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Suppressive effects of flavonoids on dioxin toxicity
1Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Japan.
Biofactors (Oxford, England)
|February 24, 2001
Summary
Flavonoids found in plant-based diets can block the toxic effects of dioxins like TCDD. These compounds act as antagonists to the aryl hydrocarbon receptor (AhR), preventing its harmful transformation and mitigating dioxin toxicity in humans.
Area of Science:
- Environmental Toxicology
- Nutritional Biochemistry
- Molecular Pharmacology
Background:
- Dioxins, such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), induce toxicity through binding to the aryl hydrocarbon receptor (AhR).
- Suppression of AhR transformation by dietary factors offers a potential strategy to counteract dioxin toxicity.
Purpose of the Study:
- To investigate the potential of dietary flavonoids to inhibit TCDD-induced AhR transformation.
- To determine the efficacy of various flavonoids as antagonists of the aryl hydrocarbon receptor.
Main Methods:
- Rat cytosolic fractions containing AhR were treated with varying concentrations of flavonoids prior to the addition of 1 nM TCDD.
- Electrophoretic mobility shift assay (EMSA) was employed to detect transformed AhR using a dioxin response element DNA probe.
Main Results:
- Flavones and flavonols demonstrated antagonistic activity against AhR transformation at dietary levels.
- The calculated IC50 values for these flavonoid antagonists ranged from 0.14 to 10 microM, indicating efficacy at physiologically relevant concentrations.
Conclusions:
- Dietary flavonoids, specifically flavones and flavonols, can effectively suppress TCDD-induced AhR transformation.
- These findings suggest that a diet rich in plant-based foods may offer protection against dioxin toxicity.