Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of mouse cell culture treated with LPS to identify of inflammatory genes suppressed by heat shock

ABSTRACT: To clarify inflammatory genes whose expression is suppressed at high temperatures, we performed comprehensive analysis of gene expression by using a DNA microarray. Two independent primary cultures of mouse embryo fibroblasts (MEF1 and MEF2) were treated with LPS for 4 hours, or treated with LPS for 4 hours after the pretreatment with heat shock at 42ËC for 1 hour, and we identified 100 genes that undergo more than a 3-fold increase with LPS treatment. Remarkably, 86 genes (86%) underwent less than a 2-fold increase after combined treatments with heat shock and LPS in MEF1 and MEF2 cells. Experiment Overall Design: Total RNAs were prepared from two primary cultures of mouse embryo fibroblasts (MEF) derived from two independent embryos at embryonic day 15.5 (ICR mice). Cells were maintained at 37ËC (Control), treated with lipopolysaccharide (LPS, E. coli 0127:B8, Sigma, 1 Î¼g/ml) for 4 hours, or treated with LPS for 4 hours after the pretreatment of heat shock at 42ËC for 1 hour. Gene expression was analyzed by using GeneChip Mouse Genome 430 2.0 Array (Affymetrix, Santa Clara, CA).

ORGANISM(S): Mus musculus

SUBMITTER: Akira Nakai

PROVIDER: E-GEOD-16266 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Heat shock transcription factor 1 inhibits expression of IL-6 through activating transcription factor 3.

Takii Ryosuke R Inouye Sachiye S Fujimoto Mitsuaki M Nakamura Tamami T Shinkawa Toyohide T Prakasam Ramachandran R Tan Ke K Hayashida Naoki N Ichikawa Hitoshi H Hai Tsonwin T Nakai Akira A

Journal of immunology (Baltimore, Md. : 1950) 20091216 2

The febrile response is a complex physiological reaction to disease, including a cytokine-mediated increase in body temperature and the activation of inflammatory systems. Fever has beneficial roles in terms of disease prognosis, partly by suppressing the expression of inflammatory cytokines. However, the molecular mechanisms underlining the fever-mediated suppression of inflammatory gene expression have not been clarified. In this study, we showed that heat shock suppresses LPS-induced expressi ...[more]

PMID: 20018623

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Project description:Direct comparison of the genome-level expression patterns of THP-1 cells exposed to either LPS or heat shock; Peripheral blood mononuclear cells (PBMC) serve a sentinel role allowing the host to efficiently sense and adapt to the presence of danger signals. Herein we have directly compared the genome-level expression patterns (microarray) of human PBMC (THP-1 cells) subjected to one of two canonical danger signals, heat shock and lipopolysaccharide (LPS). Based on sequential expression and statistical filters, and in comparison to control cells, we found that 3,988 genes were differentially regulated in THP-1 cells subjected to LPS stress, and 2,921 genes were differentially regulated in THP-1 cells subjected to heat shock stress. Venn analyses demonstrated that the majority of differentially regulated genes (greather than or equal to 70%) were uniquely expressed in response to one of the two danger signals. Functional analyses demonstrated that the two danger signals induced expression or repression of genes corresponding to unique pathways, molecular functions, biological processes, and gene networks. In contrast, there were 184 genes that were commonly upregulated by both stress signals, and 430 genes that were commonly downregulated by both stress signals. Interestingly, the 184 commonly upregulated genes corresponded to a gene network broadly related to inflammation, and more specifically to chemokine signaling. These data demonstrate that the mononuclear cell responses to the canonical stress signals, heat shock and LPS, are highly divergent. However, there is a heretofore unrecognized common pattern of gene network expression corresponding to chemokine-related biology. The data also serve as a reference database for investigators in the field of stress signaling. Experiment Overall Design: In vitro exposure of THP-1 cells to control conditions, LPS (1 micogram/ml for 4 hrs), or heat shock (43 deg C for 1 hour, followed by a 4 hour recovery at 37 deg C)