Involvement of inducible nitric oxide synthase and cyclooxygenase-2 in the antiinflammatory effects of a red orange extract in human chondrocytes.
In the present study, a complex of compounds (red orange complex, ROC), obtained from three red orange varieties (Citrus sinensis varieties: Moro, Tarocco and Sanguinello), containing cyanidin glycosides, hydroxycinnamic acids, flavanone glycosides and ascorbic acid, was screened to discover new lead compounds in the suppression of the production of key molecules released during inflammatory events in interleukin-1beta (IL-beta) stimulated human primary chondrocytes. The expression of inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX)-2 and intercellular adhesion molecule-1 (ICAM-1), and the release of nitric oxide, prostaglandin (PG)E(2) and interleukin-8 (IL-8) were determined. Indomethacin was used as an anti-inflammatory drug reference. ROC acts as a potent inhibitor of iNOS and COX-2 gene expression while also suppressing the production of PGE(2) and nitrite in human chondrocytes. In addition, ROC induces a significant decrease in ICAM expression and IL-8 release. These findings suggest that ROC exerts anti-inflammatory effects probably through the suppression of COX-2 and iNOS expression.
Nat Prod Res. 2010 Sep;24(15):1469-80
|Printer friendly Cite/link Email Feedback|
|Title Annotation:||Sun Protection|
|Article Type:||Brief article|
|Date:||Jul 1, 2013|
|Previous Article:||Antiinflammatory effects of a red orange extract in human keratinocytes treated with interferon-gamma and histamine.|
|Next Article:||Protective effects of a red orange extract on UVB-induced damage in human keratinocytes.|