2. Academic Validation
  3. Interactions between BRD4S, LOXL2, and MED1 drive cell cycle transcription in triple-negative breast cancer

Interactions between BRD4S, LOXL2, and MED1 drive cell cycle transcription in triple-negative breast cancer

  • EMBO Mol Med. 2023 Nov 8:e18459. doi: 10.15252/emmm.202318459.
Laura Pascual-Reguant 1,  Queralt Serra-Camprubí 2,  Debayan Datta 1,  Damiano Cianferoni 1,  Savvas Kourtis 1,  Antoni Gañez-Zapater 1,  Chiara Cannatá 1,  Lorena Espinar 1,  Jessica Querol 2,  Laura García-López 1,  Sara Musa-Afaneh 1,  Maria Guirola 1,  Anestis Gkanogiannis 1,  Andrea Miró Canturri 2 3,  Marta Guzman 2,  Olga Rodríguez 2,  Andrea Herencia-Ropero 2,  Joaquin Arribas 2 3 4 5 6,  Violeta Serra 2,  Luis Serrano 1,  Tian V Tian 2,  Sandra Peiró 2,  Sara Sdelci 1
Affiliations

Affiliations

  • 1 Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.
  • 2 Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain.
  • 3 IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain.
  • 4 Centro de Investigación Biomédica en Red de Cáncer, Monforte de Lemos, Madrid, Spain.
  • 5 Department of Biochemistry and Molecular Biology, Universitat Autónoma de Barcelona, Bellaterra, Spain.
  • 6 Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain.
PMID: 37937685 DOI: 10.15252/emmm.202318459
Abstract

Triple-negative breast Cancer (TNBC) often develops resistance to single-agent treatment, which can be circumvented using targeted combinatorial approaches. Here, we demonstrate that the simultaneous inhibition of LOXL2 and BRD4 synergistically limits TNBC proliferation in vitro and in vivo. Mechanistically, LOXL2 interacts in the nucleus with the short isoform of BRD4 (BRD4S), MED1, and the cell cycle transcriptional regulator B-MyB. These interactions sustain the formation of BRD4 and MED1 nuclear transcriptional foci and control cell cycle progression at the gene expression level. The pharmacological co-inhibition of LOXL2 and BRD4 reduces BRD4 nuclear foci, BRD4-MED1 colocalization, and the transcription of cell cycle genes, thus suppressing TNBC cell proliferation. Targeting the interaction between BRD4S and LOXL2 could be a starting point for the development of new Anticancer strategies for the treatment of TNBC.

Keywords

cell cycle; combinatorial therapy; gene expression; triple-negative breast cancer.

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