Unilateral ureteral obstruction evokes renal tubular apoptosis via the enhanced oxidative stress and endoplasmic reticulum stress in the rat

Chung Hsin Yeh, Han Sun Chiang, Ting Yu Lai, Chiang Ting Chien

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Purpose: Oxidative stress and endoplasmic reticulum (ER) stress may induce renal apoptosis and contribute to the pathogenesis of the kidney with unilateral ureteral obstruction (UUO). Materials and Methods: We induced UUO the female Wistar rats by ligation of the left ureter at the ureteropelvic junction. The UUO kidney was performed from 4 hr to 7 days course. At the indicated time, we measured the arterial blood pressure and renal blood flow in each rat, renal ROS measurement in vivo by a chemiluminescence analyzer. We performed immunohistochemistry of monocyte/macrophage (ED-1) stain for leukocyte infiltration, 4-hydroxynoneal (4-HNE) stain for ROS products, and apoptosis by terminal deoxynucleotidyl transferase-mediated nick-end labeling (TUNEL) and Western blot to analyze ER stress-associated andapoptosis-related proteins expression in the UUO kidney. Results: We found that UUO decreased renal blood flow and increased renal vascular resistance and renal ROS. UUO decreased renal manganese superoxide dismutase (MnSOD) and catalase protein expression in a time-dependent manner. Increased 4-HNE stain in the renal tubules and ED-1 stain in the renal tubulointerstitial compartment occurred after 4 hr of UUO in the kidney. UUO significantly enhanced ER stress markers like ER stress-response protein 25 and glucose-regulated protein 78 and ER-associated apoptosis proteins, c-JUN NH2-terminal kinase, and caspase 12, in the kidney. Subsequently, UUO enhanced renal pro-apoptotic Bax and caspase 3 expression and decreased anti-apoptotic Bcl-2 expression, leading to renal tubular apoptosis. Conclusions: Our data suggest that renal tubular apoptosis induced by oxidative stress and ER stress occurred in the UUO kidney. 2011.

Original languageEnglish
Pages (from-to)472-479
Number of pages8
JournalNeurourology and Urodynamics
Volume30
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1

Keywords

  • Apoptosis
  • Endoplasmic reticulum stress
  • Kidney
  • Oxidative stress
  • Unilateral ureteral obstruction

ASJC Scopus subject areas

  • Clinical Neurology
  • Urology

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