Methylglyoxal Alters Glucose Metabolism and Increases AGEs Content in C6 Glioma Cells

Overview

Journal Metab Brain Dis

Publisher Springer

Specialties Endocrinology
Neurology

Date 2012 Jul 18

PMID 22802013

Citations 10

Authors

Fernanda Hansen

Daniela Fraga de Souza

Simone da Luz Silveira

Ana Lucia Hoefel

Julia Bijoldo Fontoura

Ana Carolina Tramontina

Larissa Daniele Bobermin

Marina Concli Leite

Marcos Luiz Santos Perry

Carlos Alberto Goncalves

Affiliations

Soon will be listed here.

Abstract

Methylglyoxal is a dicarbonyl compound that is physiologically produced by enzymatic and non-enzymatic reactions. It can lead to cytotoxicity, which is mainly related to Advanced Glycation End Products (AGEs) formation. Methylglyoxal and AGEs are involved in the pathogenesis of Neurodegenerative Diseases (ND) and, in these situations, can cause the impairment of energetic metabolism. Astroglial cells play critical roles in brain metabolism and the appropriate functioning of astrocytes is essential for the survival and function of neurons. However, there are only a few studies evaluating the effect of methylglyoxal on astroglial cells. The aim of this study was to evaluate the effect of methylglyoxal exposure, over short (1 and 3 h) and long term (24 h) periods, on glucose, glycine and lactate metabolism in C6 glioma cells, as well as investigate the glyoxalase system and AGEs formation. Glucose uptake and glucose oxidation to CO(2) increased in 1 h and the conversion of glucose to lipids increased at 3 h. In addition, glycine oxidation to CO(2) and conversion of glycine to lipids increased at 1 h, whereas the incorporation of glycine in proteins decreased at 1 and 3 h. Methylglyoxal decreased glyoxalase I and II activities and increased AGEs content within 24 h. Lactate oxidation and lactate levels were not modified by methylglyoxal exposure. These data provide evidence that methylglyoxal may impair glucose metabolism and can affect glyoxalase activity. In periods of increased methylglyoxal exposure, such alterations could be exacerbated, leading to further increases in intracellular methylglyoxal and AGEs, and therefore triggering and/or worsening ND.

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