The checkpoint kinase inhibitor AZD7762 potentiates chemotherapy-induced apoptosis of p53-mutated multiple myeloma cells.
DNA cross-linking agents are frequently used in the treatment of multiple myeloma-generating lesions, which activate checkpoint kinase 1 (Chk1), a critical transducer of the DNA damage response. Chk1 activation promotes cell survival by regulating cell-cycle arrest and DNA repair following genotoxic stress. The ability of AZD7762, an ATP-competitive Chk1/2 inhibitor to increase the efficacy of the DNA-damaging agents bendamustine, melphalan, and doxorubicin was examined using four human myeloma cell lines, KMS-12-BM, KMS-12-PE, RPMI-8226, and U266B1. The in vitro activity of AZD7762 as monotherapy and combined with alkylating agents and the "novel" drug bortezomib was evaluated by studying its effects on cytotoxicity, signaling, and apoptotic pathways. The Chk1/2 inhibitor AZD7762 potentiated the antiproliferative effects of bendamustine, melphalan, and doxorubicin but not bortezomib in multiple myeloma cell lines that were p53-deficient. Increased γH2AX staining in cells treated with bendamustine or melphalan plus AZD7762 indicates a greater degree of DNA damage with combined therapy. Abrogation of the G(2)-M checkpoint by AZD7762 resulted in mitotic catastrophe with ensuing apoptosis evidenced by PARP and caspase-3 cleavage. In summary, the cytotoxic effects of bendamustine, melphalan and doxorubicin on p53-deficient multiple myeloma cell lines were enhanced by the coadministration of AZD7762. These data provide a rationale for testing these combinations in patients with relapsed and/or refractory multiple myeloma.
Department of Medicine, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA. Landauh@mskcc.org
Heather J
HJ
Landau
Samuel C
SC
McNeely
Jayasree S
JS
Nair
Raymond L
RL
Comenzo
Takashi
T
Asai
Hillel
H
Friedman
Suresh C
SC
Jhanwar
Stephen D
SD
Nimer
Gary K
GK
Schwartz
D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects* / Q000235:genetics; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D000071877:Checkpoint Kinase 1; D004357:Drug Synergism; D006801:Humans; D048629:Micronuclei, Chromosome-Defective / Q000139:chemically induced; D009101:Multiple Myeloma / Q000188:drug therapy / Q000235:genetics*; D009154:Mutation; D047428:Protein Kinase Inhibitors / Q000494:pharmacology* / Q000633:toxicity; D011494:Protein Kinases / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D013876:Thiophenes / Q000494:pharmacology* / Q000633:toxicity; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*; D014508:Urea / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000633:toxicity
C532363:3-(carbamoylamino)-5-(3-fluorophenyl)-N-(3-piperidyl)thiophene-2-carboxamide; D000970:Antineoplastic Agents; D047428:Protein Kinase Inhibitors; D013876:Thiophenes; D016159:Tumor Suppressor Protein p53; D014508:Urea; D011494:Protein Kinases; C000605867:CHEK1 protein, human; D000071877:Checkpoint Kinase 1