Pacritinib

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产品价格：电议采购度：1594 原产地：美洲

发布时间：2021/7/24 6:06:39 所属地区：上海上海市

简要描述：

Pacritinib (SB1518) 是一种有效的野生型 JAK2 和 JAK2V617F 突变型抑制剂，IC50 分别为 23 nM 和 19 nM。Pacritinib 也抑制 FLT3 及其突变型 FLT3D835Y，IC50 分别为 22 nM 和 6 nM。

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标签：SB1518

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Pacritinib

CAS No. : 937272-79-2

MCE 站：Pacritinib

产品活性：Pacritinib (SB1518) 是一种有效的野生型 JAK2 和 JAK2^V617F 突变型抑制剂，IC₅₀ 分别为 23 nM 和 19 nM。Pacritinib 也抑制 FLT3 及其突变型 FLT3^D835Y，IC₅₀ 分别为 22 nM 和 6 nM。

研究领域：Protein Tyrosine Kinase/RTK | JAK/STAT Signaling | Epigenetics | Stem Cell/Wnt

作用靶点：FLT3 | JAK

In Vitro: Relative to JAK2, Pacritinib (SB1518) is two-fold less potent against TYK2 (IC₅₀=50 nM), 23-fold less potent against JAK3 (IC₅₀=520 nM) and 56-fold less potent against JAK1 (IC₅₀=1280 nM). The rest of the evaluated kinases show <30% inhibition when tested against 100 nM Pacritinib at adenosine triphosphate concentrations equivalent to its Michaelis constant (K_m). Pacritinib inhibits MV4-11 and MOLM-13 cells (both of which are cell lines derived from human acute myeloid leukemias driven by an FLT3 ITD mutation) with IC₅₀ of 47 and 67 nM, respectively. Pacritinib inhibits Karpas 1106P and Ba/F3-JAK2^V617F cells (which are cell lines dependent on JAK2 signaling) with IC₅₀ of 348 and 160 nM, respectively. FLT3-ITD harboring MV4-11 cells are treated for 3 h with different concentrations of Pacritinib (SB1518) and pFLT3, pSTAT5 and pERK1/2 levels are quantified. Pacritinib leads to a dose-dependent decrease of pFLT3, pSTAT5, pERK1/2 and pAkt with IC₅₀ of 80, 40, 33 and 29 nM, respectively. The IC₅₀ on auto-phosphorylation of FLT3-wt in RS4;11 is four-fold higher (IC₅₀=600 nM) compare with FLT3-ITD in MV4-11 and MOLM-13 cells. However, STAT5 inhibition is detected at much lower concentrations of Pacritinib (IC₅₀=8 nM).

In Vivo: For evaluation of efficacy in the Ba/F3-JAK2^V617F engraftment model, mice are treated with Pacritinib (SB1518) at doses of 50 or 150 mg/kg p.o. q.d. for 13 days, with drug dosing starting 4 days after cell inoculation. At study termination, the vehicle control mice exhibit splenomegaly and hepatomegaly (~7- and 1.3-fold, respectively), reminiscent of the symptoms found in patients with symptomatic myelofibrosis. SB1518 treatment at 150 mg/kg p.o. q.d. significantly ameliorates all these symptoms, with 60% (±9%) normalization of spleen weight and 92% (±5%) normalization of liver weight and is well tolerated without significant weight loss or any hematological toxicities, including thrombocytopenia and anemia. In rats, Pacritinib (SB1518) shows moderately fast absorption (t_max=4 h), with a peak concentration of 114 ng/mL, AUC of 599 ng?h/mL, and a terminal half-life of ~6 h following a single oral dose of 10 mg/kg. In dogs, Pacritinib (SB1518) is rapidly absorbed (t_max=2.0 h), with a peak concentration of ~12 ng/mL, AUC of 53 ng?h/mL, and a terminal half-life of 3.4 h following a single oral dose of 3 mg/kg.

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更新时间：2024/1/2 10:14:41

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