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Abstract Title:

trans-Resveratrol, an extract of red wine, inhibits human eosinophil activation and degranulation.

Abstract Source:

Br J Pharmacol. 2008 Dec;155(7):995-1004. Epub 2008 Sep 8. PMID: 18776917

Abstract Author(s):

Y Tan, L H K Lim

Article Affiliation:

Inflammation and Cancer Laboratory, Department of Physiology and NUS Immunology Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.

Abstract:

BACKGROUND AND PURPOSE: trans-Resveratrol, a non-flavonoid polyphenol found abundantly in red wine possesses antiproliferative and anti-inflammatory activity in various inflammatory disease conditions. However, the effect of trans-resveratrol on eosinophil activation in relation to allergy has not been investigated.

EXPERIMENTAL APPROACH: Human eosinophils were isolated and purified from whole blood and incubated for 16 h with trans-resveratrol. Eosinophil chemotaxis, activation and degranulation, and apoptosis were investigated. The effect of trans-resveratrol on the inhibition of p38 and ERK1/2 activation was examined.

KEY RESULTS: Treatment of human eosinophils with trans-resveratrol at concentrations<100 microM for 16 h did not induce eosinophil apoptosis. Similar results were seen after 24 h and 48 h incubations. trans-Resveratrol (<100 microM) significantly inhibited eosinophil peroxidase release after activation with IL-5 (IC(50)=2.9+/-0.9 microM) or C5a (IC(50)=3.9+/-0.5 microM) after 5 min priming with cytochalasin B (CB). Similarly, the production of leukotriene C4 after stimulation with calcium ionophore, and eosinophil chemotaxis in response to eotaxin, as well as CD11b upregulation and CD62 L shedding was also significantly reduced by trans-resveratrol, at concentrations above 5 microM. All the activators induced p38 and ERK1/2 phosphorylation maximal at 2 min of activation. trans-Resveratrol potently inhibited p38 and ERK1/2 activation after calcium ionophore and CB and C5a activation.

CONCLUSIONS AND IMPLICATIONS: trans-Resveratrol is effective at inhibiting human eosinophil activation and degranulation at concentrations<100 microM, while not inducing apoptosis. This potent anti-inflammatory activity of trans-resveratrol and possibly its metabolites on eosinophils may be worth investigating for the treatment of eosinophil-related allergic diseases.

Study Type : In Vitro Study

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