6gl8
Crystal structure of Bcl-2 in complex with the novel orally active inhibitor S55746Crystal structure of Bcl-2 in complex with the novel orally active inhibitor S55746
Structural highlights
Disease[BCL2_HUMAN] Note=A chromosomal aberration involving BCL2 has been found in chronic lymphatic leukemia. Translocation t(14;18)(q32;q21) with immunoglobulin gene regions. BCL2 mutations found in non-Hodgkin lymphomas carrying the chromosomal translocation could be attributed to the Ig somatic hypermutation mechanism resulting in nucleotide transitions. Function[BCL2_HUMAN] Suppresses apoptosis in a variety of cell systems including factor-dependent lymphohematopoietic and neural cells. Regulates cell death by controlling the mitochondrial membrane permeability. Appears to function in a feedback loop system with caspases. Inhibits caspase activity either by preventing the release of cytochrome c from the mitochondria and/or by binding to the apoptosis-activating factor (APAF-1).[1] Publication Abstract from PubMedEscape from apoptosis is one of the major hallmarks of cancer cells. The B-cell Lymphoma 2 (BCL-2) gene family encodes pro-apoptotic and anti-apoptotic proteins that are key regulators of the apoptotic process. Overexpression of the pro-survival member BCL-2 is a well-established mechanism contributing to oncogenesis and chemoresistance in several cancers, including lymphoma and leukemia. Thus, BCL-2 has become an attractive target for therapeutic strategy in cancer, as demonstrated by the recent approval of ABT-199 (Venclexta) in relapsed or refractory Chronic Lymphocytic Leukemia with 17p deletion. Here, we describe a novel orally bioavailable BCL-2 selective and potent inhibitor called S55746 (also known as BCL201). S55746 occupies the hydrophobic groove of BCL-2. Its selectivity profile demonstrates no significant binding to MCL-1, BFL-1 (BCL2A1/A1) and poor affinity for BCL-XL. Accordingly, S55746 has no cytotoxic activity on BCL-XL-dependent cells, such as platelets. In a panel of hematological cell lines, S55746 induces hallmarks of apoptosis including externalization of phosphatidylserine, caspase-3 activation and PARP cleavage. Ex vivo, S55746 induces apoptosis in the low nanomolar range in primary Chronic Lymphocytic Leukemia and Mantle Cell Lymphoma patient samples. Finally, S55746 administered by oral route daily in mice demonstrated robust anti-tumor efficacy in two hematological xenograft models with no weight lost and no change in behavior. Taken together, these data demonstrate that S55746 is a novel, well-tolerated BH3-mimetic targeting selectively and potently the BCL-2 protein. S55746 is a novel orally active BCL-2 selective and potent inhibitor that impairs hematological tumor growth.,Casara P, Davidson J, Claperon A, Le Toumelin-Braizat G, Vogler M, Bruno A, Chanrion M, Lysiak-Auvity G, Le Diguarher T, Starck JB, Chen I, Whitehead N, Graham C, Matassova N, Dokurno P, Pedder C, Wang Y, Qiu S, Girard AM, Schneider E, Grave F, Studeny A, Guasconi G, Rocchetti F, Maiga S, Henlin JM, Colland F, Kraus-Berthier L, Le Gouill S, Dyer MJS, Hubbard R, Wood M, Amiot M, Cohen GM, Hickman JA, Morris E, Murray J, Geneste O Oncotarget. 2018 Apr 13;9(28):20075-20088. doi: 10.18632/oncotarget.24744., eCollection 2018 Apr 13. PMID:29732004[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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