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Title: Inhibition of intestinal metabolism of the antiviral ester prodrug bis(POC)-PMPA by nature-identical fruit extracts as a strategy to enhance its oral absorption: an in vitro study
Authors: Van Gelder, Jan ×
Annaert, Pieter
Naesens, Lieve
De Clercq, Erik
Van den Mooter, Guy
Kinget, Renaat
Augustijns, Patrick #
Issue Date: Jul-1999
Publisher: Kluwer academic/Plenum publishing corporation
Series Title: Pharmaceutical Research vol:16 issue:7 pages:1035-1040
Abstract: PURPOSE: To explore the usefulness of fruit extracts as enhancers of the oral absorption of esterase-sensitive prodrugs. METHODS: Inhibition of esterase-mediated degradation by nature-identical fruit extracts was evaluated using 1) p-nitrophenylacetate (model substrate for esterase-activity) in rat intestinal homogenates and 2) bis(isopropyloxycarbonyloxymethyl)-(R)-9-[(2-phosphonomethoxy++ +)propyl]adenine [bis(POC)-PMPA] (esterase-sensitive prodrug of the antiviral agent PMPA) in Caco-2 cell homogenates and in intestinal homogenates from rat, pig and man. Subsequently, transport of the ester prodrug was studied across Caco-2 monolayers in the presence or absence of fruit extracts. RESULTS: In homogenates from rat ileum, the esterase activity could be reduced significantly by the inclusion of fruit extracts (1%): the initial enzymatic degradation of p-nitrophenylacetate was inhibited by 77% (strawberry), 16% (passion fruit) and 57% (banana). A similar inhibition of bis(POC)-PMPA metabolism by fruit extracts was observed in intestinal homogenates from several species and in homogenates from Caco-2 cells. Transport of total PMPA across Caco-2 monolayers was enhanced 3-fold by co-incubation with strawberry extract (1%). The fraction of intact prodrug appearing in the acceptor compartment increased from virtually zero to 67%. CONCLUSIONS: The results suggest that co-incubation with nature-identical fruit extracts might be useful as a strategy to enhance the transepithelial transport of esterase-sensitive prodrugs through inhibition of intracellular metabolism of the prodrug.
URI: 
ISSN: 0724-8741
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Drug Delivery and Disposition
Laboratory of Virology and Chemotherapy (Rega Institute)
× corresponding author
# (joint) last author

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