1. Methylglyoxal by depleting glutathione stores increased Trypan-blue
uptake by the cells incubated in glucose, pyruvate and amino acids fr
ee medium. 2. Only a transient fall of glutathione concentration witho
ut any effect on cell viability was caused by methylglyoxal when the m
edium was supplemented with above-mentioned compounds. 3. The role of
gamma-glutamyl-transpeptidase is discussed.