For research use only. Not for use in humans.

Catalog No.S5904

WHI-P97 Chemical Structure

Molecular Weight(MW): 455.10

WHI-P97 is a potent inhibitor of JAK-3 with an estimated Ki value of 0.09 μM in modeling studies and a measured IC50 value of 2.5 μM in EGFR kinase inhibition assays.

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Biological Activity

Description WHI-P97 is a potent inhibitor of JAK-3 with an estimated Ki value of 0.09 μM in modeling studies and a measured IC50 value of 2.5 μM in EGFR kinase inhibition assays.
JAK3 [1]
In vitro

Treatment of mast cells with WHI-P97 inhibited the translocation of 5-lipoxygenase (5-LO) from the nucleoplasm to the nuclear membrane and consequently 5-LO-dependent leukotriene (LT) synthesis after IgE receptor/FcεRI crosslinking by >90% at low micromolar concentrations. WHI-P97 does not directly inhibit the enzymatic activity of 5-LO, but prevented its translocation to the nuclear membrane without affecting the requisite calcium signal[1].

In vivo WHI-P97 was very well tolerated in mice, with no signs of toxicity at dose levels ranging from 5 μg/kg to 50 mg/kg, and LD10was not reached at a 50 mg/kg dose level when administered as a single i.p. or i.v. bolus dose. Therapeutic WHI-P97 concentrations, which inhibit mast cell leukotriene synthesis in vitro, could easily be achieved in vivo after the i.v. or i.p. administration of a single nontoxic 40 mg/kg bolus dose of WHI-P97. WHI-P97 showed promising biological activity in a mouse model of allergic asthma at nontoxic dose levels. Treatment of ovalbumin-sensitized mice with WHI-P97 prevented the development of airway hyper-responsiveness to methacholine in a dose-dependent fashion. WHI-P97 inhibited the eosinophil recruitment to the airway lumen after the ovalbumin challenge in a dose-dependent fashion. WHI-P97 had an elimination half-life (t1/2) of 58.9 min and systemic clearance (CL) of 891 ml/h/kg in CD-1 mice and a t1/2 of 84.2 min and CL of 1513 ml/h/kg in BALB/c mice. The values for AUC and Cmaxwere 107.3 μM·h and 296.7 μM, respectively, in CD-1 mice, and 58.4 μM·h and 212.7 μM, respectively, in BALB/c mice. The large volume of distribution [322 ml/kg in CD-1 mice and 415 ml/kg in BALB/c mice; ∼6-fold greater than the plasma volume (50 ml/kg)] suggests that WHI-P97 may be extensively partitioned into extravascular compartments[1].


Cell Research:


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  • Cell lines: RBL-2H3 cells
  • Concentrations: 30 μM
  • Incubation Time: 30 min
  • Method:

    RBL-2H3 cells were cultured overnight on 22- × 22-mm coverslips at a cell density of 0.01 × 106/ml with 0.24 mg/ml DNP-IgE. Sensitized RBL-2H3 cells were then treated with 30 μM WHI-P97, WHI-P131, or vehicle before challenge with 20 ng/ml DNP-BSA at 37°C. After stimulation with DNP-BSA, the cells were fixed in cold methanol for 30 min, permeabilized in cold acetone, and blocked with 1% BSA containing nonimmune goat serum. Staining of mast cells with primary and secondary antibodies followed by confocal laser scanning microscopy.

    (Only for Reference)
Animal Research:


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  • Animal Models: female CD-1 or male BALB/c mice
  • Formulation: PBS supplemented with 10% dimethyl sulfoxide
  • Dosages: 40 mg/kg
  • Administration: i.v. and i.p.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 8 mg/mL (17.57 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 455.10


CAS No. 211555-05-4
Storage powder
in solvent
Synonyms N/A
Smiles COC1=CC2=NC=NC(=C2C=C1OC)NC3=CC(=C(O)C(=C3)Br)Br

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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.

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JAK Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID