Momelotinib (CYT387)

Selective JAK Inhibitor

Fedratinib (SAR302503, TG101348) : JAK2-selective, IC50=3 nM.

Most Potent JAK Inhibitor

AZD1480 : JAK2, IC50=0.26 nM.

FDA-approved JAK Inhibitor

Tofacitinib (CP-690550,Tasocitinib) : Approved by FDA for rheumatoid arthritis (RA).

Newest JAK Inhibitor

XL019 ^New : Potent and selective JAK2 inhibitor with IC50 of 2.2 nM, exhibiting >50-fold selectivity over JAK1, JAK3 and TYK2.

FLLL32 ^New

FLLL32 is a potent JAK2/STAT3 inhibitor with IC50 of <5 μM. FLLL32 inhibits the induction of STAT3 phosphorylation by IFNα and IL-6 in breast cancer cells.

Cerdulatinib (PRT062070) hydrochloride ^New

Cerdulatinib (PRT-062070, PRT2070) hydrochloride is an oral active, multi-targeted tyrosine kinase inhibitor with IC50 of 12 nM/6 nM/8 nM/0.5 nM and 32 nM for JAK1/JAK2/JAK3/TYK2 and Syk, respectively. Also inhibits 19 other tested kinases with IC50 less than 200 nM.

Ruxolitinib (INCB018424)

Ruxolitinib (INCB018424) is the first potent, selective, JAK1/2 inhibitor to enter the clinic with IC50 of 3.3 nM/2.8 nM in cell-free assays, >130-fold selectivity for JAK1/2 versus JAK3. Ruxolitinib kills tumor cells through toxic mitophagy. Ruxolitinib induces autophagy and enhances apoptosis.

Tofacitinib (CP-690550) Citrate

Tofacitinib citrate (CP-690550, Tasocitinib) is a novel inhibitor of JAK with IC50 of 1 nM, 20 nM and 112 nM against JAK3, JAK2, and JAK1, respectively. Tofacitinib citrate has anti-infection activity.

Tofacitinib (CP-690550)

Tofacitinib (CP-690550,Tasocitinib) is a novel inhibitor of JAK3 with IC50 of 1 nM in cell-free assays, 20- to 100-fold less potent against JAK2 and JAK1. Tofacitinib inhibits the expression of antiapoptotic BCL-A1 and BCL-XL in human plasmacytoid dendritic cells (PDC) and induced PDC apoptosis.

AZD1480

AZD1480 is a novel ATP-competitive JAK2 inhibitor with IC50 of 0.26 nM in a cell-free assay, selectivity against JAK3 and Tyk2, and to a smaller extent against JAK1. Phase 1.

Fedratinib (TG101348)

Fedratinib (SAR302503, TG101348) is a selective inhibitor of JAK2 with IC50 of 3 nM in cell-free assays, 35- and 334-fold more selective for JAK2 versus JAK1 and JAK3. Fedratinib also inhibits FMS-like tyrosine kinase 3 (FLT3) and RET (c-RET) with IC50 of 15 nM and 48 nM, respectively. Fedratinib has potential antineoplastic activity. Fedratinib inhibits proliferation and induces apoptosis. Phase 2.

WP1066

WP1066 is a novel inhibitor of JAK2 and STAT3 with IC50 of 2.30 μM and 2.43 μM in HEL cells; shows activity to JAK2, STAT3, STAT5, and ERK1/2 not JAK1 and JAK3. WP1066 induces apoptosis. Phase 1.

Features:Similar to its parent compound AG490, WP1066 inhibits the phosphorylation of JAK2, but unlike AG490, WP1066 also degraded JAK2 protein.

Baricitinib (INCB028050)

Baricitinib (LY3009104, INCB028050) is a selective JAK1 and JAK2 inhibitor with IC50 of 5.9 nM and 5.7 nM in cell-free assays, ~70 and ~10-fold selective versus JAK3 and Tyk2, no inhibition to c-Met and Chk2. Baricitinib is found to reduce or interrupt the passage of the virus into target cells and is used in the treatment research for COVID-19. Phase 3.