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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Cherry, Anne D. Bartz, Raquel R. Suliman, Hagir B. Piantadosi, Claude A. |
| Description | Author Affiliation: Cherry AD ( From the Departments of Anesthesiology, Medicine and Pathology, Duke University Medical Center, Durham, North Carolina 27710.) |
| Abstract | A key transcriptional regulator of cell metabolism, the peroxisome proliferator-activated receptor γ co-activator 1- (PPARGC-1- or PGC-1 ), also regulates mitochondrial biogenesis, but its role in antioxidant gene regulation is not well understood. Here, we asked whether genetic heterozygosity of PGC-1 modulates gene expression for the mitochondrial antioxidant enzyme SOD-2 during hepatic inflammatory stress. Using Staphylococcus aureus peritonitis in mice, we found significant Sod2 gene induction in WT mice, whereas PGC-1 heterozygotes (PGC-1 (+/-)) failed to augment Sod2 mRNA and protein levels. Impaired Sod2 regulation in PGC-1 (+/-) mice was accompanied by oxidative stress shown by elevated mitochondrial GSSG/GSH and protein carbonyls. In silico analysis of the mouse proximal Sod2 promoter region revealed consensus binding sites for the Nfe2l2 (Nrf2) transcription factor. Chromatin immunoprecipitation demonstrated diminished Nfe2l2 protein binding to the antioxidant response element promoter site proximal to the Sod2 start site in PGC-1 heterozygous mice, implicating PGC-1 in facilitation of Nfe2l2 DNA binding. Nuclear protein co-immunoprecipitation demonstrated an interaction between hepatic Nfe2l2 and PGC-1 in WT mice that was greatly reduced in PGC-1 (+/-) mice. The data indicate that PGC-1 promotes mitochondrial antioxidant enzyme expression through Nfe2l2-mediated SOD-2 expression in sepsis. The presence of this new PGC-1 -dependent signaling axis indicates that PGC-1 opposes mitochondrial oxidative stress by means of selective induction of one or more antioxidant response element-driven genes. By implication, exploitation of this axis could lead to new pharmacological interventions to improve the antioxidant defenses during oxidative stress-induced mitochondrial damage. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 1 |
| Volume Number | 289 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2014-01-03 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Liver Metabolism Mitochondria, Liver Oxidative Stress Sepsis Staphylococcal Infections Staphylococcus Aureus Transcription Factors Animals Gene Expression Regulation, Enzymologic Genetics Pathology Mice Mice, Mutant Strains NF-E2-Related Factor 2 Peritonitis Response Elements Signal Transduction Superoxide Dismutase Biosynthesis Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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