Baricitinib (LY3009104, INCB028050)

Catalog No.S2851

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. Phase 3.

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Baricitinib (LY3009104, INCB028050) Chemical Structure

Baricitinib (LY3009104, INCB028050) Chemical Structure
Molecular Weight: 371.42

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Product Description

Biological Activity

Description 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. Phase 3.
Targets JAK2 [1]
(Cell-free assay)
JAK1 [1]
(Cell-free assay)
TYK2 [1]
(Cell-free assay)
JAK3 [1]
(Cell-free assay)

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IC50 5.7 nM 5.9 nM 53 nM >400 nM
In vitro Baricitinib inhibits IL-6–stimulated phosphorylation of the canonical substrate STAT3 (pSTAT3) and subsequent production of the chemokine MCP-1 with IC50 values of 44 nM and 40 nM, respectively, in PBMCs. Baricitinib also inhibits pSTAT3 stimulated by IL-23 with IC50 od 20 nM in isolated naive T-cells. [1]
In vivo Baricitinib inhibits IL-6–stimulated phosphorylation of STAT3 in whole blood with an IC50 of 128 nM. Baricitinib (10 mg/kg p.o.) is expected to inhibit JAK1/2 signaling (by ≥50%) in rats for about 8 hours. Baricitinib (10 mg/mL, p.o.) inhibits disease scores in dose-dependent manner in rats with established disease in the adjuvant arthritis model. Baricitinib treatment, compared with vehicle, inhibits the increase in hind paw volumes during the 2 weeks of treatment by 50% at a dose of 1 mg/kg and >95% at doses of 3 mg/kg or 10 mg/kg. Baricitinib treatment, compared with vehicle, also inhibits composite score of immune infiltrate, edema, and periarticular tissue appearance by 27% at a dose of 1 mg/kg, 64% at doses of 3 mg/kg and 82% at doses of 10 mg/kg in rats with established disease in the adjuvant arthritis model. Baricitinib reduces bone resorption by 15%, 61%, and 67% with increasing dose level (1, 3, and 10 mg/kg) in rats with established disease in the adjuvant arthritis model. Baricitinib (10 mg/kg, daily for 2 wk, p.o.) results in radiographic improvements with restoration of the normal architecture and appearance to the ankle and tarsals in rats with established disease in the adjuvant arthritis model. Baricitinib reduces levels of pSTAT3 in a dose- and time-dependent manner in the peripheral blood of rAIA animals. Baricitinib (10 mg/mL, p.o.) improves a composite score of joint damage by 47% in the murine CIA model. Baricitinib (10 mg/kg) reduces pannus (74%) and bone damage (78%) and improves cartilage damage (43%) and signs of inflammation (33%), resulting in a 53% improvement in an aggregate score of disease in the collagen Ab-induced arthritis (CAIA) murine model. Baricitinib (10 mg/kg) inhibits the delayed-type hypersensitivity response by 48% in both the CIA and CAIA models. [1] Baricitinib is efficacious in active rheumatoid arthritis patients refractory to disease modifying drugs and biologics. [2] Baricitinib preferentially inhibits JAK1 and JAK2, with 10-fold selectivity over Tyk2 and 100-fold over JAK3. The observed effects of GLPG-0634 on the ACR20, albeit in a smaller study, appear to be at least as good as that seen with tofacitinib and superior to that of baricitinib, since baricitinib only moderately affect the ACR20 values in Phase IIa clinical studies. [3] Baricitinib has the dose-limiting side-effect of inducing anaemia which has been attributed to its effects on JAK2 but has clearly shown efficacy. [4]

Protocol(Only for Reference)

Kinase Assay: [1]

Biochemical assays Enzyme assays are performed using a homogeneous time-resolved fluorescence assay with recombinant epitope tagged kinase domains (JAK1, 837-1142; JAK2, 828-1132; JAK3, 718-1124; Tyk2, 873-1187) or full-length enzyme (cMET and Chk2) and peptide substrate. Each enzyme reaction is performed with or without test compound (11-point dilution), JAK, cMET, or Chk2 enzyme, 500 nM (100 nM for Chk2) peptide, ATP (at the Km specific for each kinase or 1 mM), and 2.0% DMSO in assay buffer. The calculated IC50 value is the compound concentration required for inhibition of 50% of the fluorescent signal.

Animal Study: [1]

Animal Models Collagen-induced arthritis (CIA) mice
Formulation 0.5% methylcellulose
Dosages 10 mg/mL
Administration orally

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)
Body Surface Area (m2)0.0070.0250.
Km factor36128520
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.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)


[1] Fridman JS, et al. J Immunol, 2010, 184(9), 5298-5307.

[2] Kontzias A, et al. Curr Opin Pharmacol, 2012, 12(4), 464-470.

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Clinical Trial Information( data from, updated on 2016-07-30)

NCT Number Recruitment Conditions Sponsor
Start Date Phases
NCT02758613 Recruiting Healthy Eli Lilly and Company May 2016 Phase 1
NCT02759731 Not yet recruiting Chronic Graft vs Host Disease|Chronic Graft-Versus-Host Disease National Cancer Institute (NCI)|National Institutes of He  ...more National Cancer Institute (NCI)|National Institutes of Health Clinical Center (CC) April 2016 Phase 1|Phase 2
NCT02708095 Recruiting Systemic Lupus Erythematosus Eli Lilly and Company March 2016 Phase 2
NCT02576938 Recruiting Atopic Dermatitis Eli Lilly and Company February 2016 Phase 2
NCT02340104 Completed Healthy Volunteers Eli Lilly and Company January 2015 Phase 1

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Chemical Information

Download Baricitinib (LY3009104, INCB028050) SDF
Molecular Weight (MW) 371.42


CAS No. 1187594-09-7
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms N/A
Solubility (25°C) * In vitro DMSO 74 mg/mL (199.23 mM)
Water <1 mg/mL
Ethanol <1 mg/mL
In vivo 2% DMSO+30% PEG 300+5% Tween 80+ddH2O 5mg/mL
* <1 mg/ml means slightly soluble or 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 Name 3-Azetidineacetonitrile, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]-

Frequently Asked Questions

  • Question 1
    Do you know if S2851 will dissolve directly into 0.5% methylcellulose (vehicle for oral gavage treatments) or is acid required to dissolve it?

    Answer: S2851 dissolve directly into 0.5% methylcellulose, and this is cited from the reference. We also test that dissolve S2851 into 30% PEG400/0.5% Tween80/5% propylene glycol. The solubility is about 30 mg/mL.

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