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J Am Soc Nephrol 15:2152-2160, 2004
© 2004 American Society of Nephrology

BASIC SCIENCE

Involvement of Peripheral Benzodiazepine Receptor in the Oxidative Stress, Death-Signaling Pathways, and Renal Injury Induced by Ischemia-Reperfusion

Oxana R. Kunduzova*, Ghislaine Escourrou{dagger}, France De La Farge{ddagger}, Robert Salvayre§, Marie-Hélène Séguélas*, Nathalie Leducq, Françoise Bono, Jean-Marc Herbert and Angelo Parini*

*INSERM U388, IFR31, Institut Louis Bugnard, CHU Rangueil, Toulouse, France; {dagger}Department of Pathology, CHU Rangueil, Toulouse, France; {ddagger}Laboratory of Biochemistry, CHU Rangueil, Toulouse, France; §INSERM U-466, IFR-31, University Paul Sabatier, Bat L3, CHU Rangueil, Toulouse, France; and Cardiovascular-Thrombosis Research Department, Sanofi-Synthélabo Research, Toulouse, France.

Correspondence to Dr. Angelo Parini, INSERM U388, Institut Louis Bugnard, CHU Rangueil, Bat. L3, 31403 Toulouse Cedex 4, France. Phone: +33-561322622; Fax: +33-562172554; E-mail: parini{at}toulouse.inserm.fr

The peripheral benzodiazepine receptor (PBR) is a critical component of the mitochondrial permeability transition pore, which is involved in the regulation of cell death. In the present study we investigated the role of PBR in the regulation of signaling pathways leading to apoptotic and necrotic damage and renal dysfunction in a rat model of ischemia-reperfusion. Renal ischemia-reperfusion led to extended tubular apoptosis and necrosis that were associated with peroxidative damage, high levels of proapoptotic Bax expression, and low levels of antiapoptotic Bcl-2 expression, cleavage of death substrate, poly(ADP-ribose) polymerase (PARP), and activation of a key effector of apoptosis, caspase-3. Rat pretreatment with a novel PBR antagonist, SSR180575, significantly decreased postreperfusion oxidative stress and tubular apoptosis and necrosis. This effect was associated with inhibition of caspase-3 activation and PARP cleavage, upregulation of Bcl-2, and downregulation of Bax. Furthermore, inhibition of PBR accelerated the recovery of normal renal function, as assessed by measurement of levels of plasma creatinine and blood urea nitrogen. These findings reveal a role for PBR as a modulator of necrotic and apoptotic cell death induced by ischemia-reperfusion and suggest that regulation of PBR may provide new therapeutic implications for the prevention of acute renal failure.




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