E2F1 and E2F2-mediated repression of CPT2 establishes a lipid-rich tumor-promoting environment

Research output: Contribution to journalJournal articleResearchpeer-review

  • Francisco Gonzalez-Romero
  • Daniela Mestre
  • Igor Aurrekoetxea
  • Ashwin Woodhoo
  • Miguel Tamayo-Caro
  • Marta Varela-Rey
  • Marta Palomo-Irigoyen
  • Beatriz Gomez-Santos
  • Diego Saenz de Urturi
  • Maitane Nuñez-García
  • Juan L. García-Rodríguez
  • Larraitz Fernandez-Ares
  • Xabier Buque
  • Ainhoa Iglesias-Ara
  • Irantzu Bernales
  • Virginia Gutierrez de Juan
  • Teresa C. Delgado
  • Naroa Goikoetxea-Usandizaga
  • Richard Lee
  • Sanjay Bhanot
  • Igotz Delgado
  • Maria J. Perugorria
  • Gaizka Errazti
  • Lorena Mosteiro
  • Sonia Gaztambide
  • Idoia Martinez de la Piscina
  • Paula Iruzubieta
  • Javier Crespo
  • Jesus M. Banales
  • Maria L. Martínez-Chantar
  • Luis Castaño
  • Ana M. Zubiaga
  • Patricia Aspichueta

Lipid metabolism rearrangements in nonalcoholic fatty liver disease (NAFLD) contribute to disease progression. NAFLD has emerged as a major risk for hepatocellular carcinoma (HCC), where metabolic reprogramming is a hallmark. Identification of metabolic drivers might reveal therapeutic targets to improve HCC treatment. Here, we investigated the contribution of transcription factors E2F1 and E2F2 to NAFLD-related HCC and their involvement in metabolic rewiring during disease progression. In mice receiving a high-fat diet (HFD) and diethylnitrosamine (DEN) administration, E2f1 and E2f2 expressions were increased in NAFLD-related HCC. In human NAFLD, E2F1 and E2F2 levels were also increased and positively correlated. E2f1-/- and E2f2-/- mice were resistant to DEN-HFD-induced hepatocarcinogenesis and associated lipid accumulation. Administration of DEN-HFD in E2f1-/- and E2f2-/- mice enhanced fatty acid oxidation (FAO) and increased expression of Cpt2, an enzyme essential for FAO, whose downregulation is linked to NAFLD-related hepatocarcinogenesis. These results were recapitulated following E2f2 knockdown in liver, and overexpression of E2f2 elicited opposing effects. E2F2 binding to the Cpt2 promoter was enhanced in DEN-HFD-administered mouse livers compared with controls, implying a direct role for E2F2 in transcriptional repression. In human HCC, E2F1 and E2F2 expressions inversely correlated with CPT2 expression. Collectively, these results indicate that activation of the E2F1-E2F2-CPT2 axis provides a lipid-rich environment required for hepatocarcinogenesis.

Original languageEnglish
JournalCancer Research
Volume81
Issue number11
Pages (from-to)2874-2887
Number of pages14
ISSN0008-5472
DOIs
Publication statusPublished - 2021

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© 2021 American Association for Cancer Research.

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