JAK3-IN-1

• CAT Number: I002348
• CAS Number: 1805787-93-2
• Molecular Formula: C26H30ClN7O2
• Molecular Weight: 508.02
• Purity: ≥95%
• Synonyms: N-[3-[[[5-chloro-2-[2-methoxy-4-(4-methylpiperazin-1-yl)anilino]pyrimidin-4-yl]amino]methyl]phenyl]prop-2-enamide
• InChI: InChI=1S/C26H30ClN7O2/c1-4-24(35)30-19-7-5-6-18(14-19)16-28-25-21(27)17-29-26(32-25)31-22-9-8-20(15-23(22)36-3)34-12-10-33(2)11-13-34/h4-9,14-15,17H,1,10-13,16H2,2-3H3,(H,30,35)(H2,28,29,31,32)
• InChIKey: UGXCBYVBIJACEK-UHFFFAOYSA-N
• SMILES: CN1CCN(CC1)C2=CC(=C(C=C2)NC3=NC=C(C(=N3)NCC4=CC(=CC=C4)NC(=O)C=C)Cl)OC

JAK3-IN-1 is a potent, selective and orally active JAK3 inhibitor with an IC50 of 4.8 nM. JAK3-IN-1 shows over 180-fold more selective for JAK3 than JAK1 (IC50 of 896 nM) and JAK2 (IC50 of 1050 nM)[1].
JAK3-IN-1(Compound 9; 0-5 µM; 3 hours; BMDMs cells) treatment completely inhibits IL-4 induced p-STAT6 at a concentration of 500 nM and only partially inhibits IFNβ-induced p-STAT1 at a concentration of 5.0 μM[1]..
JAK3-IN-1(Compound 9) most potently inhibits JAK3 and identified fms-related tyrosine kinase 3 (FLT3) and several tyrosine protein kinase (TEC)-family kinases as being potential off-targets. Enzymatic assays using the Z’-lyte or LanthaScreen formats confirmed enzymatic inhibition of FLT3 (IC50 = 13 nM), TTK protein kinase (TTK, IC50 = 49 nM), BLK proto-oncogene (BLK, IC50 = 157 nM) and tyrosine protein kinase TXK (TXK, IC50 = 36 nM). JAK3-IN-1 shows very low inhibition scores for other JAKs and wild-type (WT) EGFR, which is consistent with the over 180-fold higher IC50s against EGFRWT and TYK2 (IC50s =409 nM, > 10000 respectively). JAK3-IN-1 possesses over 165-fold higher IC50s for BTK or ITK (IC50s = 794 and 1070 nM respectively)[1].
JAK3-IN-1(Compound 9) selectively inhibits the proliferation of JAK3-dependent Ba/F3 cells (IC50 = 69 nM) relative to other JAK-dependent Ba/F3 cells, for which there was no antiproliferative effect at concentrations below 3.0 μM[1].
JAK3-IN-1(Compound 9) shows reasonable pharmacokinetic properties, with moderate T1/2 of 1.4 h, area under the curve (AUC) value of 795 ng*hr/mL following a 10 mg/Kg oral dose and good oral bioavailability of 66%.
After oral administration with JAK3-IN-1(Compound 9) (75 mpk, QD) for 8 days, the numbers of B or T lymphocytes in the tumor-bearing lungs and spleens of treated mice is not affected, however, the number of NK cells is reduced[1].

Reference

[1]. Tan L, et al. Development of Selective Covalent Janus Kinase 3 Inhibitors. J Med Chem. 2015 Aug 27;58(16):6589-6606.
 [Content Brief]