SKU: M031  / 
    CAS Number: 7413-34-5

    Methotrexate Sodium


    Methotrexate Sodium is a selective agent for dihydrofolate reductase (DHFR)- transfected cells and a nucleic acid synthesis inhibitor in protein expression systems. It is commonly used as an ancillary material in upstream biomanufacturing applications. It also has immunosuppressive effects for rheumatoid arthritis research and has anti-cancer properties. Methotrexate sodium is freely soluble in aqueous solution.

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    • Methotrexate (M027)

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    Mechanism of Action Methotrexate acts as an allosteric inhibitor of dihydrofolate reductase (DHFR), an enzyme involved in the folic acid metabolic pathway. Folic acid is essential in cells because it is required for thymidine and purine synthesis. Methotrexate therefore acts as a nucleic acid synthesis inhibitor.
    Impurity Profile Impurity A| (2,4-Diaminopteridin-6-yl)methanol Hydrochloride|945-24-4|C7H8N6O|192.18| Impurity B| (2S)-2-[[4-[[(2,4-diaminopteridin-6-yl)methyl]amino]benzoyl]amino]pentanedioic acid; N-Desmethyl Methotrexate|54-62-6|C19H20N8O5|440.41| Impurity C| (2S)-2-[[4-[[(2-amino-4-hydroxy pteridin-6-yl) methyl] methyl amino] benzoyl] amino] pentanedioic acid ; Methotrextae 4-Oxo Analog |2410-93-7|C20H21N7O6|455.42| Impurity D| 4-[[(2-amino-4-hydroxypteridin-6-yl)methyl] methylamino]benzoic acid; N10-Methylpteroic acid|5623-18-7|C15H14N6O3|326.31| Impurity E| 4-[[(2,4-Diaminopteridin-6-yl) methyl] methyl amino]benzoic acid; 2,4-Diamino-N10-methylpterioc acid|70844-48-3|C15H15N7O2|325.33| Impurity F| (2R)-2-[[4-[[(2,4-Diaminopteridin-6-yl)methyl]methylamino]benzoyl] amino] pentanedioic acid ; (R)-Methotrexate||C20H22N8O5|454.44| Methotrexate Dimethyl Ester| N-[4-[[(2,4-Diamino-6-pteridinyl)methyl]methylamino]benzoyl]-L-glutamic acid dimethyl ester; Dimethyl Methotrexate|34378-65-9|||7-Hydroxy Methotrexate|4-Amino-7-hydroxy-10-methylpteroylglutamic acid|5939-37-7|C20H22N8O6|470.44|
    Eukaryotic Cell Culture Applications Methotrexate is commonly used in the dihydrofolate reductase (DHFR) selection system as a selection antibiotic to select for DHFR- deficient cells (ie CHO) that have been transfected with DHFR genes. Methotrexate inhibits the activity of DHFR; however, cells that overproduce DHFR can tolerate higher concentrations of Methotrexate. In most cases, overproducing DHFR cells produce more recombinant protein than lower DHFR producing cells.

    Mammalian cells used in biopharma manufacturing may exhibit toxicity to USP-grade products. Methotrexate, EvoPure® has been purified to remove toxic impurities. If you have unique specifications for your system, please contact us.

    Cancer Applications Methotrexate Sodium acts as a chemotherapeutic agent by inhibiting nucleic acid synthesis in cancer cells.
    Insect Biology Applications Methotrexate is effective for pyrimethamine-resistant Plasmodium vivax malaria parasites.
    Molecular Formula C20H20N8Na2O5

    Fairbanks, LD et al (1999)  Methotrexate inhibits the first committed step of purine biosynthesis in mitogen-stimulated human T-lymphocytes: A metabolic basis for efficacy in rheumatoid arthritis? Biochem. J 342 (1):143-52

    Kingston RE, Kaufman RJ, Bebbington CR and Rolfe MR (2002)  Amplification using CHO cell expression vectors. Curr. Protoc. Mol. Biol. Chapter 16:Unit 16.23  PMID 18265304

    Maleki H et al (2017)  Methotrexate-loaded PLGA nanoparticles: Preparation, characterization and their cytotoxicity effect on human glioblastoma U87MG cells. Med. Nano. Res. 4(1):020