Unknown,Transcriptomics,Genomics,Proteomics

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Liver expression data from four mouse strains treated with vehicle or PF-04287881 for seven days

ABSTRACT: PF-04287881 induced varying degrees of liver necrosis and phospholipidosis in a 34-inbred strain Mouse Diversity Panel (MDP) study. Four strains with differing susceptibilities to these phenotypes (MA/MyJ, NZW/LacJ, SM/J, WSB/EiJ) were selected for analysis of gene expression changes in the liver. The objective of this study was to identify gene expression changes that drive PF-04287881-induced liver injury. Thirty-one total samples were analyzed: N=4 per treatment and strain, except PF-04287881-treated WSB/EiJ (N=3) where one animal died before the completion of the study due to gavage error. Two strains exhibited findings of PF-04287881-induced Kupffer cell vacuolation and were coded as phospholipidosis responders (MA/MyJ and NZW/LacJ). One strain exhibited findings of single cell necrosis and was coded as a necrosis responder (NZW/LacJ).

ORGANISM(S): Mus musculus

SUBMITTER: Merrie Mosedale

PROVIDER: E-GEOD-52620 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Endoplasmic reticulum (ER) stress occurs when misfolded proteins accumulate in the ER. The cellular response to ER stress involves complex transcriptional and translational changes, important to the survival of the cell. ER stress is a primary cause and a modifier of many human diseases. A first step to understanding how the ER stress response impacts human disease is to determine how the transcriptional response to ER stress varies among individuals. The genetic diversity of the eight mouse Collaborative Cross (CC) founder strains allowed us to determine how genetic variation impacts the ER stress transcriptional response. We used tunicamycin, a drug commonly used to induce ER stress, to elicit an ER stress response in mouse embryonic fibroblasts (MEFs) derived from the CC founder strains and measured their transcriptional responses. We identified hundreds of genes that differed in response to ER stress across these genetically diverse strains. Strikingly, inflammatory response genes differed most between strains; major canonical ER stress response genes showed relatively invariant responses across strains. To uncover the genetic architecture underlying these strain differences in ER stress response, we measured the transcriptional response to ER stress in MEFs derived from a subset of F1 crosses between the CC founder strains. We found a unique layer of regulatory variation that is only detectable under ER stress conditions. Over 80% of the regulatory variation under ER stress derives from cis-regulatory differences. This is the first study to characterize the genetic variation in ER stress transcriptional response in the laboratory mouse. Our findings indicate that the ER stress transcriptional response is highly variable among strains and arises from genetic variation in individual downstream response genes, rather than major signaling transcription factors. These results have important implications for understanding how genetic variation impacts the ER stress response, an important component of many human diseases. We investigated the genetic variation in ER stress transcriptional response in mouse embryonic fibroblasts (MEFs) across eight mouse strains: A/J, C57BL/6J, 129S1Sv/ImJ, NOD/ShiLtJ, NZO/H1LtJ, CAST/EiJ, PWK/PhJ, and WSB/EiJ. MEFs from each strain were treated with a control DMSO or ER stress-inducing drug, Tunicamycin (TM). To identify the genetic architecture underlying this genetic variation, MEFs from F1 strains were also studied. MEFs from the following F1s were evaluated: C57BL/6J X CAST/EiJ, C57BL/6J X 129S1Sv/ImJ, C57BL/6J X NOD/ShiLtJ, C57BL/6J X NZO/H1LtJ, and C57BL/6J X WSB/EiJ. Again F1 MEFS were treated with either DMSO or TM. There are two or three replicates for each sample.

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Liver expression data from four mouse strains treated with vehicle or PF-04287881 for seven days

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