Figure 4From: Decreased catalytic function with altered sumoylation of DNA topoisomerase I in the nuclei of scleroderma fibroblastsReal-time RT-PCR and Western blots for SUMO1 with and without SUMO1 siRNA transfection in fibroblasts. Three SSc fibroblast strains (two with anti-topo I and one with anti-RNA polymerase III positive serum) were transfected with SUMO1 siRNA. After 48-hour transfection, total RNAs were used for measuring SUMO1 transcript levels (Figure 4a), and the nuclear extracts were used for measuring SUMO1 protein (Figure 4b). Error bars indicate standard deviation.Back to article page