By:Dalaklioglu, S (Dalaklioglu, Selvinaz)^{[ 1 ]} ; Sahin, P (Sahin, Pinar)^{[ 2 ]} ; Ordueri, EG (Ordueri, Ece Gungor)^{[ 2 ]} ; Celik-Ozenci, C (Celik-Ozenci, Ciler)^{[ 2 ]} ; Tasatargil, A (Tasatargil, Arda)^{[ 1 ]}

INTERNATIONAL JOURNAL OF TOXICOLOGY

DOI: 10.1177/1091581812457430

Published: SEP-OCT 2012

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INTERNATIONAL JOURNAL OF TOXICOLOGY

Publisher SAGE PUBLICATIONS INC, 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA

ISSN: 1091-5818

Research Domain Pharmacology & Pharmacy
Toxicology

Nephrotoxicity is one of the serious dose-limiting complications of methotrexate (MTX) when used in the treatment of various malignancies and nononcological diseases. The aim of this study was to investigate the role of poly(adenosine diphosphate ribose) polymerase (PARP) activity in MTX-induced nephrotoxicity. Rats were divided into 4 groups as control, MTX treated (MTX, 7 mg/kg per d, intraperitoneally [ip], once daily for 3 consecutive days), MTX plus 1,5-isoquinelinediol (ISO, a PARP inhibitor, 3 mg/kg per d, i.p.) treated, or ISO treated. Histopathology of kidneys was evaluated by light microscopy. Terminal deoxynucleotidyl transferase deoxyuridine triphosphate nick end labeling assay was used to analyze apoptosis in kidney sections. Blood urea nitrogen (BUN), serum creatinine, and urinary N-acetyl-beta-d-glucosaminidase (NAG) were used as biochemical markers of MTX-induced renal injury. Our results showed that MTX administration significantly increased BUN, serum creatinine, and urinary NAG levels. The PARP-1 and PAR (a product of PARP activity) expression and apoptotic cell death were also markedly increased in renal tubules after MTX administration. The ISO treatment attenuated MTX-induced renal injury, as indicated by BUN and serum creatinine levels, urinary NAG excretion, and renal histology. The PARP inhibitor treatment reduced PARP-1 and PAR expression to levels similar to that of controls. These results revealed that ISO may have a protective effect against the nephrotoxic effects of MTX by inhibiting PARP activation. This is the first study that demonstrates the role of PARP activation in MTX-induced nephrotoxicity and tubular apoptosis.

Author Keywords:methotrexate; nephrotoxicity; poly(ADP-Ribose) polymerase

KeyWords Plus:HIGH-DOSE METHOTREXATE; INDUCED ENDOTHELIAL DYSFUNCTION; ISCHEMIC RENAL INJURY; ADP-RIBOSE POLYMERASE; ISOLATED RAT AORTA; OXIDATIVE STRESS; CELL-DEATH; HEMORRHAGIC-SHOCK; TOXICITY; LIPOPOLYSACCHARIDE