Tofacitinib (CP-690550) Citrate
For research use only.
Licensed by Pfizer Catalog No.S5001
CAS No. 540737-29-9
Tofacitinib citrate (CP-690550 citrate) 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.
Selleck's Tofacitinib (CP-690550) Citrate has been cited by 125 publications
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|Description||Tofacitinib citrate (CP-690550 citrate) 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 citrate inhibits IL-2-mediated human T cell blast proliferation and IL-15-induced CD69 expression with IC50 of 11 nM and 48 nM, respectively. Tofacitinib citrate prevents mixed lymphocyte reaction with IC50 of 87 nM. Tofacitinib citrate treatment of murine factor-dependent cell Patersen–erythropoietin receptor (FDCP-EpoR) cells harboring human wild-type or V617F JAK2 leads to prevention of cell proliferation with IC50 of 2.1 µM and 0.25 µM, respectively. Tofacitinib citrate inhibits interleukin-6-induced phosphorylation of STAT1 and STAT3 with IC50 of 23 nM and 77 nM, respectively. Moreover, Tofacitinib citrate generates a significant pro-apoptotic effect on murine FDCP-EpoR cells carrying JAK2VV617F, whereas a lesser effect is observed for cells carrying wild-type JAK2. This activity is coupled with the inhibition of phosphorylation of the key JAK2V617F-dependent downstream signaling effectors signal transducer and activator of transcription (STAT)3, STAT5, and v-akt murine thymoma viral oncogene homolog (AKT).  Additionally, Tofacitinib citrate prevents IL-15-induced CD69 expression in human and cynomolgus monkey NK and CD8+ T cells in vitro. 
|In vivo||Tofacitinib citrate decrease a delayed-type hyper-sensitivity response and extended cardiac allograft survival in murine models. Furthermore, Tofacitinib citrate treatment of ex-vivo-expanded erythroid progenitors from JAK2V617F-positive PV patients results in specific, antiproliferative (IC50 = 0.2 μM) and pro-apoptotic activity. In contrast, expanded progenitors from healthy controls are less sensitive to Tofacitinib citrate in proliferation (IC50 > 1.0 μM), and apoptosis assays. During 2 weeks of Tofacitinib citrate dosing at 10 and 30 mg/kg/d, a significant, time-dependent decrease in NK cell numbers relative to vehicle treatment is observed. Effector memory CD8+ cell numbers in the Tofacitinib citrate-treated group are 55% less than those observed in animals treated with vehicle.|
Enzyme assays:The JAK1, JAK2, and JAK3 kinase assays utilize a protein expressed in baculovirus-infected SF9 cells (a fusion protein of GST and the catalytic domain of human JAK enzyme) purified by affinity chromatography on glutathione−Sepharose. The substrate for the reaction is polyglutamic acid-tyrosine [PGT (4:1)], coated onto Nunc Maxi Sorp plates at 100 μg/mL overnight at 37 °C. The plates are washed three times, and JAK enzyme is added to the wells, which contained 100 μL of kinase buffer (50 mM HEPES, pH 7.3, 125 mM NaCl, 24 mM MgCl2) + ATP + 1 mM sodium orthovanadate). For Tofacitinib citrate, it is also added for kinase assay at different doses. After incubation at room temperature for 30 min, the plates are washed three times. The level of phosphorylated tyrosine in a given well is determined by standard ELISA assay utilizing an anti-phosphotyrosine antibody.
|In vitro||DMSO||100 mg/mL warmed (198.21 mM)|
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Clinical Trial Information
|NCT Number||Recruitment||interventions||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT04468425||Not yet recruiting||Drug: Tofacitinib Citrate||Healthy Subjects||TWi Biotechnology Inc.||November 11 2020||Phase 1|
|NCT04496960||Not yet recruiting||Drug: tofacitinib|Other: Placebo||Sjogren''s Syndrome||National Institute of Dental and Craniofacial Research (NIDCR)|National Institutes of Health Clinical Center (CC)||September 3 2020||Phase 1|Phase 2|
|NCT04424303||Not yet recruiting||Drug: Tofacitinib||Ulcerative Colitis||Pfizer||September 30 2020||--|
|NCT04141904||Recruiting||Drug: Tofacitinib 5 MG [Xeljanz]|Other: Placebo||Depression|Inflammation||University of Oxford|Wellcome Trust|Medical Research Council||November 2019||Phase 1|Phase 2|
|NCT04111614||Completed||Drug: Tofacitinib tablet|Drug: Tofacitinib Oral Solution||Healthy||Pfizer||October 11 2019||Phase 1|
|NCT03681275||Recruiting||Drug: Tofacitinib 5 mg|Drug: Placebo to match Tofacitinib||Diaphragm Injury||Stanford University||September 3 2019||Phase 2|
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Frequently Asked Questions
What is the difference between the two products (S5001, S2789)?
Tofacitinib (S2789) is the base form of Tofacitinib citrate (S5001). The biological activity of these two compound are same. S5001 is better than S2789 for Oral gavage.