Effect of Adenoviral Catalase Gene Transfer on Renal Ischemia/Reperfusion Injury in Rats

Chih-Ching Yang ； Ship-Ping Hsu ； Kuo-Hsin Chen ； Chiang-Ting Chien

《The Chinese Journal of Physiology》 58卷6期 (2015/12) Pp. 420-430

https://doi.org/10.4077/CJP.2015.BAD324

並列摘要

Ischemia/reperfusion (I/R) may through overt H_2O_2-induced pathophysiologic mechanisms lead to renal dysfunction. We explore whether catalase (CAT) protein overexpression by adenoviral CAT gene(Adv-CAT) transfection may improve ischemia/reperfusion-induced renal dysfunction. We augmented renal CAT expression by intrarenal arterial Adv-CAT administration with renal venous clamping in avertin-anesthetized female Wistar rats. After Adv-CAT transfection, we examined the CAT expression, location and effects on blood urea nitrogen (BUN) and urinary tubular injury biomarkers by biochemical assays, microcirculation by a laser perfusion imager, renal H_2O_2 amount by a chemiluminescent analyzer and molecular mechanisms including cytosolic cytochrome C leakage, apoptosis, autophagy and phospho-Akt (p-Akt)/phospho-endothelial nitric oxide (p-eNOS)/nitric oxide (NO) signaling by western blotting, immunohistochemistry and immunofluorescence. Adv-CAT enhanced 2.6-fold renal CAT protein expression primarily located in the proximal and distal tubules and renal vessels. Ischemia/reperfusion increased cytosolic cytochrome C leakage, renal H_2O_2-dependent level, autophagic Beclin-1/Atg5-Atg12/LC3 II expression, apoptotic Bax/Bcl-2/caspase 3/poly-(ADP-ribose)-polymerase fragments (PARP) expression and terminal deoxynucleotidyl transferasemediated nick-end labeling (TUNEL) stains and BUN and urinary glutathione S-transferase (GST) levels leading to proximal tubular injury. Ischemia/reperfusion also decreased renal microvascular blood flow associated with the inhibited renal expression of p-Akt and p-eNOS and NO production. Adv-CAT significantly improved the reduction in renal microvascular blood flow, reduced ischemia/reperfusion-enhanced oxidative stress, Beclin-1/Atg5-Atg12/LC3 II-meidated autophagy, Bax/Bcl-2/caspase 3/PARP-mediated apoptotic signaling, TUNEL stains, urinary GST level, and restored the p-Akt/p-eNOS/NO signaling in the kidney. Treatment of phosphatidylinositol 3-kinase inhibitors, wortmannin and LY294002, deleted Adv-CAT-induced p-Akt/p-eNOS/NO protective signaling. In conclusion, our results suggest Adv-CAT gene transfer counteracts H_2O_2-induced ischemia/reperfusion injury through preserving p-Akt/p-eNOS/NO pathway in the rat kidney.

並列關鍵字

adenoviral catalase ； apoptosis ； autophagy ； ischemia/reperfusion (I/R) ； kidney ； nitric oxide

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