Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Expression data from rat urinary bladder and non-glandular stomach tissue samples

ABSTRACT: Seven novel and potent Raf small molecule kinase inhibitors were evaluated in 7-day oral repeat-dose rat toxicity studies. All compounds tested induced hyperplasia in multiple tissues. Microarrays were used to investigate transciptional changes associated by treatment with a single compound to gain insight into the cellular changes that may contribute to the tissue hyperplasia. Two groups (25 females/group) received oral daily dosing for 7 days of either Vehicle or compound C1 dosed at 100 mg/kg. Five animals from each group were euthanized on Days 1 (4-5 hrs post first dose; received 1 dose), 2 (received 1 dose), 3 (received 2 doses), 5 (received 4 doses) and 8 (received 7 doses). Bladder tissues were collected and profiled at all five time points. Stomach tissues were collected and profiled at the earliest two time points. A single day 3 animal was not available for genomic profiling; therefore, expression data was collected for a total of 49 bladder and 20 stomach samples.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Scott Taylor

PROVIDER: E-GEOD-26936 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Raf inhibition causes extensive multiple tissue hyperplasia and urinary bladder neoplasia in the rat.

Wisler John A JA Afshari Cynthia C Fielden Mark M Zimmermann Cameron C Taylor Scott S Carnahan Josette J Vonderfecht Steven S

Toxicologic pathology 20110615 5

Seven novel and potent Raf small molecule kinase inhibitors (C1-7) were evaluated in seven-day oral repeat dose rat toxicity studies. All compounds tested induced hyperplasia in multiple tissues. Consistently affected was stratified squamous epithelium at a number of sites and transitional epithelium of urinary bladder and kidney. A seven-day time course study in rats showed morphologic evidence of epithelial proliferation in the nonglandular stomach within four to five hours after a single dose ...[more]

PMID: 21677315

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Project description:Furan is a widely used industrial chemical and a common contaminant in heated foods. Chronic furan exposure has been shown to cause cholangiocarcinoma and hepatocellular tumors at doses of 2 mg/kg bw/day with gender differences in frequency and severity. The hepatic transcriptional alterations induced by low doses of furan (doses below those inducing liver tumors) and the potential mechanisms underlying gender differences are largely unexplored. We used DNA microarrays to examine the global hepatic mRNA and microRNA transcriptional profiles of male and female rats exposed to 0, 0.03, 0.12, 0.5 or 2 mg/kg bw/day furan over 90 days. Marked gender differences in gene expression responses to furan were observed, with many more altered genes in exposed males than females, confirming the increased sensitivity of males even at the low doses. Pathway analysis supported that key events in furan-induced hepatotoxicity in males included gene expression changes related to oxidative stress, apoptosis and inflammatory response, while pathway changes in females were consistent with primarily adaptive responses (regeneration). Pathway benchmark doses (BMDs) were estimated and compared to relevant apical endpoints. Transcriptional BMDs could be examined in males, they ranged from 0.08 – 1.43 mg/kg bw/day and approximated those derived from traditional histopathology. MiR-34a (a target of P53 signalling) was the only microRNA significantly increased at the 2 mg/kg bw/day, providing evidence in support of the importance of apoptosis and cell proliferation in furan hepatotoxicity. Overall, this study demonstrates the use of transcriptional profiling to discern mode of action and mechanisms involved in gender differences. Total RNAs from 16 liver samples (4 males and 4 females from control and 2 mg/kg bw/day dose groups) were processed using the miRNA Complete Labelling and Hybridization kit (Agilent Technologies Inc.). Labelled RNA was hybridized on 8 X 15K Agilent rat miRNA microarray slides. Arrays were scanned using an Agilent G2505B scanner (5 ?M resolution). Feature extraction (version 10.7.3.1, Agilent Tech. Inc.) was used to acquire the fluorescence intensity of each probe.

Dataset Information

Expression data from rat urinary bladder and non-glandular stomach tissue samples

Publications

Raf inhibition causes extensive multiple tissue hyperplasia and urinary bladder neoplasia in the rat.

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