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Transport mechanism and metabolism of olive oil hydroxytyrosol in Caco‐2 cells
Author(s) -
Manna Caterina,
Galletti Patrizia,
Maisto Giovanna,
Cucciolla Valeria,
D'Angelo Stefania,
Zappia Vincenzo
Publication year - 2000
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(00)01350-8
Subject(s) - hydroxytyrosol , chemistry , caco 2 , metabolite , bioavailability , metabolism , catechol , biochemistry , olive oil , enzyme , in vitro , antioxidant , xenobiotic , food science , polyphenol , biology , pharmacology
3,4‐Dihydroxyphenylethanol (hydroxytyrosol; DPE) is the major phenolic antioxidant present in extra virgin olive oil, either in a free or esterified form. Despite its relevant biological effects, no data are available on its bioavailability and metabolism. The aim of the present study is to examine the molecular mechanism of DPE intestinal transport, using differentiated Caco‐2 cell monolayers as the model system. The kinetic data demonstrate that [ 14 C]DPE transport occurs via a passive diffusion mechanism and is bidirectional; the calculated apparent permeability coefficient indicates that the molecule is quantitatively absorbed at the intestinal level. The only labelled DPE metabolite detectable in the culture medium by HPLC (10% conversion) is 3‐hydroxy‐4‐methoxyphenylethanol, the product of catechol‐ O ‐methyltransferase; when DPE is assayed in vitro with the purified enzyme a K m value of 40 μM has been calculated.