Adenovirus-mediated bcl-2 gene transfer inhibits renal ischemia/reperfusion induced tubular oxidative stress and apoptosis.

Abstract

Ischemia/reperfusion induces oxidative injury to proximal and distal renal tubular cells. We hypothesize that Bcl-2 protein augmentation with adenovirus vector mediated bcl-2 (Adv-bcl-2) gene transfer may improve ischemia/reperfusion induced renal proximal and distal tubular apoptosis through the mitochondrial control of Bax and cytochrome C translocation. Twenty-four hours of Adv-bcl-2 transfection to proximal and distal tubular cells in vitro upregulated Bcl-2/Bax ratio and inhibited hypoxia/reoxygenation induced cytochrome C translocation, O(2) (-) production and tubular apoptosis. Intra-renal arterial Adv-bcl-2 administration with renal venous clamping augmented Bcl-2 protein of rat kidney in vivo in a time-dependent manner. The maximal Bcl-2 protein expression appeared at 7 days after Adv-bcl-2 administration and the primary location of Bcl-2 augmentation was in proximal and distal tubules, but not in glomeruli. With a real-time monitoring O(2) (-) production and apoptosis analysis of rat kidneys, ischemia/reperfusion increased renal O(2) (-) level, potentiated proapoptotic mechanisms, including decrease in Bcl-2/Bax ratio, increases in caspase 3 expression and poly-(ADP-ribose)-polymerase fragments and subsequent proximal and distal tubular apoptosis. However, Adv-bcl-2 administration significantly enhanced Bcl-2/Bax ratio, decreased ischemia/reperfusion induced O(2) (-) amount, inhibited proximal and distal tubular apoptosis and improved renal function. Our results suggest that Adv-bcl-2 gene transfer significantly reduces ischemia/reperfusion induced oxidative injury in the kidney.

• Authors: Chiang-Ting Chien, Chien Chiang-Ting, Tzu-Ching Chang, Chang Tzu-Ching, Ching-Yi Tsai, Tsai Ching-Yi, Song-Kuen Shyue, Shyue Song-Kuen, Ming-Kuen Lai, Lai Ming-Kuen
• Journal: American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons (Am J Transplant) Vol. 5 Issue 6 Pg. 1194-203 (Jun 2005) ISSN: 1600-6135 [Print] United States
• PMID: 15888023 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Proto-Oncogene Proteins c-bcl-2
• Cytochromes c
• Poly(ADP-ribose) Polymerases
• Caspases

Topics

• Adenoviridae (genetics)
• Animals
• Apoptosis
• Caspases (metabolism)
• Cytochromes c (metabolism)
• Female
• Gene Transfer Techniques
• Genetic Therapy (methods)
• Genetic Vectors
• Humans
• Kidney Diseases (pathology, prevention & control)
• Kidney Tubules, Distal (drug effects, metabolism)
• Kidney Tubules, Proximal (drug effects, metabolism)
• Oxidative Stress
• Poly(ADP-ribose) Polymerases (metabolism)
• Proto-Oncogene Proteins c-bcl-2 (genetics, metabolism)
• Rats
• Rats, Wistar
• Reperfusion Injury (pathology, prevention & control)