| First Author | Mouawad CA | Year | 2013 |
| Journal | PLoS One | Volume | 8 |
| Issue | 5 | Pages | e64092 |
| PubMed ID | 23717538 | Mgi Jnum | J:200835 |
| Mgi Id | MGI:5509402 | Doi | 10.1371/journal.pone.0064092 |
| Citation | Mouawad CA, et al. (2013) Role of nitric oxide and CCAAT/enhancer-binding protein transcription factor in statin-dependent induction of heme oxygenase-1 in mouse macrophages. PLoS One 8(5):e64092 |
| abstractText | The effect of statins on heme oxygenase-1 (HO-1) was compared in 2 murine cell lines, RAW 264.7 and J774A.1 cell lines, and in primary peritoneal macrophages of BALB/c or C57BL/6 mice. The role of endogenous nitric oxide and the type of transcription factors involved were explored. Simvastatin and fluvastatin induced HO-1. Pretreatment of cells with l-NMMA or 1400 W, two different nitric oxide synthase inhibitors, partially blocked statin-dependent induction of HO-1 in RAW 264.7 and J774A.1 but not in primary peritoneal macrophages. Induction of HO-1 by statins was dependent on p-38 MAP kinase activation in all types of macrophages. In RAW 264.7 cells, both statins increased the activity of reporter genes linked to the proximal 1.3 kbp promoter of HO-1 (EC50 of 1.4+/-0.3 microM for simvastatin and 0.6+/-0.03 microM for fluvastatin). This effect was significantly blocked by 1400 W (80+/-5.2% inhibition, p<0.02) and mevalonate, the direct metabolite of HMGCoA reductase. Gel retardation experiments implicated C/EBPbeta, AP-1 but not USF, for both RAW 264.7 and primary peritoneal macrophages of C57BL/6 mice. Collectively we showed a differential role of endogenous nitric oxide between macrophage cell lines and primary macrophages and an effect of statins in the protection against inflammation by increasing HO-1 expression. |
