title: The HDAC inhibitor Givinostat modulates the hematopoietic transcription factors NFE2 and C-MYB in JAK2(V617F) myeloproliferative neoplasm cells.
abstract: We investigated the mechanism of action of the histone deacetylase inhibitor Givinostat (GVS) in Janus kinase 2 (JAK2)(V617F) myeloproliferative neoplasm (MPN) cells. GVS inhibited colony formation and proliferation and induced apoptosis at doses two- to threefold lower in a panel of JAK2(V617F) MPN compared to JAK2 wild-type myeloid leukemia cell lines. By global gene expression analysis, we observed that at 6 hours, GVS modulated 293 common genes in the JAK2(V617F) cell lines HEL and UKE1, of which 19 are implicated in cell cycle regulation and 33 in hematopoiesis. In particular, the hematopoietic transcription factors NFE2 and C-MYB were downmodulated by the drug specifically in JAK2(V617F) cells at both the RNA and protein level. GVS also inhibited JAK2-signal transducer and activator of transcription 5-extracellular signal-regulated kinase 1/2 phosphorylation, but modulation of NFE2 and C-MYB was JAK2-independent, as shown using the JAK2 inhibitor TG101209. GVS had a direct effect on the NFE2 promoters, as demonstrated by specific enrichment of associated histone H3 acetylated at lysine 9. Modulation by GVS of NFE2 was also observed in freshly isolated CD34(+) cells from MPN patients, and was accompanied by inhibition of their proliferation and differentiation toward the erythroid lineage. We conclude that GVS acts on MPN cells through dual JAK2-signal transducer and activator of transcription 5-extracellular signal-regulated kinase 1/2 inhibition and downmodulation of NFE2 and C-MYB transcription.
authors.affiliation: USC Hematology, Ospedali Riuniti, Bergamo, Italy.
authors.forename: Ariel
authors.initials: A
authors.lastname: Amaru Calzada
authors.forename: Katia
authors.initials: K
authors.lastname: Todoerti
authors.forename: Luca
authors.initials: L
authors.lastname: Donadoni
authors.forename: Anna
authors.initials: A
authors.lastname: Pellicioli
authors.forename: Giacomo
authors.initials: G
authors.lastname: Tuana
authors.forename: Raffaella
authors.initials: R
authors.lastname: Gatta
authors.forename: Antonino
authors.initials: A
authors.lastname: Neri
authors.forename: Guido
authors.initials: G
authors.lastname: Finazzi
authors.forename: Roberto
authors.initials: R
authors.lastname: Mantovani
authors.forename: Alessandro
authors.initials: A
authors.lastname: Rambaldi
authors.forename: Martino
authors.initials: M
authors.lastname: Introna
authors.forename: Luigia
authors.initials: L
authors.lastname: Lombardi
authors.forename: Josée
authors.initials: J
authors.lastname: Golay
mesh_terms: D002219:Carbamates / Q000494:pharmacology*; D045744:Cell Line, Tumor; D015536:Down-Regulation / Q000187:drug effects; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors / Q000494:pharmacology*; D006801:Humans; D053614:Janus Kinase 2 / Q000235:genetics / Q000502:physiology*; D009154:Mutation; D009196:Myeloproliferative Disorders / Q000188:drug therapy*; D050984:NF-E2 Transcription Factor, p45 Subunit / Q000235:genetics*; D010766:Phosphorylation; D020598:Proto-Oncogene Proteins c-myb / Q000235:genetics*; D011743:Pyrimidines / Q000494:pharmacology; D015398:Signal Transduction; D013449:Sulfonamides / Q000494:pharmacology; D000096926:Benzenesulfonamides
chemical_list: D002219:Carbamates; D056572:Histone Deacetylase Inhibitors; D053614:Janus Kinase 2; D050984:NF-E2 Transcription Factor, p45 Subunit; D020598:Proto-Oncogene Proteins c-myb; D011743:Pyrimidines; D013449:Sulfonamides; C494692:NFE2 protein, human; C522865:TG101209; D000096926:Benzenesulfonamides; C575255:givinostat; C507924:JAK2 protein, human