title: Methylenetetrahydrofolate reductase and reduced folate carrier-1 genotypes and methotrexate serum concentrations in patients with rheumatoid arthritis.
abstract: We investigated the genotypes of methylenetetrahydrofolate reductase (MTHFR) and reduced folate carrier-1 (RFC-1), and the serum concentrations of methotrexate (MTX) in 100 outpatients with rheumatoid arthritis (RA). Frequencies of MTHFR C677T and A1298C were similar to those reported in Japanese RA patients, while frequencies of RFC-1 G80A genotypes differed from those reported in RA patients in the United States. No correlations were found between these genotypes and serum MTX levels.
authors.affiliation: Department of Geriatric Pharmacology and Therapeutics, Graduate School of Pharmaceutical Sciences, Chiba University, Japan.
authors.forename: Katsumi
authors.initials: K
authors.lastname: Fukino
authors.forename: Tomoe
authors.initials: T
authors.lastname: Kawashima
authors.forename: Masahiko
authors.initials: M
authors.lastname: Suzuki
authors.forename: Koichi
authors.initials: K
authors.lastname: Ueno
mesh_terms: D018501:Antirheumatic Agents / Q000097:blood* / Q000493:pharmacokinetics / Q000627:therapeutic use; D001172:Arthritis, Rheumatoid / Q000188:drug therapy* / Q000201:enzymology / Q000235:genetics; D016009:Chi-Square Distribution; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D026901:Membrane Transport Proteins / Q000235:genetics*; D008727:Methotrexate / Q000097:blood* / Q000493:pharmacokinetics / Q000627:therapeutic use; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008875:Middle Aged
chemical_list: D018501:Antirheumatic Agents; D026901:Membrane Transport Proteins; C120043:SLC19A2 protein, human; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D008727:Methotrexate