Pacritinib (SB1518)

Catalog No.S8057

Pacritinib (SB1518) Chemical Structure

Molecular Weight(MW): 472.58

Pacritinib (SB1518) is a potent and selective inhibitor of Janus Kinase 2 (JAK2) and Fms-Like Tyrosine Kinase-3 (FLT3) with IC50s of 23 and 22 nM in cell-free assays, respectively. Phase 3.

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Biological Activity

Description Pacritinib (SB1518) is a potent and selective inhibitor of Janus Kinase 2 (JAK2) and Fms-Like Tyrosine Kinase-3 (FLT3) with IC50s of 23 and 22 nM in cell-free assays, respectively. Phase 3.
Features Dual JAK2/FLT3 inhibitor that has progressed to Phase III clinical trials for treatment of Myelofibrosis.
Targets
FLT3 (D835Y) [1]
(Cell-free assay)
JAK2 (V617F) [1]
(Cell-free assay)
FLT3 [1]
(Cell-free assay)
JAK2 [1]
(Cell-free assay)
TYK2 [1]
(Cell-free assay)
6 nM 19 nM 22 nM 23 nM 50 nM
In vitro

Pacritinib is a potent inhibitor of both wild-type JAK2 and JAK2V617F mutant (IC50= 19 nM) that is present in high frequencies among patients with MPD. Relative to JAK2, Pacritinib 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). Pacritinib effectively permeates cells to modulate signaling pathways downstream of JAK2, whether agonist activated or mutationally activated. Pacritinib induces apoptosis, cell cycle arrest and antiproliferative effects in JAK2WT- and JAK2V617F-dependent cells. Pacritinib inhibits cell proliferation of Karpas 1106P and Ba/F3-JAK2V617F with IC50 of 348 and 160 nM, respectively. Pacritinib inhibits endogenous colony growth derived from erythroid and myeloid progenitors with IC50 of 63 and 53 nM , respectively. [1] SB1518 also inhibits FLT3 and its mutant FLT3-D835Y(IC50= 6 nM ). Pacritinib inhibits FLT3 phosphorylation and downstream STAT, MAPK and PI3K signaling in FLT3-internal-tandem duplication (ITD), FLT3-wt cells and primary AML blast cells. Pacritinib treatment leads to a dose-dependent decrease of pFLT3, pSTAT5, pERK1/2 and pAkt in FLT3-ITD harboring MV4-11 cells with IC50 of 80, 40, 33 and 29 nM , respectively. Treatment of the primary AML blast cells with Pacritinib for 3 h leads to a dose-dependent decrease of pFLT3, pSTAT3 and pSTAT5 with an IC50 below 0.5 μM. Pacritinib induces apoptosis, cell cycle arrest and anti-proliferative effects in FLT3-mutant and FLT3-wt cells. Pacritinib inhibits cell proliferation of FLT3-ITD-harboring cells MV4-11 and primary AML blast cells with IC50s of 47 nM and 0.19-1.3 μM, respectively. [2]

In vivo Pacritinib administrated at 150 mg/kg p.o. q.d. to JAK2V617F-dependent xenograft model, significantly ameliorates splenomegaly and hepatomegaly symptoms, with 60% normalization of spleen weight and 92% normalization of liver weight and is well tolerated without significant weight loss or any hematological toxicities, including thrombocytopenia and anemia. Pacritinib induces dose-dependent inhibition of tumor growth of JAK2V617F-dependent SET-2 xenograft model (40% for 75 mg/kg and 61% for 150 mg/kg). [1] Pacritinib is efficacious in FLT3-ITD-bearing MV4-11 xenograft models. Pacritinib treated once daily for 21 consecutive days, induces dose-dependent inhibition of tumor growth (38% for 25 mg/kg, 92% for 50 mg/kg and 121% for 100 mg/kg). Complete regression is observed in 3/10 and 8/8 mice for the 50 and 100 mg/kg/day groups, respectively. [2]

Protocol

Kinase Assay:[1]
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kinase activity assays:

All assays are carried out in 384-well white microtiter plates. Compounds are 4-fold serially diluted in 8 steps, starting from 10 μM. The reaction mixture consisted of 25 μL assay buffer (50 mM HEPES pH 7.5, 10 mM MgCl2, 5 mM MnCl2, 1 mM DTT, 0.1 mM Na3VO4, 5 mM β-glycerol phosphate). For FLT3 assays, the reaction contains 2.0 μg/mL FLT3 enzyme, 5 μM of poly(Glu,Tyr) substrate and 4 μM of ATP. For JAK1 assays, the reaction contains 2.5 μg/mL of JAK1 enzyme, 10 μM of poly(Glu,Ala,Tyr) substrate and 1.0 μM of ATP. For JAK2 assays, the reaction contained 0.35 μg/mL of JAK2 enzyme, 10 μM of poly (Glu,Ala,Tyr) substrate and 0.15 μM of ATP. For JAK3 assays, the reaction contained 3.5 μg/mL of JAK3 enzyme, 10 μM of poly (Glu,Ala,Tyr) substrate and 6.0 μM of ATP. For TYK2 assays, the reaction contained 2.5 μg/mL of TYK2 enzyme, 10 μM of poly (Glu,Ala,Tyr) substrate and 0.15 μM of ATP. The reaction is incubated at room temperature for 2 h prior to addition of 13 μL PKLight® detection reagent. After 10 min incubation luminescent signals are read on a multi-label plate reader.
Cell Research:[1]
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  • Cell lines: Karpas 1106P cells
  • Concentrations: ~10 μM
  • Incubation Time: 2 days
  • Method: Cells are seeded at 30-50% confluency in 96-well plates and are treated with different concentrations of compounds (in triplicate) for 48 h. Cell viability is monitored using the CellTiter-Glo assay.
    (Only for Reference)
Animal Research:[1]
+ Expand
  • Animal Models: Human megakaryoblastic leukemia xenografts SET-2
  • Formulation: 0.5% methylcellulose (w/v) and 0.1% Tween-80 in H2O
  • Dosages: 150 mg/kg
  • Administration: oral gavage
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 11 mg/mL warmed (23.27 mM)
Water Insoluble
Ethanol Insoluble

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 472.58
Formula

C28H32N4O3

CAS No. 937272-79-2
Storage powder
Synonyms N/A

Bio Calculators

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Clinical Trial Information

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT02891603 Not yet recruiting Graft Vs Host Disease|GVHD H. Lee Moffitt Cancer Center and Research Institute April 30, 2017 Phase 1|Phase 2
NCT02677948 Suspended Chronic Lymphocytic Leukemia|Lymphoma, Small Lymphocytic University of Michigan Cancer Center October 2016 Phase 1|Phase 2
NCT02564536 Not yet recruiting Chronic Myelomonocytic Leukemia|Juvenile Myelomonocytic Leukemia|Atypical Chronic Myeloid Leukemia|Myeloproliferative Neoplasm|Myelodysplastic Syndromes|Myelofibrosis Washington University School of Medicine|CTI BioPharma October 2016 Early Phase 1
NCT02323607 Recruiting Recurrent Adult Acute Myeloid Leukemia|Secondary Acute Myeloid Leukemia|Therapy-Related Acute Myeloid Leukemia|Untreated Adult Acute Myeloid Leukemia Bhavana Bhatnagar|CTI BioPharma|Ohio State University Comprehensive Cancer Center January 2016 Phase 1
NCT02342353 Recruiting Non-Small Cell Lung Cancer|Nonsmall Cell Lung Cancer|Carcinoma, Non-Small-Cell Lung Washington University School of Medicine December 2015 Phase 1|Phase 2
NCT02584777 Withdrawn Primary Myelofibrosis Baxalta US Inc.|CTI BioPharma November 2015 Phase 2

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID