The effects of methylglyoxal on the growth of a line of human melanoma
tells are investigated. Methylglyoxal inhibits cell growth in a dose-
dependent manner and causes an increase in glyceraldehyde 3-phosphate
dehydrogenase, and glyoxalase 1 and glyoxalase 2 specific activities.
The cellular response to increasing concentrations of methylglyoxal in
the culture medium is also studied by measuring L-lactate production,
reduced-oxidized glutathione levels and apoptotic cell death. Methylg
lyoxal seems to promote a change of cell population phenotypic reperto
ire toward a more monomorphic phenotype. In conclusion, methylglyoxal
seems to induce an enzymatic cellular response that lowers methylglyox
al levels and selects the most resistant cells.