Green tea catechins decrease oxidative stress in surgical menopause-induced overactive bladder in a rat model

Yung Shun Juan, Shu Mien Chuang, Yi Lun Lee, Cheng Yu Long, Tzu Hui Wu, Wei Chiao Chang, Robert M. Levin, Keh Min Liu, Chun Hsiung Huang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Objective To evaluate whether green tea extract, epigallocatechin gallate (EGCG), could prevent ovariectomy-induced overactive bladder (OAB) and to investigate its antioxidant, anti-apoptotic and anti-fibrosis effects. Materials and Methods In all, 48 female Sprague-Dawley rats were divided into four groups. After bilateral ovariectomy, the first group served as the ovariectomy control, the second group received EGCG 1 ÂμM/kg daily i.p. injection after ovariectomy surgery, and the third group received EGCG 10 ÂμM/kg daily i.p. injection. The fourth group was taken as the sham without ovariectomy surgery. The rats were killed after 6 months after ovariectomy surgery. Cystometrograms were performed for the measure of bladder overactivity. Terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labelling (TUNEL) assay was used to evaluate apoptotic cells. Western immunoblots were performed to determine the expressions of inflammatory markers, apoptosis-associated proteins and oxidative stress markers. Results Long-term ovariectomy significantly increased non-voiding contractions and decreased bladder compliance. Treatment with EGCG significantly increased bladder compliance and diminished non-voiding contractions. Ovariectomy significantly increased apoptotic cells and enhanced interstitial fibrosis in bladders. The expression of caspase-3 significantly increased, while that of Bcl-2 notably decreased after ovariectomy. Inflammatory and fibrosis markers, TGF-β, fibronectin and type I collagen expressions were significantly increased after 6 months of ovariectomy surgery. Treatment with EGCG significantly decreased TGF-β and type I collagen expressions. Oxidative stress markers, nitrotyrosine and protein carbonylation levels were significantly increased in the ovariectomy group. EGCG could attenuate this oxidative damage in dose-dependent fashion. Conclusions Ovariectomy increased oxidative damage, enhanced voiding frequency and decreased bladder compliance. EGCG could restore ovariectomy-induced bladder dysfunction in a dose-dependent fashion through antioxidant, anti-fibrosis and anti-apoptosis effects.

Original languageEnglish
JournalBJU International
Volume110
Issue number6B
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

Keywords

  • catechin
  • ovariectomy
  • overactive bladder
  • oxidative stress

ASJC Scopus subject areas

  • Urology

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  • Cite this

    Juan, Y. S., Chuang, S. M., Lee, Y. L., Long, C. Y., Wu, T. H., Chang, W. C., Levin, R. M., Liu, K. M., & Huang, C. H. (2012). Green tea catechins decrease oxidative stress in surgical menopause-induced overactive bladder in a rat model. BJU International, 110(6B). https://doi.org/10.1111/j.1464-410X.2012.11258.x