Quizartinib

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Quizartinib

CAS No. : 950769-58-1

MCE 国际站：Quizartinib

产品活性：Quizartinib (AC220) 是一种具有口服活性的、高选择性的，有效的第二代 Ⅱ 型 FLT3 (type II FLT3) 酪氨酸激酶抑制剂，K_d 值为 1.6 nM。Quizartinib 抑制 Wt FLT3 和 突变型 FLT3-ITD 自磷酸化，IC₅₀ 分别为 4.1 nM 和 1.1 nM。Quizartinib 可以通过优化的 linker 与 VHL 配体连接，从而形成 PROTAC Flt3 降解剂。Quizartinib 诱导细胞凋亡 (apoptosis)。

研究领域：Protein Tyrosine Kinase/RTK  |  PROTAC  |  Apoptosis  |  Autophagy

作用靶点：FLT3  |  Ligands for Target Protein for PROTAC  |  Apoptosis  |  Autophagy

In Vitro: Quizartinib (AC220) is a novel compound expressly optimized as a FLT3 inhibitor for the treatment of acute myeloid leukemia (AML). Quizartinib inhibits FLT3-WT and FLT3-ITD autophosphorylation with IC₅₀ of 4.2±0.3 nM and 1.1±0.1 nM, respectively. Quizartinib inhibits MV4-11 and A375 cells with IC₅₀ of 0.56±0.3 nM and >10 000 nM, respectively. Quizartinib inhibits FLT3 with low nanomolar potency in cellular assays and is highly selective when screened against the majority of the human protein kinome.

In Vivo: Quizartinib (AC220) inhibits FLT3 activity in vivo, significantly extends survival in a mouse model of FLT3-ITD AML at doses as low as 1 mg/kg when dosed orally once a day, eradicates tumors in a FLT3-dependent mouse xenograft model at 10 mg/kg, and potently inhibits FLT3 activity in primary patient cells. The oral bioavailability of Quizartinib, determined in rats by comparing oral and intravenous pharmacokinetics at 3 mg/kg, is approximately 40%. A single 10 mg/kg dose of Quizartinib is administered by oral gavage, and mice are killed at 2 time points after dosing, using groups of 4 animals each. Quantitation of total FLT3 and phospho-FLT3 in tumor samples revealed time-dependent inhibition of FLT3 autophosphorylation. FLT3 activity is inhibited by 90% at 2 hours, and 40% at 24 hours after administration. The extent of inhibition therefore correlated well with the expected free Quizartinib plasma levels, based on pharmacokinetic experiments.

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