GZD824

GZD824 is an orally bioavailable inhibitor of Bcr-Abl with IC50 values of 0.34 and 0.68 nM for Bcr-AblWT and Bcr-AblT315I, respectively [1].

Bcr-Abl is a fused protein that interacts with the interleukin-3 receptorβ(c) subunit and has tyrosine kinase activity. Abl activates cell cycle-related proteins and enzymes and increases cell division. Bcr-Abl inhibits DNA repair and causes genomic instability.

GZD824 is an orally bioavailable Bcr-Abl inhibitor. GZD824 exhibited high affinity with Kd values of 0.32 and 0.71 nM for Bcr-AblWT and Bcr-AblT315I, respectively. GZD824 inhibited Bcr-Abl with IC50 values of 0.34, 0.68, 0.27, 0.71, 0.15, 0.35, 0.29 and 0.35 nM for Bcr-AblWT, Bcr-AblT315I, Bcr-AblE255K, Bcr-AblG250E, Bcr-AblQ252H, Bcr-AblH396P, Bcr-AblM351T and Bcr-AblY253F, respectively. In a competitive binding assay, GZD824 bound to the ATP-binding sites of native Abl with Kd values of 0.32 and 0.34 nM for non-phosphorylated and phosphorylated Abl. In stably transformed Ba/F3 cells, GZD824 potently inhibited cells growth with IC50 values of 1.0 and 7.1 nM for Bcr-AblWT and Bcr-AblT315I expressed cells, respectively [1].

In mouse xenograft tumor models, GZD824 inhibited tumor growth. In mice bearing an allograft leukemia model, GZD824 significantly increased survival [1].

Reference:
Ren X, Pan X, Zhang Z, et al.  Identification of GZD824 as an orally bioavailable inhibitor that targets phosphorylated and nonphosphorylated breakpoint cluster region-Abelson (Bcr-Abl) kinase and overcomes clinically acquired mutation-induced resistance against imatinib. J Med Chem, 2013, 56(3): 879-894.

Identification of GZD824 as an orally bioavailable inhibitor that targets phosphorylated and nonphosphorylated breakpoint cluster region-Abelson (Bcr-Abl) kinase and overcomes clinically acquired mutation-induced resistance against imatinib.[Pubmed:23301703]

J Med Chem. 2013 Feb 14;56(3):879-94.

Bcr-Abl(T315I) mutation-induced imatinib resistance remains a major challenge for clinical management of chronic myelogenous leukemia (CML). Herein, we report GZD824 (10a) as a novel orally bioavailable inhibitor against a broad spectrum of Bcr-Abl mutants including T315I. It tightly bound to Bcr-Abl(WT) and Bcr-Abl(T315I) with K(d) values of 0.32 and 0.71 nM, respectively, and strongly inhibited the kinase functions with nanomolar IC(50) values. The compound potently suppressed proliferation of Bcr-Abl-positive K562 and Ku812 human CML cells with IC(50) values of 0.2 and 0.13 nM, respectively. It also displayed good oral bioavailability (48.7%), a reasonable half-life (10.6 h), and promising in vivo antitumor efficacy. It induced tumor regression in mouse xenograft tumor models driven by Bcr-Abl(WT) or the mutants and significantly improved the survival of mice bearing an allograft leukemia model with Ba/F3 cells harboring Bcr-Abl(T315I). GZD824 represents a promising lead candidate for development of Bcr-Abl inhibitors to overcome acquired imatinib resistance.

GZD824 Dimesylate is a novel orally bioavailable Bcr-Abl inhibitor for Bcr-Abl(WT) and Bcr-Abl(T315I) with IC50 of 0.34 nM and 0.68 nM, respectively.

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