title: The BH3-only mimetic ABT-737 synergizes the antineoplastic activity of proteasome inhibitors in lymphoid malignancies.
abstract: Overexpression of antiapoptotic members of the Bcl-2 family is observed in approximately 80% of B-cell lymphomas, contributing to intrinsic and acquired drug resistance. Nullifying the antiapoptotic influence of these proteins can potentially overcome this resistance, and may complement conventional chemotherapy. ABT-737 is a BH3-only mimetic and potent inhibitor of the antiapoptotic Bcl-2 family members Bcl-2, Bcl-X(L), and Bcl-w. In vitro, ABT-737 exhibited concentration-dependent cytotoxicity against a broad panel of lymphoma cell lines including mantle cell lymphoma (MCL) and diffuse large B-cell lymphoma (DLBCL). ABT-737 showed synergism when combined with the proteasome inhibitors bortezomib or carfilzomib in select lymphoma cell lines and induced potent mitochondrial membrane depolarization and apoptosis when combined with either. ABT-737 plus bortezomib also induced significant apoptosis in primary samples of MCL, DLBCL, and chronic lymphocytic leukemia (CLL) but no significant cytotoxic effect was observed in peripheral blood mononuclear cells from healthy donors. In severe combined immunodeficient beige mouse models of MCL, the addition of ABT-737 to bortezomib enhanced efficacy compared with either drug alone and with the control. Collectively, these data suggest that ABT-737 alone or in combination with a proteasome inhibitor represents a novel and potentially important platform for the treatment of B-cell malignancies.
authors.affiliation: Herbert Irving Comprehensive Cancer Center, Columbia University, New York, NY, USA.
authors.forename: Luca
authors.initials: L
authors.lastname: Paoluzzi
authors.forename: Mithat
authors.initials: M
authors.lastname: Gonen
authors.forename: Govind
authors.initials: G
authors.lastname: Bhagat
authors.forename: Richard R
authors.initials: RR
authors.lastname: Furman
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Gardner
authors.forename: Luigi
authors.initials: L
authors.lastname: Scotto
authors.forename: Volodia D
authors.initials: VD
authors.lastname: Gueorguiev
authors.forename: Mark L
authors.initials: ML
authors.lastname: Heaney
authors.forename: Katia
authors.initials: K
authors.lastname: Manova
authors.forename: Owen A
authors.initials: OA
authors.lastname: O'Connor
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000494:pharmacology*; D001897:Boronic Acids / Q000494:pharmacology; D000069286:Bortezomib; D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D019008:Drug Resistance, Neoplasm / Q000187:drug effects; D004357:Drug Synergism; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006262:Health; D006801:Humans; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000473:pathology; D007963:Leukocytes, Mononuclear / Q000187:drug effects; D008223:Lymphoma / Q000201:enzymology* / Q000473:pathology*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000473:pathology; D020522:Lymphoma, Mantle-Cell / Q000473:pathology; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D051379:Mice; D018613:Microscopy, Confocal; D018716:Molecular Mimicry / Q000187:drug effects*; D009596:Nitrophenols / Q000494:pharmacology*; D010879:Piperazines / Q000494:pharmacology; D061988:Proteasome Inhibitors; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D011719:Pyrazines / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology*; D014019:Tissue Donors; D023041:Xenograft Model Antitumor Assays
chemical_list: C501332:ABT-737; D000970:Antineoplastic Agents; D001713:Biphenyl Compounds; D001897:Boronic Acids; D004791:Enzyme Inhibitors; D009596:Nitrophenols; D010879:Piperazines; D061988:Proteasome Inhibitors; D019253:Proto-Oncogene Proteins c-bcl-2; D011719:Pyrazines; D013449:Sulfonamides; D000069286:Bortezomib