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Ref Type Journal Article
PMID (26045609)
Authors Pan R, Ruvolo VR, Wei J, Konopleva M, Reed JC, Pellecchia M, Andreeff M, Ruvolo PP
Title Inhibition of Mcl-1 with the pan-Bcl-2 family inhibitor (-)BI97D6 overcomes ABT-737 resistance in acute myeloid leukemia.
Journal Blood
Vol 126
Issue 3
Date 2015 Jul 16
Abstract Text Overexpression of antiapoptotic Bcl-2 proteins such as Bcl-2, Bcl-xL, and Mcl-1 is widely associated with tumor initiation, progression, and chemoresistance. Furthermore, it has been demonstrated that Mcl-1 upregulation renders several types of cancers resistant to the Bcl-2/Bcl-xL inhibitors ABT-737 and ABT-263. The emerging importance of Mcl-1 in pathogenesis and drug resistance makes it a high-priority therapeutic target. In this study, we showed that inhibition of Mcl-1 with a novel pan-Bcl-2 inhibitor (-)BI97D6 potently induced apoptosis in acute myeloid leukemia (AML) cells. (-)BI97D6 induced hallmarks of mitochondrial apoptosis, disrupted Mcl-1/Bim and Bcl-2/Bax interactions, and stimulated cell death via the Bak/Bax-dependent mitochondrial apoptosis pathway, suggesting on-target mechanisms. As a single agent, this pan-Bcl-2 inhibitor effectively overcame AML cell apoptosis resistance mediated by Mcl-1 or by interactions with bone marrow mesenchymal stromal cells. (-)BI97D6 was also potent in killing refractory primary AML cells. Importantly, (-)BI97D6 killed AML leukemia stem/progenitor cells while largely sparing normal hematopoietic stem/progenitor cells. These findings demonstrate that pan-Bcl-2 inhibition by an Mcl-1-targeting inhibitor not only overcomes intrinsic drug resistance ensuing from functional redundancy of Bcl-2 proteins, but also abrogates extrinsic resistance caused by the protective tumor microenvironment.


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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
(-)BI97D6 (-)BI97D6 1 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
(-)BI97D6 BCL2 Family Inhibitor 6 (-)BI97D6 is a pan-BCL2 family inhibitor, which inhibits BCL-2, MCL1, BCL-XL, and BFL1, resulting in increased tumor cell apoptosis (PMID: 26045609).
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
Unknown unknown acute myeloid leukemia not applicable (-)BI97D6 Preclinical - Patient cell culture Actionable In a preclinical study, (-)BI97D6 decreased live cell number in primary acute myeloid leukemia samples from refractory patients in culture (PMID: 26045609 ). 26045609