Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.taap.2009.05.007
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dc.titleUnderlying mitochondrial dysfunction triggers flutamide-induced oxidative liver injury in a mouse model of idiosyncratic drug toxicity
dc.contributor.authorKashimshetty, R.
dc.contributor.authorDesai, V.G.
dc.contributor.authorKale, V.M.
dc.contributor.authorLee, T.
dc.contributor.authorMoland, C.L.
dc.contributor.authorBranham, W.S.
dc.contributor.authorNew, L.S.
dc.contributor.authorChan, E.C.Y.
dc.contributor.authorYounis, H.
dc.contributor.authorBoelsterli, U.A.
dc.date.accessioned2014-10-29T02:00:40Z
dc.date.available2014-10-29T02:00:40Z
dc.date.issued2009-07-15
dc.identifier.citationKashimshetty, R., Desai, V.G., Kale, V.M., Lee, T., Moland, C.L., Branham, W.S., New, L.S., Chan, E.C.Y., Younis, H., Boelsterli, U.A. (2009-07-15). Underlying mitochondrial dysfunction triggers flutamide-induced oxidative liver injury in a mouse model of idiosyncratic drug toxicity. Toxicology and Applied Pharmacology 238 (2) : 150-159. ScholarBank@NUS Repository. https://doi.org/10.1016/j.taap.2009.05.007
dc.identifier.issn0041008X
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/106481
dc.description.abstractFlutamide, a widely used nonsteroidal anti-androgen, but not its bioisostere bicalutamide, has been associated with idiosyncratic drug-induced liver injury. Although the susceptibility factors are unknown, mitochondrial injury has emerged as a putative hazard of flutamide. To explore the role of mitochondrial sensitization in flutamide hepatotoxicity, we determined the effects of superimposed drug stress in a murine model of underlying mitochondrial abnormalities. Male wild-type or heterozygous Sod2+/- mice were injected intraperitoneously with flutamide (0, 30 or 100 mg/kg/day) for 28 days. A kinetic pilot study revealed that flutamide (100 mg/kg/day) caused approximately 10-fold greater exposure than the reported therapeutic mean plasma levels. Mutant (5/10), but not wild-type, mice in the high-dose group exhibited small foci of hepatocellular necrosis and an increased number of apoptotic hepatocytes. Hepatic GSSG/GSH, protein carbonyl levels, and serum lactate levels were significantly increased, suggesting oxidant stress and mitochondrial dysfunction. Measurement of mitochondrial superoxide in cultured hepatocytes demonstrated that mitochondria were a significant source of flutamide-enhanced oxidant stress. Indeed, mitochondria isolated from flutamide-treated Sod2+/- mice exhibited decreased aconitase activity as compared to vehicle controls. A transcriptomics analysis using MitoChips revealed that flutamide-treated Sod2+/- mice exhibited a selective decrease in the expression of all complexes I and III subunits encoded by mitochondrial DNA. In contrast, Sod2+/- mice receiving bicalutamide (50 mg/kg/day) did not reveal any hepatic changes. These results are compatible with our concept that flutamide targets hepatic mitochondria and exerts oxidant stress that can lead to overt hepatic injury in the presence of an underlying mitochondrial abnormality. © 2009 Elsevier Inc.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.taap.2009.05.007
dc.sourceScopus
dc.subjectBicalutamide
dc.subjectDrug-induced liver injury (DILI)
dc.subjectFlutamide
dc.subjectHepatotoxicity
dc.subjectIdiosyncratic drug toxicity
dc.subjectMitochondria
dc.subjectSod2+/- mice
dc.subjectSuperoxide dismutase
dc.typeArticle
dc.contributor.departmentPHARMACY
dc.description.doi10.1016/j.taap.2009.05.007
dc.description.sourcetitleToxicology and Applied Pharmacology
dc.description.volume238
dc.description.issue2
dc.description.page150-159
dc.description.codenTXAPA
dc.identifier.isiut000267584200006
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