TEMPONE reduces renal dysfunction and injury mediated by oxidative stress of the rat kidney.
Here we investigate the effects of the stable, water-soluble nitroxyl radical, TEMPONE, on renal dysfunction and injury caused by ischemia/reperfusion (I/R) of the rat kidney in vivo. TEMPONE significantly improved both glomerular and tubular function (serum urea, creatinine, creatinine clearance, and fractional excretion of Na(+)) in a dose-dependent manner and significantly attenuated the reperfusion-injury associated with I/R (urinary N-acetyl-beta-D-glucosaminidase, aspartate aminotransferase, assessment of renal histology). TEMPONE also markedly reduced the immunohistochemical evidence of the formation of nitrotyrosine and poly(ADP-ribose), indicating reduction of nitrosative and oxidative stress, respectively. The latter was reflected in vitro, where TEMPONE significantly reduced cellular injury of primary cultures of rat renal proximal tubular (PT) cells caused by hydrogen peroxide in a dose-dependent manner. Importantly, in contrast to its in vivo metabolite TEMPOL (which also provided protective effects against renal I/R and oxidative stress of PT cells), TEMPONE reduced renal dysfunction and injury without causing a significant reduction in blood pressure upon administration. These results suggest, for the first time, that TEMPONE can reduce the renal dysfunction and injury caused by I/R and the injury caused to PT cells by oxidative stress without producing the adverse cardiovascular effects observed when using other nitroxyl radicals.
Patel
Nimesh S A
NS
Department of Experimental Medicine and Nephrology, The William Harvey Research Institute, London, England.
Chatterjee
Prabal K
PK
Chatterjee
Bristi E
BE
Cuzzocrea
Salvatore
S
Serraino
Ivana
I
Brown
Paul A J
PA
Stewart
Keith N
KN
Mota-Filipe
Helder
H
Thiemermann
Christoph
C
D000818:Animals; D004396:Coloring Agents / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007150:Immunohistochemistry; D007668:Kidney / Q000187:drug effects / Q000378:metabolism / Q000473:pathology* / Q000502:physiology; D007674:Kidney Diseases / Q000188:drug therapy / Q000473:pathology*; D008297:Male; D051379:Mice; D009584:Nitrogen / Q000737:chemistry; D018384:Oxidative Stress; D011064:Poly Adenosine Diphosphate Ribose / Q000737:chemistry; D011065:Poly(ADP-ribose) Polymerases / Q000737:chemistry; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species; D015427:Reperfusion Injury; D013778:Tetrazolium Salts / Q000494:pharmacology; D013844:Thiazoles / Q000494:pharmacology; D014216:Triacetoneamine-N-Oxyl / Q000494:pharmacology*; D014443:Tyrosine / Q000031:analogs & derivatives* / Q000737:chemistry; D014556:Urine
D004396:Coloring Agents; D017382:Reactive Oxygen Species; D013778:Tetrazolium Salts; D013844:Thiazoles; D011064:Poly Adenosine Diphosphate Ribose; D014216:Triacetoneamine-N-Oxyl; C002744:3-nitrotyrosine; D014443:Tyrosine; D006861:Hydrogen Peroxide; D011065:Poly(ADP-ribose) Polymerases; C022616:thiazolyl blue; D009584:Nitrogen