Print Email Facebook Twitter Bromobenzene-induced hepatotoxicity at the transcriptome level Title Bromobenzene-induced hepatotoxicity at the transcriptome level Author Heijne, W.H.M. Slitt, A.L. van Bladeren, P.J. Groten, J.P. Klaassen, C.D. Stierum, R.H. van Ommen, B. TNO Voeding Centraal Instituut voor Voedingsonderzoek TNO Publication year 2004 Abstract Rats were exposed to three levels of bromobenzene, sampled at 6, 24, and 48 h, and liver gene expression profiles were determined to identify dose and time-related changes. Expression of many genes changed transiently, and dependent on the dose. Few changes were identified after 6 h, but many genes were differentially expressed after 24 h, while after 48 h, only the high dose elicited large effects. Differentially expressed genes were involved in drug metabolism (upregulated GSTs, mEH, NQO1, Mrps, downregulated CYPs, sulfotransferases), oxidative stress (induced HO-1, peroxiredoxin, ferritin), GSH depletion (induced GCS-1, GSTA, GSTM) the acute phase response, and in processes like cholesterol, fatty acid and protein metabolism, and intracellular signaling. Trancriptional regulation via the electrophile and sterol response elements seemed to mediate part of the response to bromobenzene. Recovery of the liver was suggested in response to BB by the altered expression of genes involved in protein synthesis and cytoskeleton rearrangement. Furthermore, after 48 h, rats in the mid dose group showed no toxicity, and gene expression patterns resembled the normal situation. For certain genes (e.g., CYP4A, metallothioneins), intraday variation in expression levels was found, regardless of the treatment. Selected cDNA microarray measurements were confirmed using the specific and sensitive branched DNA signal amplification assay. © Society of Toxicology 2004; all rights reserved. Subject Biology ToxicologyPhysiological SciencesBromobenzenecDNA microarrayHepatotoxicityRatToxicogenomicsTranscriptomicsBromobenzeneCholesterolComplementary DNACytochrome P450 4AFatty acidGlutathioneMessenger RNAMetallothioneinProteinSterolAcute phase responseAnimal experimentAnimal modelAnimal tissueCell communicationCholesterol metabolismConcentration responseControlled studyCytoskeletonDNA determinationDNA microarrayDNA responsive elementDrug metabolismElectronFatty acid metabolismGene amplificationGene expression profilingGene rearrangementLiver toxicityNonhumanNucleotide sequenceOxidative stressProtein depletionProtein metabolismProtein synthesisRatSignal transductionTranscription regulationAnimalsBromobenzenesGene Expression ProfilingGene Expression RegulationGlutathioneHepatitis, ToxicLiverMaleMicroarray AnalysisOligonucleotide Array Sequence AnalysisRatsRats, Inbred StrainsTime FactorsTranscription, Genetic To reference this document use: http://resolver.tudelft.nl/uuid:6b08aef2-7b66-4719-8ff3-91d1b3655b07 DOI https://doi.org/10.1093/toxsci/kfh128 TNO identifier 237784 ISSN 1096-6080 Source Toxicological Sciences, 79 (2), 411-422 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.