Inhibition of cytochrome P450 activities by extracts of 'Hyptis verticillata' Jacq. : assessment for potential HERB-drug interactions

Picking, David, Chambers, Bentley, Barker, James, Shah, Iltaf, Porter, Roy, Naughton, Declan P and Delgoda, Rupika (2018) Inhibition of cytochrome P450 activities by extracts of 'Hyptis verticillata' Jacq. : assessment for potential HERB-drug interactions. Molecules, 23(2), p. 430. ISSN (online) 1420-3049

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Abstract

Understanding the potential for adverse drug reactions (ADRs), from herb-drug interactions, is a key aspect of medicinal plant safety, with particular relevance for public health in countries where medicinal plant use is highly prevalent. We undertook an in-depth assessment of extracts of Hyptis verticillata Jacq., via its impact on activities of key cytochrome P450 (CYP) enzymes (CYPs 1A1, 1A2, 1B1, 3A4 and 2D6), its antioxidant properties (determined by DPPH assays) and chemical characterisation (using LC-MS). The dried plant aqueous extract demonstrated potent inhibition of the activities of CYPs 1A1 (7.6 µg/mL), 1A2 (1.9 µg/mL), 1B1 (9.4 µg/mL) and 3A4 (6.8 µg/mL). Further analysis of other crude extracts demonstrated potent inhibition of CYP1A2 activity for a dried plant ethanol extract (1.5 µg/mL), fresh plant ethanol extract (3.9 µg/mL), and moderate activity for a fresh plant aqueous extract (27.8 µg/mL). All four extracts demonstrated strong antioxidant activity, compared to the positive control (ascorbic acid, 1.3 µg/mL), with the dried plant ethanol extract being the most potent (1.6 µg/mL). Analysis of the dried plant aqueous extract confirmed the identity of seven phytochemicals, five lignans and two triterpenes. Individual screening of these phytochemicals against the activity of CYP1A2 identified yatein as a moderate inhibitor (71.9 μM), likely to contribute to the plant extract’s potent bioactivity. Further analysis on the impact of this plant on key drug metabolizing enzymes in vivo appears warranted for likely ADRs, as well as furthering development as a potential chemopreventive agent.

Item Type: Article
Research Area: Allied health professions and studies
Faculty, School or Research Centre: Faculty of Science, Engineering and Computing (until 2017)
Faculty of Science, Engineering and Computing (until 2017) > School of Life Sciences
Faculty of Science, Engineering and Computing (until 2017) > School of Pharmacy and Chemistry
Depositing User: Declan Naughton
Date Deposited: 16 Feb 2018 16:27
Last Modified: 16 Feb 2018 16:27
DOI: https://doi.org/10.3390/molecules23020430
URI: http://eprints.kingston.ac.uk/id/eprint/40680

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