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Concentrated Extract of Green Tea Polyphenols Enhances the Toxicity of the Elderberry Lectin Nigrin b to Mice

¹ Nutrición y Bromatología, Facultad de Medicina and CINAD (Centro de Investigación en Nutrición, Alimentación y Dietética Edi- ficio LUCIA-Parque Científico), Universidad de Valladolid, Valladolid, Spain
² Nutrición y Bromatología, Facultad de Medicina and CINAD (Centro de Investigación en Nutrición, Alimentación y Dietética Edi- ficio LUCIA-Parque Científico), Universidad de Valladolid, Valladolid, Spain
³ Nutrición y Bromatología, Facultad de Medicina and CINAD (Centro de Investigación en Nutrición, Alimentación y Dietética Edi- ficio LUCIA-Parque Científico), Universidad de Valladolid, Valladolid, Spain;
⁴ Biología Celular, Histología y Farmacología, Facul- tad de Medicina and INCYL (Instituto de Neurociencias de Castilla y León), Universidad de Valladolid, Valladolid, Spain
⁵ Biología Celular, Histología y Farmacología, Facul- tad de Medicina and INCYL (Instituto de Neurociencias de Castilla y León), Universidad de Valladolid, Valladolid, Spain
⁶ Farmacia y Tecnología Farmacéutica, Facultad de Farmacia and IUFI (Instituto Universitario de Farmacia Industrial), Universidad Complu- tense de Madrid, Madrid, Spain
⁷ Farmacia y Tecnología Farmacéutica, Facultad de Farmacia and IUFI (Instituto Universitario de Farmacia Industrial), Universidad Complu- tense de Madrid, Madrid, Spain
⁸ Nutrición y Bromatología, Facultad de Medicina and CINAD (Centro de Investigación en Nutrición, Alimentación y Dietética Edi- ficio LUCIA-Parque Científico), Universidad de Valladolid, Valladolid, Spain

Food and Nutrition Sciences·Volume 05 (2014)·Pages 466–471·Published 26 February 2014·DOI10.4236/fns.2014.55055

Abstract

The effect of the administration of large amounts of green tea polyphenols is a matter of controversy. We explored whether a polyphenol mixture from a concentrated green tea extract (Polyphenon 60) could alter the effects on mice of the type 2 (two chains) ribosome-inactivating protein nigrin b isolated from Sambucus nigra L. Nigrin b triggers specific reversible toxic effects on the mouse intestines featured by apoptosis of mice Lieberkühn crypt cells upon parenteral administration of sub-lethal amounts. Independent administration to mice of 30 mg/kg body weight of Polyphenon 60 by oral gavage or 10 mg/kg body weight of nigrin b administered via the intraperitoneal route (i.p.) did not affect survival. In contrast, the simultaneous treatment greatly enhanced nigrin b toxicity leading to the death of some animals. The histological analysis revealed that the most serious injury was inflicted on the small intestine crypts, which disappeared, and on the liver, which evidenced hepatotoxicity showing haemorrhagic areas. These findings raise concerns about the abuse of high concentrations of green tea polyphenols especially when the intestinal mucosa is damaged, for instance by toxins or therapeutic drugs.

KeywordsGreen Tea PolyphenolsNigrin b ModelRibosome-Inactivating ProteinLectinSmall IntestineLiverApoptosis

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Concentrated Extract of Green Tea Polyphenols Enhances the Toxicity of the Elderberry Lectin Nigrin b to Mice

Abstract

References (33)