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Fig. 7. Treatment with effective compounds does not affect solubility of PrPc when transport of PrP along the secretory pathway is inhibited. 10 µg/ml Brefeldin A (BFA) were added to the culture medium of wtN2a cells. After 2 hours, cells were exposed to 200 µg/ml suramin, NF449 or NF023 in the presence of BFA and incubated at 37°C overnight. Cells were then harvested and subjected to a solubility assay. Soluble (S) and insoluble (P) fractions were analysed by immunoblotting, using the monoclonal anti-PrP antibody 4H11. Positions of molecular size markers are depicted on the left. Treatment of cells with BFA alone did not affect the solubility of PrPc (lane 3). Treatment with BFA in the presence of suramin, NF449 or NF023 significantly decreased the induction of PrPc aggregates (lanes 7,11 and 15).