C5a/C5apep-induced ERK1/2 phosphorylation is sensitive to PTX treatment.
A, HEK-293 cells stably expressing C5aR1 were incubated with 100 ng/ml PTX for 12–16 h followed by serum starvation and ligand stimulation. Subsequently, ERK1/2 phosphorylation was measured by Western blotting. B, densitometry-based quantification of data presented in A from three independent experiments normalized with respect to maximal response (treated as 100%) and analyzed using one-way ANOVA. ***, p < 0.001. C, effect of PTX treatment on C5apep-induced ERK1/2 phosphorylation measured as in A above. D, densitometry-based quantification of data presented in C, normalized, and analyzed as in B.