Renal toxicogenomic response to chronic uranyl nitrate insult in mice
Résumé
Although the nephrotoxkity of uranium has been established through numerous animal studies, relatively little is known about the effects of long-term environmental uranium exposure. Using a combination of conventional biochemical studies and serial analysis of gene expression (SAGE), we examined the renal responses to uranyl nitrate (UN) chronic exposure. Renal uranium levels were significantly increased 4 months after ingestion of uranium in drinking water. Creatinine levels in serum were slightly but significantly increased compared with those in controls. Although no further significant differences in other parameters were noted, substantial molecular changes were observed in toxicogenomic profiles. UN induced dramatic alterations in expression levels of more than 200 genes, mainly up-regulated, including oxidative-response-related genes, genes encoding for cellular metabolism, ribosomal proteins, signal transduction, and solute transporters. Seven differentially expressed transcripts were confirmed by real-time quantitative polymerase chain reaction. In addition, significantly increased peroxide levels support the implication of oxidative stress in UN toxicant response. This report highlights the potential of SAGE for the discovery of novel toxicant-induced gene expression alterations. Here, we present, for the first time, a comprehensive view of renal molecular events after uranium long-term exposure.
Mots clés
creatinine
drinking water
ribosome protein
uranyl nitrate
hydrogen peroxide
primer DNA
RNA
animal experiment
article
cell metabolism
controlled study
creatinine blood level
gene expression
long term exposure
mouse
nonhuman
oxidative stress
priority journal
real time polymerase chain reaction
serial analysis of gene expression
signal transduction
toxicogenetics
animal
C57BL mouse
DNA microarray
drug effect
gene expression profiling
gene expression regulation
kidney
metabolism
oral drug administration
randomization
reverse transcription polymerase chain reaction
sequence tagged site
Animalia
Administration
Oral
Animals
DNA Primers
Gene Expression Profiling
Gene Expression Regulation
Hydrogen Peroxide
Kidney
Mice
Inbred C57BL
Oligonucleotide Array Sequence Analysis
Oxidative Stress
Random Allocation
Reverse Transcriptase Polymerase Chain Reaction
Sequence Tagged Sites
Uranyl Nitrate
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