Effects of green tea on urinary stone formation: an in vivo and in vitro study.

Abstract:

PURPOSE:We evaluated whether epigallocatechin gallate (EGCG), a main constituent of green tea polyphenols, could protect against cellular toxicity by oxalate and whether green tea supplementation attenuates the development of nephrolithiasis in an animal model. MATERIALS AND METHODS:Cells of the NRK-52E line were incubated with different concentrations of oxalate with and without EGCG, and toxicity and malondialdehyde assays were done to investigate the cytotoxic effect of oxalate and the anti-oxalate effect of EGCG.. In a second series of experiments, male Sprague-Dawley rats were divided into three groups. Group 1 animals (controls) were fed regular chow and drank water ad libitum; group 2 animals were fed chow containing 3% sodium oxalate with the administration of gentamicin (40 mg/kg) and drank water ad libitum; group 3 animals were fed the same diet as group 2 with gentamicin administration and drank only green tea. Rats were killed 4 weeks later after a 24-hour urine collection, and the kidneys were removed for morphologic examination. RESULTS:As oxalate concentrations increased, the number of surviving cells decreased, and the formation of free radicals increased. The administration of EGCG inhibited free-radical production induced by oxalate. Green tea supplementation decreased the excretion of urinary oxalate and the activities of urinary gammaglutamyltranspeptidase and N-acetylglucosaminidase. The number of crystals within kidneys in group 3 was significantly lower than in group 2. CONCLUSIONS:Green tea has an inhibitory effect on urinary stone formation, and the antioxidative action of EGCG is considered to be involved.

journal_name

J Endourol

journal_title

Journal of endourology

authors

Jeong BC,Kim BS,Kim JI,Kim HH

doi

10.1089/end.2006.20.356

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

356-61

issue

5

eissn

0892-7790

issn

1557-900X

journal_volume

20

pub_type

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