In vitro: PF-06651600, a newly discovered potent JAK3-selective inhibitor, is highly efficacious at inhibiting γc cytokine signaling, which is dependent on both JAK1 and JAK3. In vitro, it inhibits Th1 and Th17 cell differentiation and function. In total lymphocytes in human whole blood, PF-06651600 inhibits the phosphorylation of STAT5 elicited by IL-2, IL-4, IL-7, and IL-15 with IC50 values of 244, 340, 407, and 266 nM, respectively, and it inhibits the phosphorylation of STAT3 elicited by IL-21 with an IC50 of 355 nM.
In vivo: In vivo, PF-06651600 reduces disease pathology in rat adjuvant-induced arthritis as well as in mouse experimental autoimmune encephalomyelitis models. PF-06651600 has suitable pharmacokinetics and pharmacodynamics properties for preclinical and clinical evaluations. Human pharmacokinetics of PF-06651600 are predicted to show approximate values of blood clearance of 5.6 mL/min/kg, a steady state volume of distribution of 1.3 L/kg, oral bioavailability of 90%, and a systemic half-life of 2 h.
|Animal models||female Lewis rats (8 to 10 weeks old)|
|Formulation||2% Tween 80 /0.5% methylcellulose/deionized water|
|Dosages||80, 15, or 6 mg/kg|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
|Solubility||10 mM in DMSO|
Jak3 deficiency blocks innate lymphoid cell development.
Robinette ML, et al. Mucosal Immunol. 2018 Jan;11(1):50-60. PMID: 28513593.
Discovery of a JAK3-Selective Inhibitor: Functional Differentiation of JAK3-Selective Inhibition over pan-JAK or JAK1-Selective Inhibition.
Telliez JB, et al. ACS Chem Biol. 2016 Dec 16;11(12):3442-3451. PMID: 27791347.
|Related JAK Products|
Peficitinib (ASP015K, JNJ-54781532) is an orally bioavailable JAK inhibitor, with IC50s of 3.9, 5.0, 0.7 and 4.8 nM for JAK1, JAK2, JAK3 and Tyk2, respectively.
FLLL32 is a potent JAK2/STAT3 inhibitor with IC50 of <5 μM.
WHI-P97 is a JAK3 inhibitor with an estimated Ki value of 0.09 microM from modeling studies and a measured IC50 value of 2.5 microM in EGFR kinase inhibition assays.
SAR-20347 is a potent dual inhibitor of JAK1 and TYK2 with IC50 values of 23 and 0.6 nM, respectively.
Itacitinib, also known as INCB39110 or INCB039110, is a potent JAK1 tyrosine kinase inhibitor.
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