title: Epigenetic Activity of Peroxisome Proliferator-Activated Receptor Gamma Agonists Increases the Anticancer Effect of Histone Deacetylase Inhibitors on Multiple Myeloma Cells.
abstract: Epigenetic modifications play a major role in the development of multiple myeloma. We have previously reported that the PPARγ agonist pioglitazone (PIO) enhances, in-vitro, the cytotoxic effect of the Histone deacetylase inhibitor (HDACi), valproic acid (VPA), on multiple myeloma cells. Here, we described the development of a new multiple myeloma mouse model using MOLP8 cells, in order to evaluate the effect of VPA/PIO combination on the progression of myeloma cells, by analyzing the proliferation of bone marrow plasma cells. We showed that VPA/PIO delays the progression of the disease and the invasion of myeloma cells in the bone marrow. Mechanistically, we demonstrated that VPA/PIO increases the cleavage of caspase 3 and PARP, and induces the acetylation of Histone 3 (H3). Furthermore, we provided evidence that PPARγ agonist is able to enhance the action of other HDACi such as Vorinostat or Mocetinostat. Using PPARγ antagonist or siPPARγ, we strongly suggest that, as described during adipogenesis, PIO behaves as an epigenetic regulator by improving the activity of HDACi. This study highlights the therapeutic benefit of PIO/VPA combination, compared to VPA treatment as a single-arm therapy on multiple myeloma and further highlights that such combination may constitute a new promising treatment strategy which should be supported by clinical trials.
authors.affiliation: Laboratory of Experimental Hemato-Oncology, LHCE, Luxembourg Institute of Health (LIH), Strassen, Luxembourg.
authors.forename: Nassera
authors.initials: N
authors.lastname: Aouali
authors.affiliation: Laboratory of Experimental Hemato-Oncology, LHCE, Luxembourg Institute of Health (LIH), Strassen, Luxembourg.
authors.forename: Angeliki
authors.initials: A
authors.lastname: Broukou
authors.affiliation: Laboratory of Experimental Hemato-Oncology, LHCE, Luxembourg Institute of Health (LIH), Strassen, Luxembourg.
authors.forename: Manon
authors.initials: M
authors.lastname: Bosseler
authors.affiliation: Laboratory Neuro-Oncology, Norlux, Luxembourg Institute of Health (LIH), Strassen, Luxembourg.
authors.forename: Olivier
authors.initials: O
authors.lastname: Keunen
authors.affiliation: Laboratory of Hematology, Centre Hospitalier de Luxembourg (CHL), Strassen, Luxembourg.
authors.forename: Vincent
authors.initials: V
authors.lastname: Schlesser
authors.affiliation: Laboratory of Experimental Hemato-Oncology, LHCE, Luxembourg Institute of Health (LIH), Strassen, Luxembourg.
authors.forename: Bassam
authors.initials: B
authors.lastname: Janji
authors.affiliation: Laboratory of Experimental Hemato-Oncology, LHCE, Luxembourg Institute of Health (LIH), Strassen, Luxembourg.
authors.forename: Valerie
authors.initials: V
authors.lastname: Palissot
authors.affiliation: Biotechnology Department, Experimental Infectious Diseases Platform, CER Group, Marloie, Belgium.
authors.forename: Philippe
authors.initials: P
authors.lastname: Stordeur
authors.affiliation: Laboratory of Experimental Hemato-Oncology, LHCE, Luxembourg Institute of Health (LIH), Strassen, Luxembourg; Laboratory of Hematology, Centre Hospitalier de Luxembourg (CHL), Strassen, Luxembourg.
authors.forename: Guy
authors.initials: G
authors.lastname: Berchem
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001549:Benzamides / Q000494:pharmacology*; D002470:Cell Survival; D004357:Drug Synergism; D044127:Epigenesis, Genetic / Q000187:drug effects*; D005260:Female; D056572:Histone Deacetylase Inhibitors / Q000494:pharmacology*; D006877:Hydroxamic Acids / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D009101:Multiple Myeloma / Q000188:drug therapy / Q000235:genetics* / Q000378:metabolism; D047495:PPAR gamma / Q000819:agonists; D011743:Pyrimidines / Q000494:pharmacology*; D000077337:Vorinostat; D023041:Xenograft Model Antitumor Assays
chemical_list: D000970:Antineoplastic Agents; D001549:Benzamides; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D047495:PPAR gamma; D011743:Pyrimidines; D000077337:Vorinostat; C523184:mocetinostat