1、Hotline: 400-820-3792Inhibitors Agonists Screening Librarieswww.MedChemELeflunomideCat. No.: HY-B0083CAS No.: 75706-12-6Synonyms: HWA486; RS-34821; SU101分式: CHFNO分量: 270.21作靶點: Others作通路: Others儲存式: Powder -20C 3 years4C 2 yearsIn solvent -80C 6 months-20C 1 month溶解性數據體外實驗 DMSO : 50 mg/mL (185.04 mM

2、)Methanol : 2 mg/mL (7.40 mM; Need ultrasonic and warming)* means soluble, but saturation unknown.Mass Solvent1 mg 5 mg 10 mg Concentration制備儲備液1 mM 3.7008 mL 18.5041 mL 37.0083 mL5 mM 0.7402 mL 3.7008 mL 7.4017 mL10 mM 0.3701 mL 1.8504 mL 3.7008 mL請根據產品在不同溶劑中的溶解度，選擇合適的溶劑配制儲備液，并請注意儲備液的保存式和期限。體內實驗請根據

3、您的實驗動物和給藥式選擇適當的溶解案，配制前請先配制澄清的儲備液，再依次添加助溶劑(為保證實驗結果的可靠性，體內實驗的作液，建議您現現配，當天使；澄清的儲備液可以根據儲存條件，適當保存；以下溶劑前的百分 指該溶劑在您配制終溶液中的體積占)：1. 請依序添加每種溶劑： 10% DMSO 40% PEG300 5% Tween-80 45% salineSolubility: 2.5 mg/mL (9.25 mM); Suspended solution; Need ultrasonic and warming2. 請依序添加每種溶劑： 10% DMSO 90% (20% SBE-CD in sa

4、line)1/3 Master of Small Molecules 您邊的抑制劑師www.MedChemESolubility: 2.5 mg/mL (9.25 mM); Clear solution3. 請依序添加每種溶劑： 10% DMSO 90% corn oilSolubility: 2.5 mg/mL (9.25 mM); Clear solutionBIOLOGICAL ACTIVITY物活性 Leflunomide種嘧啶合成抑制劑，通過抑制氫乳 酸脫氫酶 (dihydroorotate dehydrogenase) 起作，具有抗風濕的作。體外研究 Leflunomide is

5、actually a prodrug that has been shown to inhibit proliferation of mononuclear and T-cells.Leflunomide is an inhibitor of several protein tyrosine kinases, with IC50 values between 30 mM and 100 mMin vitro cellular and enzymatic assays 1. Leflunomide is capable of inhibiting anti-CD3- and interleuki

6、n-2 (IL-2)-stimulated T cell proliferation. Leflunomide is able to inhibit p59fyn and p56lck activity in in vitro tyrosinekinase assays. Leflunomide also inhibits Ca2+ mobilization in Jurkat cells stimulated by anti-CD3 antibodybut not in those stimulated by ionomycin. Leflunomide also inhibits dist

7、al events of anti-CD3 monoclonalantibody stimulation, namely, IL-2 production and IL-2 receptor expression on human T lymphocytes.Leflunomide also inhibits tyrosine phosphorylation in CTLL-4 cells stimulated by IL-2 2. Leflunomide is animmunomodulatory drug that may exert its effects by inhibiting t

8、he mitochondrial enzyme dihydroorotatedehydrogenase (DHODH), which plays a key role in the de novo synthesis of the pyrimidine ribonucleotideuridine monophosphate (rUMP). Leflunomide prevents the expansion of activated and autoimmunelymphocytes by interfering with the cell cycle progression due to i

9、nadequate production of rUMP and utilizingmechanisms involving p53 3.PROTOCOLKinase Assay 1 DHODase activity is measured by the DCIP colorimetric assay. This is a coupled assay in which oxidation ofDHO and subsequent reduction of ubiquinone are stoichiometrically equivalent to the reduction of DCIP.

10、Reduction of DCIP is accompanied by a loss of absorbance at 610 nm (=21500 M/cm). The assay isperformed in a 96-well microtiter plate at ambient temperature (ca. 25C). Stock solutions of 10 mMleflunomide and A771726 are prepared in dimethyl sulfoxide (DMSO) and these are diluted with reactionbuffer

11、(100 mM Tris and 0.1 % Triton X-100, pH 8.0) to prepare working stocks of the inhibitors at varyingconcentrations. For each reaction, the well contained 10 nM DHODase, 68 M DCIP, 0.16 mg/mL gelatin, thestated concentration of ubiquinone, 10 L of an inhibitor working stock to give the stated final co

12、ncentration,and reaction buffer. After a 5-min equilibration period, the reaction is initiated by addition of DHO to thestated final concentrations. The total volume of reaction mixture for each assay is 150 L, and the finalDMSO concentration is 0.01% (v/v). The reaction progress is followed by reco

13、rding the loss of absorbanceat 610 nm over a 10-min period (during which the velocity remained linear). Velocities are reported as thechange in absorbance at 610 nm per minute, and each reported value is the average of three replicates. Inexperiments where the DHO or ubiquinone concentration is vari

14、ed, the other substrate is held constant at200 M. To determine the inhibitor potency of leflunomide and A771726, the effects of varying concentrationsof the two compounds on the initial velocity of the DHODase reaction is measured over a concentrationrange of 0.011.0 M. In these experiments the DHO

15、and ubiquinone concentrations are held constant at2/3 Master of Small Molecules 您邊的抑制劑師www.MedChemE200 and 100 M, respectively.MCE has not independently confirmed the accuracy of these methods. They are for reference only.戶使本產品發表的科研獻 Haematologica. 2018 Sep;103(9):1472-1483. Cancer Lett. 2018 Mar 28

16、;417:21-34. Harvard Medical School LINCS LIBRARYSee more customer validations on HYPERLINK / www.MedChemEREFERENCES1. Davis JP, et al. The immunosuppressive metabolite of leflunomide is a potent inhibitor of human dihydroorotate dehydrogenase.Biochemistry. 1996 Jan 30;35(4):1270-3.2. Xu X, et al. Inhibition of protein tyrosine phosphorylation in T cells by a novel immunosuppressive agent, leflunomide. J Biol Chem. 1995May 26;270(21):12398-403.3. Fox RI, et al. Mechanism of action for leflunomide in rheumato