| First Author | Lee HJ | Year | 2007 |
| Journal | Biochem Pharmacol | Volume | 73 |
| Issue | 9 | Pages | 1412-21 |
| PubMed ID | 17229401 | Mgi Jnum | J:122639 |
| Mgi Id | MGI:3714906 | Doi | 10.1016/j.bcp.2006.12.018 |
| Citation | Lee HJ, et al. (2007) Rosmarinic acid inhibits indoleamine 2,3-dioxygenase expression in murine dendritic cells. Biochem Pharmacol 73(9):1412-21 |
| abstractText | Indoleamine 2,3-dioxygenase (IDO), a key enzyme that catalyses the initial and rate-limiting step in the degradation of the tryptophan, is simultaneously expressed in murine dendritic cells and macrophages stimulated with interferon-gamma (IFN-gamma). In the present study, we investigated whether rosmarinic acid (RA), which is suggested to exhibit anti-oxidant and anti-cyclooxygenase properties, could suppress the functional expression of IDO in murine bone marrow-derived dendritic cells (BMDCs) stimulated with IFN-gamma. Treatment with RA reduced intracellular expression of IDO both in IFN-gamma-activated BMDCs in vitro and in CD11c(+)CD8alpha(+) DCs in vivo tumor-bearing mice model. Consequently, we obtained evidence that RA suppresses the functional activity of IDO and blocks the IDO-dependent T cell suppression. In IFN-gamma-mediated induction of IDO transcription, activation of the signal transducer and activator of transcription 1 (STAT1) is important to be express IDO in IFN-gamma-stimulated BMDCs. In this study, we demonstrated that the RA could also suppress IFN-gamma-induced STAT1 activation. These novel findings provide a new insight into that RA as a pharmacological and transcriptional inhibitor of IDO is worthy of clinical application as well as further investigation for IDO regulation. |
