Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.freeradbiomed.2005.08.038
Title: Nimesulide-induced hepatic mitochondrial injury in heterozygous Sod2+/-mice
Authors: Ong, M.M.K.
Wang, A.S.
Leow, K.Y.
Khoo, Y.M.
Boelsterli, U.A. 
Keywords: Apoptosis
Free radicals
Idiosyncratic liver injury
Mitochondrial stress
NSAIDs
Oxidative stress
Superoxide dismutase
Issue Date: 2006
Source: Ong, M.M.K., Wang, A.S., Leow, K.Y., Khoo, Y.M., Boelsterli, U.A. (2006). Nimesulide-induced hepatic mitochondrial injury in heterozygous Sod2+/-mice. Free Radical Biology and Medicine 40 (3) : 420-429. ScholarBank@NUS Repository. https://doi.org/10.1016/j.freeradbiomed.2005.08.038
Abstract: Nimesulide, a preferential COX-2 inhibitor, has been associated with rare idiosyncratic hepatotoxicity. The underlying mechanisms of liver injury are unknown, but experimental evidence has identified oxidative stress as a potential hazard and mitochondria as a target. The aim of this study was to explore whether genetic mitochondrial abnormalities, resulting in impaired mitochondrial function and mildly increased oxidative stress, might sensitize mice to the hepatic adverse effects of nimesulide. We used heterozygous superoxide dismutase 2 (Sod2+/-) mice as a model, as these mice develop clinically silent mitochondrial stress but otherwise appear normal. Nimesulide was administered for 4 weeks (10 mg/kg, ip, bid), at a dose equivalent to human therapeutic dosage. We found that the drug potentiated hepatic mitochondrial oxidative injury (decreased aconitase activity, increased protein carbonyls) in Sod2+/-, but not wild-type, mice. Furthermore, the nimesulide-treated mutant mice exhibited increased hepatic cytosolic levels of cytochrome c and caspase-3 activity, as well as increased numbers of apoptotic hepatocytes. Finally, nimesulide in vitro caused a concentration-dependent net increase in superoxide anion in mitochondria from Sod2+/-, but not Sod2+/+ mice. In conclusion, repeated administration of nimesulide can superimpose an oxidant stress, potentiate mitochondrial damage, and activate proapoptotic factors in mice with genetically compromised mitochondrial function. © 2005 Elsevier Inc. All rights reserved.
Source Title: Free Radical Biology and Medicine
URI: http://scholarbank.nus.edu.sg/handle/10635/27311
ISSN: 08915849
DOI: 10.1016/j.freeradbiomed.2005.08.038
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