models of eCCA cells implanted in mouse liver, poor response to sorafenib was observed. However, tumor growth was markedly reduced by cotreatment with sorafenib and adenoviral vectors encoding hOCT1 under the control of the BIRC5 promoter, a gene highly up-regulated in CCA. Conclusion: The reason for impaired hOCT1-mediated sorafenib uptake by CCA is multifactorial. Gene therapy capable of selectively inducing hOCT1 in tumor cells can be considered a potentially useful chemosensitization strategy to improve the response of CCA to sorafenib. Ministry of Science and Innovation Asociación Española Contra el Cancer application/pdf eng Chemoresistance Cholangiocarcinoma Pharmacological treatment Octamer Transcription Factor-1 Cholangiocarcinoma DNA Methylation Immunoblotting Humans Cell Line Statistics Protein Kinase Inhibitors Real-Time Polymerase Chain Reaction Bile Duct Neoplasms Drug Resistance RNA Down-Regulation Genetic Therapy Random Allocation Rats Animals 3209 Farmacología inhibidores de proteína cinasas humanos línea celular metilación del ADN ARN distribución aleatoria terapia genética regulación negativa inmunotransferencia neoplasias de los conductos biliares animales factor 1 de transcripción de octámeros estadísticas resistencia a medicamentos ratas colangiocarcinoma reacción en cadena de la polimerasa en tiempo real Causes of hOCT1-Dependent Cholangiocarcinoma Resistance to Sorafenib and Sensitization by Tumor-Selective Gene Therapy info:eu-repo/semantics/article info:eu-repo/semantics/draft SAF2016-75197-R AECC-2017 info:eu-repo/semantics/openAccess Hepatology (Baltimore, Md.) 70 4 1246 1261