Leflunomide

Catalog No.S1247 Batch:S124703

Print

Technical Data

Formula

C12H9F3N2O2
Molecular Weight 270.21 CAS No. 75706-12-6
Solubility (25°C)* In vitro DMSO 54 mg/mL (199.84 mM)
Ethanol 54 mg/mL (199.84 mM)
Water Insoluble
In vivo (Add solvents to the product individually and in order)
Homogeneous suspension
CMC-NA
≥5mg/ml Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution
5%DMSO 40%PEG300 5%Tween80 50%ddH2O

Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.

 5.000mg/ml (18.50mM) Taking the 1 mL working solution as an example, add 50 μL of 100 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results. 
Clear solution
5% DMSO 95% Corn oil

Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.

 5.000mg/ml (18.50mM) Taking the 1 mL working solution as an example, add 50 μL of 100 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results. 
* <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.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

Biological Activity

Description Leflunomide is a pyrimidine synthesis and protein tyrosine kinase inhibitor belonging to the DMARD, used as an immunosuppressant agent. The active metabolite of this compound is A77 1726, which inhibits dihydroorotate dehydrogenase (DHODH). This chemical is also an agonist of the AhR.
Targets
Dihydroorotate dehydrogenase [1]
In vitro Leflunomide is actually a prodrug that is processed in vivo to the active metabolite A771726，which has been shown to inhibit proliferation of mononuclear and T-cells. This compound is an inhibitor of several protein tyrosine kinases, with IC50 values between 30 mM and 100 mM in vitro cellular and enzymatic assays. [1] It is capable of inhibiting anti-CD3- and interleukin-2 (IL-2)-stimulated T cell proliferation. This drug is able to inhibit p59fyn and p56lck activity in in vitro tyrosine kinase assays. It also inhibits Ca2+ mobilization in Jurkat cells stimulated by anti-CD3 antibody but not in those stimulated by ionomycin. This compound also inhibits distal events of anti-CD3 monoclonal antibody stimulation, namely, IL-2 production and IL-2 receptor expression on human T lymphocytes. It also inhibits tyrosine phosphorylation in CTLL-4 cells stimulated by IL-2. [2] This immunomodulatory drug may exert its effects by inhibiting the mitochondrial enzyme dihydroorotate dehydrogenase (DHODH), which plays a key role in the de novo synthesis of the pyrimidine ribonucleotide uridine monophosphate (rUMP). It prevents the expansion of activated and autoimmune lymphocytes by interfering with the cell cycle progression due to inadequate production of rUMP and utilizing mechanisms involving p53. [3]
In vivo Leflunomide is able to prevent and reverse allograft and xenograft rejection in rodents, dogs, and monkeys. [2]

Protocol (from reference)

References

  • https://pubmed.ncbi.nlm.nih.gov/8573583/
  • https://pubmed.ncbi.nlm.nih.gov/7759480/
  • https://pubmed.ncbi.nlm.nih.gov/10600330/
  • https://pubmed.ncbi.nlm.nih.gov/16904479/

Customer Product Validation

<p>Peritoneal macrophages were pretreated for 1 h with the leflunomide (100 umol/L), followed by treatment with 10 ug/ml rTsP53 for 6 h. Western blot analysis of P-STAT6 and STAT6 expression was performed. Corresponding staining for b-actin was carried out to control for equal loading. *P < 0.05 versus control group, <sup>#</sup>P < 0.05 versus rTsP53 group.</p>

Data from [ Cell Immunol , 2014 , 288(1-2), 1-7 ]

<p>Peritoneal macrophages were stained for FITC-MR. Flow cytometry analysis of MFI. The result for one representative of three independent experiments is shown.</p>

Data from [ Cell Immunol , 2014 , 288(1-2), 1-7 ]

<p>We found that the expression of Arg1, Ym1 and IL-10 on peritoneal macrophages incubated with leflunomide and rTsP53 were significantly down-regulated in comparison to treatment with rTsP53 alone.</p>

Data from [ Cell Immunol , 2014 , 288(1-2), 1-7 ]

H1299, H460, A549 cells were treated with leflunomide or teriflunomide at indicated concentrations for 24 h.

Data from [ , , Toxicol Lett, 2018, ]

Selleck's Leflunomide Has Been Cited by 21 Publications

Proteogenomic characterization of non-functional pancreatic neuroendocrine tumors unravels clinically relevant subgroups [ Cancer Cell, 2025, 43(4):776-796.e14] PubMed: 40185092
Targeting the MARCH5-MFN2 axis to enhance mitochondrial fusion and sensitize multiple myeloma cells to venetoclax [ J Transl Med, 2025, 23(1):917] PubMed: 40814067
Vaccinia growth factor-dependent modulation of the mTORC1-CAD axis upon nutrient restriction [ J Virol, 2025, 99(2):e0211024] PubMed: 39817770
Coronavirus envelope protein activates TMED10-mediated unconventional secretion of inflammatory factors [ Nat Commun, 2024, 15(1):8708] PubMed: 39379362
Role of vaccinia virus growth factor in stimulating the mTORC1-CAD axis of the de novo pyrimidine pathway under different nutritional cues [ bioRxiv, 2024, 2024.07.02.601567] PubMed: 39005450
IDH2 stabilizes HIF-1α-induced metabolic reprogramming and promotes chemoresistance in urothelial cancer [ EMBO J, 2023, e110620.] PubMed: 36637036
Role of mitochondrial fusion proteins MFN2 and OPA1 on lung cellular senescence in chronic obstructive pulmonary disease [ Respir Res, 2023, 24(1):319] PubMed: 38110986
Dihydroorotate dehydrogenase promotes cell proliferation and suppresses cell death in esophageal squamous cell carcinoma and colorectal carcinoma [ Transl Cancer Res, 2023, 12(9):2294-2307] PubMed: 37859742
Dihydroorotate dehydrogenase promotes cell proliferation and suppresses cell death in esophageal squamous cell carcinoma and colorectal carcinoma [ Transl Cancer Res, 2023, 12(9):2294-2307] PubMed: 37859742
De novo pyrimidine synthesis fuels glycolysis and confers chemoresistance in gastric cancer [ Cancer Lett, 2022, S0304-3835(22)00321-4] PubMed: 35921972

RETURN POLICY
Selleck Chemical’s Unconditional Return Policy ensures a smooth online shopping experience for our customers. If you are in any way unsatisfied with your purchase, you may return any item(s) within 7 days of receiving it. In the event of product quality issues, either protocol related or product related problems, you may return any item(s) within 365 days from the original purchase date. Please follow the instructions below when returning products.

SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

NOT FOR HUMAN, VETERINARY DIAGNOSTIC OR THERAPEUTIC USE.