Tea is one of the most frequently consumed beverages in the world, second only to water. Epidemiological studies have associated the consumption of green tea with a lower risk of several types of cancers, including stomach, oral cavity, esophagus, and lung. This paper deals with the mechanism of action of tea as an effective chemopreventive agent for toxic chemicals and especially carcinogens. UDP-glucuronosyltransferase (UDP-GT) activities towards p-nitrophenol were markedly increased (51.8% or 1.5-fold) in rats that consumed tea compared with the control animals on water. Induction of UDP-glucuronosyltransferase activity by tea may involve the UDP-GT1 (UGT1A) gene complex of the UDP-GT multigene family. Therefore, a major mechanism of tea as a chemopreventive agent is induction of the microsomal detoxification enzyme, UDP-glucuronosyltransferase.
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http://dx.doi.org/10.1016/s0278-6915(02)00022-4 | DOI Listing |
Invest Ophthalmol Vis Sci
November 2024
Division of Endocrinology, Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
Toxicol Appl Pharmacol
January 2025
Toxconsult LLC, San Tan Valley, AZ, United States.
Some rat and dog toxicology studies with the fungicide valifenalate showed minimal, non-adverse thyroid changes, mostly above the maximum tolerated dose, and concomitantly with liver effects. This publication describes their mode of action (MOA), combining in vivo and new approach methodologies (NAMs), in a weight of evidence approach. Data demonstrate a MOA of liver enzyme induction via nuclear receptor CAR/PXR activation, increased thyroxine (T4) metabolism and elevated thyroid stimulating hormone (TSH) level, leading to thyroid follicular cell hypertrophy and increased thyroid weight.
View Article and Find Full Text PDFFront Pharmacol
October 2024
Animal Breeding and Genetics key Laboratory of Sichuan Province, Sichuan Animal Science Academy, Chengdu, China.
Introduction: Macranthoidin B (MB) is a primary active component of In Chinese veterinary clinics, is frequently used in combination with florfenicol to prevent and treat infections in livestock and poultry. However, potential interactions between and florfenicol remain unclear. To systematically study these interactions, it is crucial to investigate the individual phytochemicals within .
View Article and Find Full Text PDFChemosphere
October 2024
Univ Rennes, CHU Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, F-35000, Rennes, France. Electronic address:
Triazole pesticides are widely used fungicides, to which humans are rather highly exposed. They are known to activate drug-sensing receptors regulating expression of hepatic drug metabolizing enzymes and drug transporters, thus suggesting that the hepatic drug detoxification system is modified by these agrochemicals. To investigate this hypothesis, the effects of 9 triazole fungicides towards expression of drug metabolizing enzymes and transporters were characterized in cultured human HepaSH cells, that are human hepatocytes deriving from chimeric humanized liver TK-NOG mice.
View Article and Find Full Text PDFExpert Rev Clin Pharmacol
October 2024
Department of Psychiatry, Psychotherapy and Psychosomatics, University Hospital RWTH Aachen, Aachen, Germany.
Objective: We aimed to investigate the ambiguous findings of earlier research regarding the reduction of quetiapine plasma levels when combined with lamotrigine, most likely via UDP-glucuronosyltransferase induction by lamotrigine.
Methods: One thousand one hundred and fifty samples, divided into four groups of patients receiving either quetiapine immediate- (IR) or extended-release (XR) without or in combination with lamotrigine were compared regarding absolute and dose-adjusted plasma concentrations. Furthermore, samples of intra-individual controls were analyzed.
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