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Ref Type Journal Article
PMID (26627013)
Authors Baker A, Gregory GP, Verbrugge I, Kats L, Hilton JJ, Vidacs E, Lee EM, Lock RB, Zuber J, Shortt J, Johnstone RW
Title The CDK9 Inhibitor Dinaciclib Exerts Potent Apoptotic and Antitumor Effects in Preclinical Models of MLL-Rearranged Acute Myeloid Leukemia.
Journal Cancer research
Vol 76
Issue 5
Date 2016 Mar 01
URL
Abstract Text Translocations of the mixed lineage leukemia (MLL) gene occur in 60% to 80% of all infant acute leukemias and are markers of poor prognosis. MLL-AF9 and other MLL fusion proteins aberrantly recruit epigenetic regulatory proteins, including histone deacetylases (HDAC), histone methyltransferases, bromodomain-containing proteins, and transcription elongation factors to mediate chromatin remodeling and regulate tumorigenic gene expression programs. We conducted a small-molecule inhibitor screen to test the ability of candidate pharmacologic agents targeting epigenetic and transcriptional regulatory proteins to induce apoptosis in leukemic cells derived from genetically engineered mouse models of MLL-AF9-driven acute myeloid leukemia (AML). We found that the CDK inhibitor dinaciclib and HDAC inhibitor panobinostat were the most potent inducers of apoptosis in short-term in vitro assays. Treatment of MLL-rearranged leukemic cells with dinaciclib resulted in rapidly decreased expression of the prosurvival protein Mcl-1, and accordingly, overexpression of Mcl-1 protected AML cells from dinaciclib-induced apoptosis. Administration of dinaciclib to mice bearing MLL-AF9-driven human and mouse leukemias elicited potent antitumor responses and significantly prolonged survival. Collectively, these studies highlight a new therapeutic approach to potentially overcome the resistance of MLL-rearranged AML to conventional chemotherapies and prompt further clinical evaluation of CDK inhibitors in AML patients harboring MLL fusion proteins.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
KMT2A - MLLT3 acute myeloid leukemia sensitive Dinaciclib Preclinical Actionable In a preclinical study, treatment with Dinaciclib resulted in induced cell death of acute myeloid leukemia cells harboring KMT2A-MLLT3 in culture (PMID: 26627013). 26627013
KMT2A - MLLT1 NRAS G12D acute myeloid leukemia sensitive Dinaciclib Preclinical Actionable In a preclinical study, acute myeloid leukemia cells co-harboring KMT2A-MLLT1 and NRAS G12D demonstrated a decrease in tumor burden, reduced colony formation, and an increase in cell death when treated with Dinaciclib in both culture and mouse models (PMID: 26627013). 26627013
KMT2A - AFF1 acute myeloid leukemia sensitive Dinaciclib Preclinical Actionable In a preclinical study, treatment with Dinaciclib resulted in induced cell death of acute myeloid leukemia cells harboring KMT2A-AFF1 in culture (PMID: 26627013). 26627013