1. S-D-Lactoylglutathione accumulates in human platelets activated by agonists. Among the tested inducers thrombin is the most active. 2. The effect is dose and time-dependent. S-D-Lactoylglutathione, corresponding to depleted pool of reduced glutathione, can also be detected in platelets incubated with exogenous methylglyoxal. 3. A further significant increase was observed in platelets stimulated with thrombin in the presence of methylglyoxal. 4. No change in glyoxalase activities upon platelet stimulation with thrombin was shown.
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