title: Transport of high concentration of thiamin, riboflavin and pyridoxine across intestinal epithelial cells Caco-2.
abstract: In this study, we examined the intestinal uptake of thiamin (vitamin B(1)), riboflavin (vitamin B(2)) and pyridoxine (vitamin B(6)) administered at high concentration using intestinal epithelial Caco-2 cells as an in vitro model of drugs and food absorption. The effect of vitamin concentration, culture age, transport direction and incubation temperature on vitamin transport was determined. The vitamin transport was expressed as an apparent permeability coefficient and changes in cumulative fraction transported across epithelial membrane in time. It was found that transepithelial transport of these vitamins is dependent on the experimental factors. At low concentrations an active transport mechanism was observed, whereas at high vitamin concentration a passive transport dominated. At high vitamin concentration the transepithelial flux of vitamins in both directions was similar, which proves the mechanism of passive transport.
authors.affiliation: Department of Biotechnology and Food Microbiology, University of Life Sciences in Poznan. mzd@owl.au.poznan.pl
authors.forename: Magdalena
authors.initials: M
authors.lastname: Zielińska-Dawidziak
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Grajek
authors.forename: Anna
authors.initials: A
authors.lastname: Olejnik
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Czaczyk
authors.forename: Wlodzimierz
authors.initials: W
authors.lastname: Grajek
mesh_terms: D000704:Analysis of Variance; D001692:Biological Transport / Q000502:physiology; D001693:Biological Transport, Active / Q000502:physiology; D018938:Caco-2 Cells; D004305:Dose-Response Relationship, Drug; D004848:Epithelium / Q000502:physiology; D006801:Humans; D007408:Intestinal Absorption / Q000502:physiology*; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000502:physiology; D011736:Pyridoxine / Q000493:pharmacokinetics; D012256:Riboflavin / Q000493:pharmacokinetics; D013831:Thiamine / Q000493:pharmacokinetics; D014803:Vitamin B Complex / Q000009:adverse effects / Q000493:pharmacokinetics*
chemical_list: D014803:Vitamin B Complex; D011736:Pyridoxine; D012256:Riboflavin; D013831:Thiamine