Oncotarget

Research Papers: Gerotarget (Focus on Aging):

Epigallocatechin gallate affects glucose metabolism and increases fitness and lifespan in Drosophila melanogaster

Anika E. Wagner, Stefanie Piegholdt, Doerte Rabe, Nieves Baenas, Anke Schloesser, Manfred Eggersdorfer, Achim Stocker _ and Gerald Rimbach

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Oncotarget. 2015; 6:30568-30578. https://doi.org/10.18632/oncotarget.5215

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Abstract

Anika E. Wagner1, Stefanie Piegholdt1, Doerte Rabe1, Nieves Baenas1,2, Anke Schloesser1, Manfred Eggersdorfer3, Achim Stocker4, Gerald Rimbach1

1Institute of Human Nutrition and Food Science, University of Kiel, Kiel, Germany

2Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), Campus Universitario de Espinardo, Murcia, Spain

3DSM Nutritional Products, Basel, Switzerland

4Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland

Correspondence to:

Anika E. Wagner, e-mail: wagner@molecularnutrition.uni-kiel.de

Gerald Rimbach, e-mail: rimbach@foodsci.uni-kiel.de

Keywords: Gerotarget, epigallocathechin-3-gallate, green tea, life span, Drosophila melanogaster

Received: July 07, 2015     Accepted: August 28, 2015     Published: September 08, 2015

ABSTRACT

In this study, we tested whether a standardized epigallocatechin-3-gallate (EGCG) rich green tea extract (comprising > 90% EGCG) affects fitness and lifespan as well as parameters of glucose metabolism and energy homeostasis in the fruit fly, Drosophila melanogaster. Following the application of the green tea extract a significant increase in the mean lifespan (+ 3.3 days) and the 50% survival (+ 4.3 days) as well as improved fitness was detected. These effects went along an increased expression of Spargel, the homolog of mammalian PGC1α, which has been reported to affect lifespan in flies. Intriguingly, in flies, treatment with the green tea extract decreased glucose concentrations, which were accompanied by an inhibition of α-amylase and α-glucosidase activity. Computational docking analysis proved the potential of EGCG to dock into the substrate binding pocket of α-amylase and to a greater extent into α-glucosidase. Furthermore, we demonstrate that EGCG downregulates insulin-like peptide 5 and phosphoenolpyruvate carboxykinase, major regulators of glucose metabolism, as well as the Drosophila homolog of leptin, unpaired 2. We propose that a decrease in glucose metabolism in connection with an upregulated expression of Spargel contribute to the better fitness and the extended lifespan in EGCG-treated flies.


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