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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Cooper, Zachary A. Ghosh, Arundhati Gupta, Aditi Maity, Tapan Benjamin, Ivor J. Vogel, Stefanie N. Hasday, Jeffrey D. Singh, Ishwar S. |
| Description | Country affiliation: United States Author Affiliation: Cooper ZA ( Univ. of Maryland School of Medicine, Health Science Facility-II, Rm. S311, 20 Penn St., Baltimore, MD 21201,USA.) |
| Abstract | We previously showed that exposure to febrile-range temperatures (FRT, 39.5-40 degrees C) reduces LPS-induced TNF-alpha expression, in part through the direct interaction of heat shock factor-1 (HSF1) with the TNF-alpha gene promoter. However, it is not known whether exposure to FRT also modifies more proximal LPS-induced signaling events. Using HSF1-null mice, we confirmed that HSF1 is required for FRT-induced repression of TNF-alpha in vitro by LPS-stimulated bone marrow-derived macrophages and in vivo in mice challenged intratracheally with LPS. Exposing LPS-stimulated RAW 264.7 mouse macrophages to FRT reduced TNF-alpha expression while increasing IL-1beta expression despite the two genes sharing a common myeloid differentiation protein-88 (MyD88)-dependent pathway. Global activation of the three LPS-induced signaling intermediates that lead to cytokine gene expression, ERK and p38 MAPKs and NF-kappaB, was not affected by exposing RAW 264.7 cells to FRT as assessed by ERK and p38 phosphorylation and NF-kappaB in vitro DNA-binding activity and activation of a NF-kappaB-dependent synthetic promoter. However, chromatin immunoprecipitation (ChIP) analysis demonstrated that exposure to FRT reduced LPS-induced recruitment of NF-kappaB p65 to the TNF-alpha promoter while simultaneously increasing its recruitment to the IL-1beta promoter. These data suggest that FRT exerts its effects on cytokine gene expression in a gene-specific manner through distal effects on promoter activation rather than proximal receptor activation and signal transduction. |
| File Format | HTM / HTML |
| ISSN | 03636143 |
| e-ISSN | 15221563 |
| DOI | 10.1152/ajpcell.00346.2009 |
| Journal | American Journal of Physiology - Cell Physiology |
| Issue Number | 1 |
| Volume Number | 298 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2010-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Cell Biology Cytokines Genetics Fever Physiopathology Gene Expression Regulation Physiology Lipopolysaccharides Pharmacology Macrophages Nf-kappa B Promoter Regions, Genetic Tumor Necrosis Factor-alpha Animals Chromatin Crosses, Genetic Dna-binding Proteins Deficiency Drug Effects Interleukin-1beta Mice Mice, Knockout Polymerase Chain Reaction Isolation & Purification Temperature Transcription Factors Research Support, N.i.h., Extramural |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Physiology |
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