Document Detail

Absorption and Metabolism of Chlorogenic Acids in Cultured Gastric Epithelial Monolayers.
MedLine Citation:
PMID:  21937734     Owner:  NLM     Status:  Publisher    
Gastric absorption of feruloylquinic acid and di-O-caffeoylquinic acid analogs has never been investigated despite their potential contribution to the proposed beneficial health effects leading to reduced risk of type 2 diabetes. Using a cultured gastric epithelial model, with an acidic apical pH, the relative permeability coefficients (P(app)) and metabolic fate of a series of chlorogenic acids (CGAs) were investigated. Mechanistic studies were performed in the apical to basal direction and demonstrated differential rates of absorption for different CGA subgroups. For the first time we show intact absorption of feruloylquinic acids and caffeoylquinic acid lactones across the gastric epithelium (P(app) ~ 0.2 cm/s). Transport appeared to be mainly by passive diffusion, since good linearity was observed over the incubation period and test concentrations, and we speculated that a potential carrier mediated component may be involved in uptake of certain 4-acyl CGA isomers. In contrast, absorption of intact di-O-caffeoylquinic acids was rapid (P(app) ~ 2 to 10 cm/s), but non-linear with respect to time and concentration dependence, which was potentially limited by interaction with an efflux transporter and/or pH gradient dependence. For the first time methylation is shown in gastric mucosa. Furthermore, isoferulic acid, dimethoxycinnamic acid and ferulic acid were identified as novel gastric metabolites of CGA biotransformation. We propose that the stomach is the first location for the release of hydroxycinnamic acids, which could explain their early detection following coffee consumption.
Tracy L Farrell; Tristan P Dew; Laure Poquet; Peter Hanson; Gary Williamson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-21
Journal Detail:
Title:  Drug metabolism and disposition: the biological fate of chemicals     Volume:  -     ISSN:  1521-009X     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9421550     Medline TA:  Drug Metab Dispos     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1 University of Leeds;
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