Carbonyl stress and NMDA receptor activation contribute to methylglyoxal neurotoxicity

de Arriba, SG; Krugel, U; Regenthal, R; Vissiennon, Z; Verdaguer, E; Lewerenz, A; Garcia-Jorda, E; Pallas, M; Camins, A; Munch, G; Nieber, K; Allgaier, C

Abstract

Methylglyoxal (MG) is a reactive a-ketoaldehyde physiologically generated as a by-product of glycolysis. MG that is able to form protein adducts resulting in advanced glycation end products accumulates under conditions associated with neurodegeneration such as impaired glucose metabolism or oxidative stress. In the present study, short-term exposure of human neuroblastoma SH-SY5Y cells to MG was associated with an early depolarization of the plasma membrane, glutamate release, and formation of reactive oxygen species. In addition, long-term exposure (24 h) of SH-SY5Y cells to MG caused a decrease in cell viability, intracellular ATP, and rhodamine 123 (Rh-123) fluorescence. ATP depletion and the decrease in Rh-123 fluorescence were prevented by carbonyl scavengers, the nitric oxide synthase inhibitor L-NAME, and N-methyl-D-aspartate (NMDA) receptor antagonists. Furthermore, the MG-induced glutamate release and the loss in cell viability were prevented by NMDA receptor antagonists. Therefore, MG renders cells more vulnerable to excitotoxicity. In conclusion, carbonyl scavengers as well as NMDA receptor antagonists may represent effective therapeutic tools to reduce the risk of pathophysiological changes associated with carbonyl stress in neurodegenerative diseases. (c) 2005 Elsevier Inc. All rights reserved.

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Título según WOS: ID WOS:000236426300005 Not found in local WOS DB
Título de la Revista: FREE RADICAL BIOLOGY AND MEDICINE
Volumen: 40
Número: 5
Editorial: Elsevier
Fecha de publicación: 2006
Página de inicio: 779
Página final: 790
DOI:

10.1016/j.freeradbiomed.2005.09.038

Notas: ISI