title: Identification of 10-formyltetrahydrofolate, tetrahydrofolate and 5-methyltetrahydrofolate as major reduced folate derivatives in rat bile.
abstract: Reduced folate derivatives in rat bile were examined using high-performance liquid chromatography with electrochemical detection (HPLC-ED). Three peaks of folate compounds were observed on the chromatograms. From the retention-time profiles and hydrodynamic voltammograms, and the profiles of ultraviolet (UV) absorbance spectra obtained by HPLC with photodiode array detection, these 3 peaks were identified as 10-formyltetrahydrofolate (10-HCO-H4PteGlu), tetrahydrofolate (H4PteGlu) and 5-methyltetrahydrofolate (5-CH3-H4PteGlu). The rates of bile secretion of 10-HCO-H4PteGlu, H4PteGlu and 5-CH3H4PteGlu were 314 +/- 181, 321 +/- 179 and 449 +/- 198 ng/h (mean +/- S.D.), respectively. 10-HCO-H4PteGlu and H4PteGlu together wtih 5-CH3-H4-PteGlu are found to be the major folate derivatives in rat bile. The nonmethylated folates, 10-HCO-H4PteGlu and H4PteGlu, may also play an important role in folate homeostasis.
authors.affiliation: Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Japan.
authors.forename: H C
authors.initials: HC
authors.lastname: Shin
authors.forename: M
authors.initials: M
authors.lastname: Shimoda
authors.forename: E
authors.initials: E
authors.lastname: Kokue
authors.forename: Y
authors.initials: Y
authors.lastname: Takahashi
mesh_terms: D000818:Animals; D001646:Bile / Q000737:chemistry* / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D005492:Folic Acid / Q000378:metabolism / Q000493:pharmacokinetics; D006863:Hydrogen-Ion Concentration; D002955:Leucovorin / Q000031:analogs & derivatives* / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D013056:Spectrophotometry, Ultraviolet; D013763:Tetrahydrofolates / Q000032:analysis*; D014316:Tritium
chemical_list: D013763:Tetrahydrofolates; D014316:Tritium; C010161:10-formyltetrahydropteroylglutamic acid; C030371:5,6,7,8-tetrahydrofolic acid; D005492:Folic Acid; D002955:Leucovorin; C005984:5-methyltetrahydrofolate