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. 1998 May;26(3):173–183. doi: 10.1023/A:1007953628840

Incidence and potential implications of the toxic metabolite methylglyoxal in cell culture: A review

Frank WR Chaplen 1
PMCID: PMC3449548  PMID: 22358615

Abstract

Methylglyoxal is a toxic metabolite unavoidably produced in mammalian systems as a by-product of glycolysis. Detoxification of this compound occurs principally through the glyoxalase pathway, which consists of glyoxalase I and glyoxalase II, and requires reduced glutathione as a co-enzyme. Recently, it has been demonstrated that variations in glucose, glutamine and fetal bovine serum levels can cause significant changes in the intracellular concentration of methylglyoxal. More importantly, comparative studies involving wild-type Chinese hamster ovary cells and clones overexpressing glyoxalase I indicate that glucose and glutamine, within the range normally found in cell culture media, can cause decreased cell viability mediated solely through increased production of methylglyoxal. In addition, endogenously produced methylglyoxal has been shown to cause apoptosis in cultured HL60 cells. While the exact mechanism of the impact of methylglyoxal on cultured cells is unknown, methylglyoxal is a potent protein and nucleic acid modifying agent at physiological concentrations and under physiological conditions. Protein modification occurs mainly at arginine, lysine and cysteine residues and is believed to be an important signal for the degradation of senescent proteins. Modification of arginine and lysine results in the irreversible formation of advanced glycation endproducts, whereas modification of cysteine results in the formation of a highly reversible hemithioacetal. Methylglyoxal also forms adducts with nucleic acids, principally with guanyl residues. At high extracellular concentrations, it is genotoxic to cells grown in culture. Even at physiological concentrations (100 nM free methylglyoxal), methylglyoxal can modify unprotected plasmid DNA and cause gene mutation and abnormal gene expression.

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