Cited by 70Pharmacogenetics and Drug MetabolismHormonal Regulation and HypertensionEicosanoids and Hypertension Pharmacology

Aldosterone glucuronidation by human liver and kidney microsomes and recombinant UDP-glucuronosyltransferases: inhibition by NSAIDs

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Knights, Kathleen M., Winner, Leanne K., Elliot, David J., Bowalgaha, Kushari, Miners, John O.·2009·British Journal of Clinical Pharmacology

Abstract

WHAT IS ALREADY KNOWN ABOUT THIS SUBJECT • Carboxylic acid NSAIDs are extensively glucuronidated as either the parent drug or hydroxylated metabolites and UGT2B7 is ranked highest in terms of NSAID‐glucuronidation activity. • NSAIDs cause adverse renal effects including sodium and water retention and hyperkalaemia. • In human kidney the mineralocorticoid aldosterone is glucuronidated directly to form aldosterone 18β‐glucuronide. WHAT THIS STUDY ADDS • Human liver and kidney microsomes and UGT1A10 and UGT2B7 catalyze aldosterone18β‐glucuronidation. • Non‐selective NSAIDs inhibit renal and hepatic aldosterone18β‐glucuronidation andin vivothis may lead to elevated intra‐renal concentrations of this hormone. • Common involvement of UGT2B7 in NSAID and aldosterone glucuronidation predicates an intra‐renal NSAID‐aldosterone interaction that may explain in part the clinical observations of variable effects of NSAIDs on electrolytes, fluid retention and blood pressure. AIMS To characterize: i) the kinetics of aldosterone (ALDO) 18β‐glucuronidation using human liver and human kidney microsomes and identify the human UGT enzyme(s) responsible for ALDO 18β‐glucuronidation and ii) the inhibition of ALDO 18β‐glucuronidation by non‐selective NSAIDs. METHODS Using HPLC and LC‐MS methods, ALDO 18β‐glucuronidation was characterized using human liver (n= 6), human kidney microsomes (n= 5) and recombinant human UGT 1A1, 1A3, 1A4, 1A5, 1A6, 1A7, 1A8, 1A9, 1A10, 2B4, 2B7, 2B10, 2B15, 2B17 and 2B28 as the enzyme sources. Inhibition of ALDO 18β‐glucuronidation was investigated using alclofenac, cicloprofen, diclofenac, diflunisal, fenoprofen,R‐ andS‐ibuprofen, indomethacin, ketoprofen, ketorolac, meclofenamic acid, mefenamic acid,S‐naproxen, pirprofen and tiaprofenic acid. A rank order of inhibition (IC50) was established and the mechanism of inhibition investigated using diclofenac,S‐ibuprofen, indomethacin, mefenamic acid andS‐naproxen. RESULTS ALDO 18β‐glucuronidation by hepatic and renal microsomes exhibited Michaelis‐Menten kinetics. Mean (±SD)Km,Vmaxand CLintvalues for HLM and HKCM were 509 ± 137 and 367 ± 170 µm, 1075 ± 429 and 1110 ± 522 pmol min−1 mg−1, and 2.36 ± 1.12 and 3.91 ± 2.35 µl min−1 mg−1, respectively. Of the UGT proteins, only UGT1A10 and UGT2B7 converted ALDO to its 18β‐glucuronide. All NSAIDs investigated inhibited ALDO 18β‐G formation by HLM, HKCM and UGT2B7. The rank order of inhibition (IC50) of renal and hepatic ALDO 18β‐glucuronidation followed the general trend: fenamates > diclofenac > arylpropionates. CONCLUSION A NSAID‐ALDO interactionin vivomay result in elevated intra‐renal concentrations of ALDO that may contribute to the adverse renal effects of NSAIDs and their effects on antihypertensive drug response.

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Crossref · 10.1111/j.1365-2125.2009.03469.x

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Authors
Knights, K. M., Winner, L. K., Elliot, D. J., Bowalgaha, K., & Miners, J. O.
Affiliations
Flinders University (AU)
Corresponding author
Knights, Kathleen M.
Venue
British Journal of Clinical Pharmacology
Publisher
Wiley
Published
2009-09
Volume
68
Issue
3
Pages
402-412
ISSN
  • 0306-5251 (ISSN-L)
  • 1365-2125
OpenAlex
W2018530877
Cited by
70
References
45
Citations by year
2025: 2 · 2024: 4 · 2023: 8 · 2022: 2 · 2021: 3 · 2020: 5 · 2019: 6 · 2018: 1 · 2017: 4 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 6 · 2012: 9
FWCI
5.68
Type
journal article
Language
en
Open access
Locations
  • British Journal of Clinical Pharmacology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Flinders Academic Commons (Flinders University) (submittedVersion)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal Regulation and Hypertension
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Eicosanoids and Hypertension Pharmacology
Keywords
UDP-glucuronosyltransferase, UGT2B7, UGT1A10, liver microsomes, kidney microsomes, drug-drug interactions, diclofenac, ibuprofen
MeSH terms
Adult, Aged, Aldosterone, Anti-Inflammatory Agents, Non-Steroidal, Chromatography, High Pressure Liquid, Female, Humans, Kidney, Kinetics, Liver, Male, Microsomes, Middle Aged, Glucuronosyltransferase, Inhibitory Concentration 50, Glucuronides

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