Quercetin reduces markers of oxidative stress and inflammation in sarcoidosis

Agnes W. Boots*, Marjolein Drent, Vincent C.J. de Boer, Aalt Bast, Guido R.M.M. Haenen

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    139 Citations (Scopus)


    Background & aims: Oxidative stress and low antioxidant levels are implicated in the aetiology of sarcoidosis, an inflammatory disease. Quercetin is a potent dietary antioxidant that also displays anti-inflammatory activities. Consequently, the aim is to examine the effect of quercetin supplementation on markers of oxidative stress and inflammation in sarcoidosis. Methods: A double-blind intervention study has been conducted with two groups of non-smoking, un-treated sarcoidosis patients, matched for age and gender. One group was given 4x500 mg quercetin (n = 12) orally within 24 h, the other one placebo (n = 6). Plasma malondialdehyde levels were used as marker of oxidative damage, plasma ratios of TNFα/IL-10 and IL-8/IL-10 as pro-inflammatory markers. Results: Quercetin supplementation improved the antioxidant defence, indicated by the increased total plasma antioxidant capacity. Moreover, quercetin supplementation also reduced markers of oxidative stress and inflammation in the blood of sarcoidosis patients. The effects of quercetin supplementation appeared to be more pronounced when the levels of the oxidative stress and inflammation markers were higher at baseline. Conclusions: Sarcoidosis patients might benefit from the use of antioxidants, such as quercetin, to reduce the occurring oxidative stress as well as inflammation. The effects of long-term use of antioxidant supplementation in sarcoidosis, using e.g. quercetin, on improvement of lung function remain to be investigated. (www.clinicaltrials.gov; NCT-00402623).
    Original languageEnglish
    Pages (from-to)506-512
    Number of pages7
    JournalClinical Nutrition
    Issue number4
    Publication statusPublished - Aug 2011


    • Antioxidant supplementation
    • Cytokines
    • Interstitial lung disease
    • Oxidative damage


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