title: MS-27-275, an inhibitor of histone deacetylase, has marked in vitro and in vivo antitumor activity against pediatric solid tumors.
abstract: The antitumor efficacy of the synthetic benzamide derivative MS-27-275 (MS-275), an inhibitor of histone deacetylation [T. Suzuki et al., J. Med. Chem., 42: 3001-3003, 1999], was evaluated in a series of pediatric solid tumor cell lines, including neuroblastoma, rhabdomyosarcoma, Ewing's sarcoma (EWS), retinoblastoma, medulloblastoma, undifferentiated sarcoma (US), osteosarcoma, and malignant rhabdoid tumors. Treatment with MS-275 results in an increase in acetylation of histones within 4 h of drug exposure. The cell lines were treated with various concentrations of MS-275 for 3 days and incubated with [(3)H]thymidine for 20 h before cell harvest. MS-275 inhibited [(3)H]thymidine uptake in a dose-dependent manner in all tumor cell lines examined. The IC(50) ranged from 50 nm in the D283 medulloblastoma cell line to 1.3 micro M in the US. A common feature of MS-275 treatment of pediatric tumor cell lines was induction of p21mRNA. However, the effects on cell cycle were diverse because in some cases MS-275 induced an increase in G(1) or G(2), whereas in others, there was an induction of apoptosis. In EWS, the EWS/fli chimeric transcription factor created by the t(11;22) suppresses transforming growth factor (TGF) betaRII transcription, however, MS-275 was able to induce an increase in TGF-betaRII mRNA and restore TGF-beta signaling. Using xenograft orthotopic models of US, EWS, and neuroblastoma, we find that the growth of established tumors is inhibited in mice treated with MS-275.
authors.affiliation: Cell and Molecular Biology Section, Pediatric Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA.
authors.forename: Jerry
authors.initials: J
authors.lastname: Jaboin
authors.forename: Jason
authors.initials: J
authors.lastname: Wild
authors.forename: Habib
authors.initials: H
authors.lastname: Hamidi
authors.forename: Chand
authors.initials: C
authors.lastname: Khanna
authors.forename: Chong Jai
authors.initials: CJ
authors.lastname: Kim
authors.forename: Robert
authors.initials: R
authors.lastname: Robey
authors.forename: Susan E
authors.initials: SE
authors.lastname: Bates
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Thiele
mesh_terms: D000107:Acetylation / Q000187:drug effects; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001549:Benzamides / Q000494:pharmacology*; D002453:Cell Cycle / Q000187:drug effects; D002648:Child; D004273:DNA, Neoplasm / Q000096:biosynthesis; D004305:Dose-Response Relationship, Drug; D004354:Drug Screening Assays, Antitumor; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D056572:Histone Deacetylase Inhibitors; D006657:Histones / Q000378:metabolism; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D016513:Mice, SCID; D011725:Pyridines / Q000494:pharmacology*; D014407:Tumor Cells, Cultured; D023041:Xenograft Model Antitumor Assays
chemical_list: D000970:Antineoplastic Agents; D001549:Benzamides; D004273:DNA, Neoplasm; D004791:Enzyme Inhibitors; D056572:Histone Deacetylase Inhibitors; D006657:Histones; D011725:Pyridines; C118739:entinostat