論文 - 詳細
| RRC ID | 1204 |
|---|---|
| 著者 | Kizaki T, Suzuki K, Hitomi Y, Taniguchi N, Saitoh D, Watanabe K, Onoé K, Day NK, Good RA, Ohno H. |
| タイトル | Uncoupling protein 2 plays an important role in nitric oxide production of lipopolysaccharide-stimulated macrophages. |
| ジャーナル | Proc Natl Acad Sci U S A |
| Abstract |
The expression of uncoupling protein 2 (UCP2) was reduced in macrophages after stimulation with lipopolysaccharide (LPS). The physiological consequence and the regulatory mechanisms of the UCP2 down-regulation by LPS were investigated in a macrophage cell line, RAW264 cells. UCP2 overexpression in RAW264 cells transfected with eukaryotic expression vector containing ucp2 cDNA markedly reduced the production of intracellular reactive oxygen species. Furthermore, in the UCP2 transfectant, nitric oxide (NO) synthesis, inducible NO synthase (NOS II) protein, NOS II mRNA, and NOS II promoter activity were definitely decreased after LPS stimulation compared with those in parental RAW264 or RAW264 cells transfected with the vector alone. Reporter assays suggested that an enhancer element was located in the region of intron 2 of the UCP2 gene and that the UCP2 expression was down-regulated not by the 7.3-kb promoter region but by the 5' region of the UCP2 gene containing two introns. Deletion of intron 2 resulted in the low transcriptional activities and abolishment of the LPS-associated negative regulation. In addition, the mRNA expression of transfected UCP2 was suppressed in RAW264 cells transfected with expression vector containing UCP2 genomic DNA, but was markedly increased in cells transfected with the vector containing UCP2 intronless cDNA. These findings suggest that the LPS-stimulated signals suppress UCP2 expression by interrupting the function of intronic enhancer, leading to an up-regulation of intracellular reactive oxygen species, which activate the signal transduction cascade of NOS II expression, probably to ensure rapid and sufficient cellular responses to a microbial attack. |
| 巻・号 | 99(14) |
| ページ | 9392-7 |
| 公開日 | 2002-7-9 |
| DOI | 10.1073/pnas.142206299 |
| PII | 142206299 |
| PMID | 12089332 |
| PMC | PMC123151 |
| MeSH | Animals Base Sequence Cell Line DNA, Complementary / genetics Down-Regulation / drug effects Introns Ion Channels Lipopolysaccharides / pharmacology* Macrophages / drug effects* Macrophages / metabolism* Membrane Transport Proteins* Mice Mitochondrial Proteins* Mutagenesis, Site-Directed Nitric Oxide / biosynthesis* Nitric Oxide Synthase / genetics Nitric Oxide Synthase / metabolism Nitric Oxide Synthase Type II Promoter Regions, Genetic Proteins / genetics Proteins / metabolism* RNA, Messenger / genetics RNA, Messenger / metabolism Signal Transduction Transfection Uncoupling Protein 2 |
| IF | 9.412 |
| 引用数 | 106 |
| WOS 分野 | BIOCHEMISTRY & MOLECULAR BIOLOGY |
| オルトメトリクス指標 |
オルトメトリクス指標項目
|
| 最多言及媒体 | F1000Research |
| 各媒体での言及数の合計 | 2 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| ヒト・動物細胞 | RAW 264(RCB0535) |