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López-Cánovas JL, Del Rio-Moreno M, García-Fernandez H, Jiménez-Vacas JM, Moreno-Montilla MT, Sánchez-Frias ME, Amado V, L-López F, Fondevila MF, Ciria R, Gómez-Luque I, Briceño J, Nogueiras R, de la Mata M, Castaño JP, Rodriguez-Perálvarez M, Luque RM, Gahete MD. Splicing factor SF3B1 is overexpressed and implicated in the aggressiveness and survival of hepatocellular carcinoma. Cancer Lett 2021; 496:72-83. [PMID: 33038489 DOI: 10.1016/j.canlet.2020.10.010] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/01/2020] [Accepted: 10/02/2020] [Indexed: 12/19/2022]
Abstract
Splicing alterations represent an actionable cancer hallmark. Splicing factor 3B subunit 1 (SF3B1) is a crucial splicing factor that can be targeted pharmacologically (e.g. pladienolide-B). Here, we show that SF3B1 is overexpressed (RNA/protein) in hepatocellular carcinoma (HCC) in two retrospective (n = 154 and n = 172 samples) and in five in silico cohorts (n > 900 samples, including TCGA) and that its expression is associated with tumor aggressiveness, oncogenic splicing variants expression (KLF6-SV1, BCL-XL) and decreased overall survival. In vitro, SF3B1 silencing reduced cell viability, proliferation and migration and its pharmacological blockade with pladienolide-B inhibited proliferation, migration, and formation of tumorspheres and colonies in liver cancer cell lines (HepG2, Hep3B, SNU-387), whereas its effects on normal-like hepatocyte-derived THLE-2 proliferation were negligible. Pladienolide-B also reduced the in vivo growth and the expression of tumor-markers in Hep3B-induced xenograft tumors. Moreover, SF3B1 silencing and/or blockade markedly modulated the activation of key signaling pathways (PDK1, GSK3b, ERK, JNK, AMPK) and the expression of cancer-associated genes (CDK4, CD24) and oncogenic SVs (KLF6-SV1). Therefore, the genetic and/or pharmacological inhibition of SF3B1 may represent a promising novel therapeutic strategy worth to be explored through randomized controlled trials.
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Affiliation(s)
- Juan L López-Cánovas
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Mercedes Del Rio-Moreno
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Helena García-Fernandez
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Juan M Jiménez-Vacas
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - M Trinidad Moreno-Montilla
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Marina E Sánchez-Frias
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain
| | - Víctor Amado
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Hepatology and Liver Transplantation, Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Hepatic and Digestive Diseases (CIBERehd), Córdoba, 14004, Spain
| | - Fernando L-López
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Marcos F Fondevila
- CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain; Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain
| | - Rubén Ciria
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Unit of Hepatobiliary Surgery and Liver Transplantation, Reina Sofía University Hospital, Cordoba, 14004, Spain
| | - Irene Gómez-Luque
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Unit of Hepatobiliary Surgery and Liver Transplantation, Reina Sofía University Hospital, Cordoba, 14004, Spain
| | - Javier Briceño
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Unit of Hepatobiliary Surgery and Liver Transplantation, Reina Sofía University Hospital, Cordoba, 14004, Spain
| | - Rubén Nogueiras
- CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain; Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain
| | - Manuel de la Mata
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Hepatology and Liver Transplantation, Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Hepatic and Digestive Diseases (CIBERehd), Córdoba, 14004, Spain
| | - Justo P Castaño
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Manuel Rodriguez-Perálvarez
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Hepatology and Liver Transplantation, Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Hepatic and Digestive Diseases (CIBERehd), Córdoba, 14004, Spain
| | - Raúl M Luque
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain
| | - Manuel D Gahete
- Maimónides Institute of Biomedical Research of Córdoba (IMIBIC), Córdoba, 14004, Spain; Department of Cell Biology, Physiology and Immunology, University of Córdoba, Córdoba, 14004, Spain; Reina Sofía University Hospital, Córdoba, 14004, Spain; CIBER Pathophysiology of Obesity and Nutrition (CIBERobn), Córdoba, 14004, Spain.
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