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01.02.2016 | Original Contribution

Influence of diet supplementation with green tea extract on drug-metabolizing enzymes in a mouse model of monosodium glutamate-induced obesity

verfasst von: Iva Boušová, Petra Matoušková, Hana Bártíková, Barbora Szotáková, Veronika Hanušová, Veronika Tománková, Eva Anzenbacherová, Barbora Lišková, Pavel Anzenbacher, Lenka Skálová

Erschienen in: European Journal of Nutrition | Ausgabe 1/2016

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Abstract

Purpose

Consumption of dietary supplements with green tea extract (GTE) is popular for weight management, but it may be accompanied by various side effects, including interactions with drugs. The aim of the present in vivo study was to evaluate the effect of defined GTE (Polyphenon 60) in three dosage schemes on insulin, leptin and drug-metabolizing enzymes in obese mice.

Methods

Experimental obesity was induced by repeated s.c. application of monosodium glutamate to newborn mice. Green tea extract was administered in three dosage schemes in chow diet. The plasmatic levels of insulin and leptin were assayed using enzyme-linked immunosorbent assay. Enzyme activities and mRNA expressions of drug-metabolizing enzymes (totally 13) were analyzed in liver and small intestine using spectrophotometric and HPLC assays and RT-PCR, respectively.

Results

GTE-treatment decreased insulin and leptin levels. Eleven enzymes were significantly affected by GTE-treatment. Long-term administration of 0.01 % GTE caused increase in the activity and mRNA level of cytochrome P450 3A4 (CYP3A4) ortholog in the liver as well as in the small intestine. Interestingly, short-term overdose by GTE (0.1 %) had more pronounced effects on enzyme activities and mRNA expressions than long-term overdose.

Conclusions

GTE-mediated induction of CYP3A4 ortholog, the main drug-metabolizing enzyme, could result in decreased efficacy of simultaneously or subsequently administered drug in obese individuals.

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Titel: Influence of diet supplementation with green tea extract on drug-metabolizing enzymes in a mouse model of monosodium glutamate-induced obesity
verfasst von: Iva Boušová
Petra Matoušková
Hana Bártíková
Barbora Szotáková
Veronika Hanušová
Veronika Tománková
Eva Anzenbacherová
Barbora Lišková
Pavel Anzenbacher
Lenka Skálová
Publikationsdatum: 01.02.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Nutrition / Ausgabe 1/2016
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI: https://doi.org/10.1007/s00394-015-0856-7

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