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A7019 Sigma-Aldrich

(±)Amethopterin hydrate

≥95%, powder

Synonym: 4-Amino-10-methylfolic acid, DL-4-Amino-N10-methylpteroylglutamic acid, MTX, Methylaminopterin

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Properties

assay   ≥95%
form   powder
color   yellow to yellow with an orange cast
solubility   H2O: insoluble
  NaOH: soluble (minimal amount of 0.1 N NaOH to solubilize, then dilute in neutral buffer or saline)
storage temp.   −20°C
Gene Information   human ... DHFRP1(573971), FPGS(2356), SLC19A1(6573), TYMS(7298)
mouse ... Dhfr(13361)
rat ... Dhfr(24312)

Description

Application

Amethopterin is a folic acid antagonist and potent anticancer agent. Amethopterin blocks DNA synthesis by preventing the production of tetrahydrofolate cofactors which are required to make thymidine. Amethopterin is actively transported into cells by the folate transporter where it is converted to a high molecular weight polyglutamate metabolite by folylpolyglutamate synthase, a dihydrofolate reductase inhibitor.

Biochem/physiol Actions

Amethopterin is a folic acid antagonist and potent anticancer agent. Blocks DNA synthesis by blocking the production of tetrahydrofolate covactors required for the synthesis of thymidine. Amethopterin is actively transported into cells by the folate transporter. In the cell, it is converted to a high molecular weight polyglutamate metabolite by folylpolyglutamate synthase that, in turn, binds to dihydrofolate reductase and inhibits its activity. Amethopterin-polyglutamate is degraded intracellularly by γ-glutamyl hydrolase.

Reconstitution

Add a minimal amount of 0.1 N NaOH to solubilize, then dilute in neutral buffer or saline. Diluted stock is stable for 1 week refrigerated and for 1 month frozen at −20 °C. References: Cell & Tissue Culture: Laboratory Procedures, Chapter 27, Page 27D:3.2 (A. Doyle, et al., eds, John Wiley) and Cell Biology: A Laboratory Handbook, vol. 2, page 417 (Julio E. Celis, ed., Academic Press).

Safety & Documentation

Safety Information

Symbol 
Signal word 
Danger
Hazard statements 
RIDADR 
UN 1544PSN1 6.1 / PGII
WGK Germany 
3
RTECS 
MA1224100

Documents

Certificate of Analysis

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Certificate of Origin

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Protocols & Articles

Articles

DNA Damage and Repair

Damage to cellular DNA is involved in mutagenesis and the development of cancer. The DNA in a human cell undergoes several thousand to a million damaging events per day, generated by both external (e...
Keywords: AGE, Alkylations, Apoptosis, Biochemistry, Cancer, Carcinogens, Catalysis, Clinical, DNA replication, Deaminations, Degradations, Eliminations, Environmental, Enzymology, Gene expression, Genetic, Infrared spectroscopy, Metabolites, Methylations, Mutagens, Oncology, Oxidations, Polymorphisms, Rearrangements, Recombination, Substitutions, Transcription, transformation

Peer-Reviewed Papers
15

References

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