P-selectin-mediated adhesion between endothelium and neutrophils is a crucial process leading to acute
inflammatory injure. Thus, P-selectin has been considered as promising target for therapeutics of acute
inflammatory-related diseases. In the present study, the water-soluble polysaccharides (BCPs) were isolated
from Bupleurum chinense, and we evaluated their therapeutical effects on acute inflammatory
injure and antagonistic function against P-selectin-mediated neutrophil adhesion. Our results showed
that BCPs significantly impaired the leukocyte infiltration and relieve lung injury in LPS-induced acute
pneumonia model. BCPs significantly blocked the binding of P-selectin to neutrophils and inhibited Pselectin-mediated
neutrophils rolling along CHO-P cellmonolayer. The resultfromin vitro protein binding
assay showed a direct evidence indicating that BCPs-treatment significantly eliminated the interaction
betweenrhP-Fc and its physiological ligand PSGL-1 at proteinlevel. Together,these results provide anovel
therapeutical strategy for amelioration of inflammation-related disease processes by polysaccharides
from B. chinense.