Figure 5. Intracellular degradation of carbamylated proteins. Confluent fibroblasts were incubated for 4 weeks at 37°C with DMEM + 0.5% (v/v) FBS and 0.5 mmol/L cyanate in order to induce intracellular protein carbamylation. Cells were then incubated in the same conditions (with 0.5 mM cyanate, solid line) or without cyanate (dotted line) for two additional weeks. HCit content was determined at each time point. The data are presented as means ± SEM (n=6) and the two conditions (with or without cyanate) were compared using the Mann-Whitney U test (**: p<0.01).