Ponatinib普纳替尼,943319-70-8

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Ponatinib

CAS No. : 943319-70-8

MCE 国际站：Ponatinib

产品活性：Ponatinib (AP24534) 是一种有效的，具有口服活性的多靶点激酶抑制剂，抑制 Abl，PDGFRα，VEGFR2，FGFR1 和 Src 的 IC₅₀ 分别为 0.37 nM， 1.1 nM，1.5 nM，2.2 nM 和 5.4 nM。

研究领域：Protein Tyrosine Kinase/RTK  |  Autophagy

作用靶点：Bcr-Abl  |  PDGFR  |  VEGFR  |  FGFR  |  Src  |  Autophagy

In Vitro: Ponatinib (AP24534) potently inhibits native ABL (IC₅₀: 0.37 nM), ABL^T315I (IC₅₀: 2.0 nM), and other clinically important ABL kinase domain mutants (IC₅₀: 0.30-0.44 nM). Ponatinib also inhibits SRC (IC₅₀: 5.4 nM) and members of the VEGFR, FGFR, and PDGFR families of receptor tyrosine kinases. Ponatinib potently inhibits proliferation of Ba/F3 cells expressing native BCR-ABL (IC₅₀: 0.5 nM). All BCR-ABL mutants tested remained sensitive to Ponatinib (IC₅₀: 0.5-36 nM) including BCR-ABL^T315I (IC₅₀: 11 nM).
Ponatinib inhibits the in vitro kinase activity of FLT3, KIT, FGFR1, and PDGFRα with IC₅₀ values of 13, 13, 2, and 1 nM, respectively. Ponatinib inhibits phosphorylation of all 4 RTKs in a dose-dependent manner, with IC₅₀ values between 0.3 to 20 nM. Consistent with these activated receptors being important in driving leukemogenesis Ponatinib also potently inhibits the viability of all 4 cell lines with IC₅₀ values of 0.5 to 17 nM. In contrast, the IC₅₀ for inhibition of RS4;11 cells which express native (unmutated) FLT3, is more than 100 nM.

In Vivo: In a survival model in which mice are instead injected with Ba/F3 BCR-ABL^T315I cells, administration of Dasatinib at doses as high as 300 mg/kg has no effect on survival time. By contrast, treatment with Ponatinib (AP24534) prolongs survival in a dose-dependent manner. Ponatinib dosed orally for 19 days at 5, 15, and 25 mg/kg prolongs median survival to 19.5, 26, and 30 days, respectively compare to 16 days for vehicle-treated mice (p<0.01 for all three dose levels). The anti-tumor activity of Ponatinib (AP24534) is further assessed in a xenograft model in which Ba/F3 BCR-ABL^T315I cells are injected subcutaneously into mice. Tumor growth is inhibited by Ponatinib in a dose-dependent manner compare to vehicle-treated mice, with significant suppression of tumor growth upon daily oral dosing at 10 and 30 mg/kg (%T/C = 68% and 20%, respectively; p<0.01 for both dose levels). Daily oral dosing of 50 mg/kg Ponatinib causes significant tumor regression (%T/C = 0.9%, p<0.01), with a 96% reduction in mean tumor volume at the final measurement compared to the start of treatment. Ponatinib is well tolerated at all efficacious dose levels for the duration of the study; maximal decreases in body weight are <5%, <5%, and <12% for the 10, 30, and 50 mg/kg dose groups, respectively, with no signs of overt toxicity.
Ponatinib (1-25 mg/kg) is administered orally, once daily for 28 days, to mice bearing MV4-11 xenografts. Ponatinib potently inhibits tumor growth in a dose-dependent manner. Administration of 1 mg/kg, the lowest dose tested, leads to significant inhibition of tumor growth (TGI=46%, P<0.01) and doses of 2.5 mg/kg or greater results in tumor regression.

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