title: BET and HDAC inhibitors induce similar genes and biological effects and synergize to kill in Myc-induced murine lymphoma.
abstract: The bromodomain and extraterminal (BET) domain family of proteins binds to acetylated lysines on histones and regulates gene transcription. Recently, BET inhibitors (BETi) have been developed that show promise as potent anticancer drugs against various solid and hematological malignancies. Here we show that the structurally novel and orally bioavailable BET inhibitor RVX2135 inhibits proliferation and induces apoptosis of lymphoma cells arising in Myc-transgenic mice in vitro and in vivo. We find that BET inhibition exhibits broad transcriptional effects in Myc-transgenic lymphoma cells affecting many transcription factor networks. By examining the genes induced by BETi, which have largely been ignored to date, we discovered that these were similar to those induced by histone deacetylase inhibitors (HDACi). HDACi also induced cell-cycle arrest and cell death of Myc-induced murine lymphoma cells and synergized with BETi. Our data suggest that BETi sensitize Myc-overexpressing lymphoma cells partly by inducing HDAC-silenced genes, and suggest synergistic and therapeutic combinations by targeting the genetic link between BETi and HDACi.
authors: Department of Surgery, Sahlgrenska Cancer Center, Institute of Clinical Sciences, University of Gothenburg, 41390 Gothenburg, Sweden;
authors: Joydeep
authors: J
authors: Bhadury
authors: Department of Surgery, Sahlgrenska Cancer Center, Institute of Clinical Sciences, University of Gothenburg, 41390 Gothenburg, Sweden;
authors: Lisa M
authors: LM
authors: Nilsson
authors: Department of Surgery, Sahlgrenska Cancer Center, Institute of Clinical Sciences, University of Gothenburg, 41390 Gothenburg, Sweden;
authors: Somsundar Veppil
authors: SV
authors: Muralidharan
authors: Department of Surgery, Sahlgrenska Cancer Center, Institute of Clinical Sciences, University of Gothenburg, 41390 Gothenburg, Sweden;
authors: Lydia C
authors: LC
authors: Green
authors: III Medical Department, Technische Universität München, 81675 Munich, Germany; and.
authors: Zhoulei
authors: Z
authors: Li
authors: Zenith Epigenetics Corp., Calgary, AB, Canada T2L 2K7.
authors: Emily M
authors: EM
authors: Gesner
authors: Zenith Epigenetics Corp., Calgary, AB, Canada T2L 2K7.
authors: Henrik C
authors: HC
authors: Hansen
authors: III Medical Department, Technische Universität München, 81675 Munich, Germany; and.
authors: Ulrich B
authors: UB
authors: Keller
authors: Zenith Epigenetics Corp., Calgary, AB, Canada T2L 2K7.
authors: Kevin G
authors: KG
authors: McLure
authors: Department of Surgery, Sahlgrenska Cancer Center, Institute of Clinical Sciences, University of Gothenburg, 41390 Gothenburg, Sweden; jonas.a.nilsson@surgery.gu.se.
authors: Jonas A
authors: JA
authors: Nilsson
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D004357:Drug Synergism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D056572:Histone Deacetylase Inhibitors / Q000494:pharmacology*; D008223:Lymphoma; D051379:Mice; D008822:Mice, Transgenic; D009419:Nerve Tissue Proteins / Q000037:antagonists & inhibitors*; D052999:Quinazolinones / Q000494:pharmacology*; D011956:Receptors, Cell Surface / Q000037:antagonists & inhibitors*; D014157:Transcription Factors / Q000378:metabolism
chemical_list: C486765:Dner protein, mouse; D056572:Histone Deacetylase Inhibitors; D009419:Nerve Tissue Proteins; D052999:Quinazolinones; D011956:Receptors, Cell Surface; D014157:Transcription Factors
keywords: Brd2; Brd4; JQ1; mouse models; vorinostat