Resveratrol Reduces Inflammatory NF-kappaB Gene Signalling

Byron's Comments:

Many nutrients help regulate NF-kappaB to reduce inflammation by modulating gene transcrition, and so does resveratrol. Reducing overall inflammation is an underlying theme for cardiovascular health and health in general.

Study Title:

Suppression of nitric oxide synthase and the down-regulation of the activation of NFkappaB in macrophages by resveratrol.

Study Abstract:

Resveratrol, naringenin and naringin are naturally occurring flavonoids in grapes and grapefruits. The anti-inflammatory effects of these flavonoids have been well documented, but the mechanism is poorly characterized. High concentration of NO are produced by inducible NO synthase (iNOS) in inflammation, and the prevention of the expression of iNOS may be an important anti-inflammatory mechanism. In this study, the effects of these flavonoids on the induction of NO synthase (NOS) in RAW 264.7 cells activated with bacterial lipopolysaccharide (LPS, 50 ng ml(-1)) were investigated. Resveratrol was found strongly to inhibit NO generation in activated macrophages, as measured by the amount of nitrite released into the culture medium, and resveratrol strongly reduced the amount of cytosolic iNOS protein and steady state mRNA levels. However, the inhibitory abilities of naringenin were lower, and the inhibitory abilities of naringin were almost negligible. In electrophoretic mobility shift assays, the activation of NFkappaB induced by LPS for 1 h was inhibited by resveratrol (30 microM). Furthermore, in immunoblotting analysis, cells treated with LPS plus resveratrol showed an inhibition of phosphorylation as well as degradation of IkappaBalpha, and a reduced nuclear content of NFkappaB subunits. The flavonoids may be of value for inhibiting the enhanced expression of iNOS in inflammation through down-regulation of NFkappaB binding activity.

Study Information:

Tsai SH, Lin-Shiau SY, Lin JK. Suppression of nitric oxide synthase and the down-regulation of the activation of NFkappaB in macrophages by resveratrol. Br J Pharmacol. 1996 February 126(3):673-80.
Institute of Biochemistry, College of Medicine, National Taiwan University, Taipei, ROC.

Full Study:

http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=10188978