Monday, 9 May 2016

Inhibitory action of Epilobium hirsutum extract and its constituent ellagic acid on drug-metabolizing enzymes

Volume 41, Issue 2, 1 April 2016, Pages 109-116


a  Department of Biology, Pamukkale University, Kinikli-Denizli, Turkey
b  Department of Biechemistry, Faculty of Science, Selcuk University, Selcuklu, Konya, Turkey
c  Department of Pharmaceutical Botany, Faculty of Pharmacy, Ankara University, Ankara, Turkey 

Abstract

Epilobium hirsutum (EH) is a medicinal plant for treating various diseases. Despite its wide usage, there is no available information about its potential influences on drug metabolism. The present study was undertaken to determine the in vivo effects of EH on hepatic CYP2B, CYP2C, CYP2D, and CYP3A enzymes that are primarily involved in drug metabolism. Male Wistar rats were injected intraperitoneally with EH water extract (EHWE) and ellagic acid (EA) at a daily dose of 37.5 and 20 mg/kg, respectively, for 9 days and hepatic drug-metabolizing enzymes were assessed at activity, protein and mRNA levels. Erythromycin N-demethylase activity was inhibited by 53 and 21 % in EHWE- and EA-treated rats, respectively. Benzphetamine N-demethylase and 7-benzyloxyresorufin-O-debenzylase activities were decreased by 53 and 43 %, and 57 and 57 % in EHWE-and EA-treated rats, respectively. Moreover, protein levels of CYP2B1, CYP2C6, CYP2D2, and CYP3A1 also decreased by 55, 15, 33, and 82 % as a result of EHWE treatment of rats, respectively. Similarly, CYP2B1, CYP2C6, CYP2D2, and CYP3A1 protein levels decreased by 62, 63, 49, and 37 % with EA treatment, respectively. qRT-PCR analyses also showed that mRNA levels of these enzymes were significantly inhibited with bothEHWE and EA treatments. In conclusion, inhibition of drug clearances leading to drug toxicity because of the lowered activity and expression of drug-metabolizing enzymes might be observed in the people who used EH as complementary herbal remedy that might be contributed by its EA content. © 2014 Springer International Publishing Switzerland.

Author keywords

CYP2B1; CYP2C6; CYP2D2; CYP3A1; Drug-metabolizing enzymes; Ellagic acid; Epilobium hirsutum; Inhibition, drug-herb interaction
ISSN: 03787966 CODEN: EJDPDSource Type: Journal Original language: English
DOI: 10.1007/s13318-014-0238-1Document Type: Article
Publisher: Springer-Verlag France
  Sen, A.; Department of Biology, Pamukkale University, Turkey; email:sena@pau.edu.tr
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