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The human red-blood-cell glyoxalase system was modified by incubation with high concentrations of glucose in vitro. Red-blood-cell suspensions (50%, v/v) were incubated with 5 mM- and 25 mM-glucose to model normal and hyperglycaemic glucose metabolism. There was an increase in the flux of methylglyoxal metabolized to D-lactic acid via the glyoxalase pathway with high glucose concentration. The increase was approximately proportional to initial glucose concentration over the range studied (5-100 mM). The activities of glyoxalase I and glyoxalase II were not significantly changed, but the concentrations of the glyoxalase substrates, methylglyoxal and S-D-lactoylglutathione, and the percentage of glucotriose metabolized via the glyoxalase pathway, were significantly increased. The increase in the flux of intermediates metabolized via the glyoxalase pathway during periodic hyperglycaemia may be a biochemical factor involved in the development of chronic clinical complications associated with diabetes mellitus.

Modification of the glyoxalase system in human red blood cells by glucose in vitro