Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Protection of Polyphenols Against Glyco-Oxidative Stress: Involvement of Glyoxalase Pathway

Version 1 : Received: 14 September 2020 / Approved: 17 September 2020 / Online: 17 September 2020 (07:45:11 CEST)

How to cite: Cianfruglia, L.; Morresi, C.; Bacchetti, T.; Armeni, T.; Ferretti, G. Protection of Polyphenols Against Glyco-Oxidative Stress: Involvement of Glyoxalase Pathway. Preprints 2020, 2020090383 (doi: 10.20944/preprints202009.0383.v1). Cianfruglia, L.; Morresi, C.; Bacchetti, T.; Armeni, T.; Ferretti, G. Protection of Polyphenols Against Glyco-Oxidative Stress: Involvement of Glyoxalase Pathway. Preprints 2020, 2020090383 (doi: 10.20944/preprints202009.0383.v1).

Abstract

Chronic high glucose (HG) exposure increases methylglyoxal (MG)-derived AGEs and is involved in the onset of pathological conditions, such as diabetes, atherosclerosis and chronic‐degenerative diseases. Under physiologic condition the harmful effects of MG are contrasted by glyoxalase system that is involved in the detoxification of Reactive Carbonyl Species (RCS) and maintain the homeostasis of the redox environment of the cell. Polyphenols are the most abundant antioxidants in the diet and present various health benefits. The study aimed at investigating the role of polyphenols extracted from an apple high in polyphenols (Calville White Winter), on glyco-oxidative stress induced by chronic HG-exposure. Intestinal Caco-2 cells were treated in physiological glucose condition (25mM) as a control and in HG condition (50mM) with or without apple extract for one week. Our data demonstrated that HG-treatment triggers glyco-oxidation stress with a significantly increase in ROS, lipid peroxidation, AGEs and Glyoxalase I (GlxI) activity with a significant decrease in total antioxidant intracellular defense. Treatment with polyphenols under HG condition restores to the control levels GlxI activity, decreases Glyoxalase II (GlxII) in relation to the control and induces a drop of glyco-oxidative damage. This paper seeks to highlight the roles of polyphenols in glyco-oxidative stress.

Subject Areas

Methylglyoxal; Glyoxalase system; AGEs; glutathione; hyperglycemia

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