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Discovery of a highly potent kinase inhibitor capable of overcoming multiple imatinib-resistant ABL mutants for chronic myeloid leukemia (CML).

Research paper by Tingting T Lu, Jiangyan J Cao, Fengming F Zou, Xixiang X Li, Aoli A Wang, Wenliang W Wang, Huamin H Liang, Qingwang Q Liu, Chen C Hu, Cheng C Chen, Zhenquan Z Hu, Wenchao W Wang, Lili L Li, Jian J Ge, Yang Y Shen, et al.

Indexed on: 15 Feb '21Published on: 14 Feb '21Published in: European Journal of Pharmacology



Abstract

As the critical driving force for chronic myeloid leukemia (CML), BCR gene fused ABL kinase has been extensively explored as a validated target of drug discovery. Although imatinib has achieved tremendous success as the first-line treatment for CML, the long-term application ultimately leads to resistance, primarily via various acquired mutations occurring in the BCR-ABL kinase. Although dasatinib and nilotinib have been approved as second-line therapies that could overcome some of these mutants, the most prevalent gatekeeper T315I mutant remains unconquered. Here, we report a novel type II kinase inhibitor, CHMFL-48, that potently inhibits the wild-type BCR-ABL (wt) kinase as well as a panel of imatinib-resistant mutants, including T315I, F317L, E255K, Y253F, and M351T. CHMFL-48 displayed great inhibitory activity against ABL wt (IC: 1 nM, 70-fold better than imatinib) and the ABL T315I mutant (IC: 0.8 nM, over 10,000-fold better than imatinib) in a biochemical assay and potently blocked the autophosphorylation of BCR-ABL wt and BCR-ABL mutants in a cellular context, which further affected downstream signalling mediators, including signal transducer and activator of transcription 5 (STAT5) and CRK like proto-oncogene (CRKL), and led to the cell cycle progression blockage as well as apoptosis induction. CHMFL-48 also exhibited great anti-leukemic efficacies in vivo in K562 cells and p210-T315I-transformed BaF3 cell-inoculated murine models. This discovery extended the pharmacological diversity of BCR-ABL kinase inhibitors and provided more potential options for anti-CML therapies. Copyright © 2021 Elsevier B.V. All rights reserved.

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