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Vibrio vulnificus cytolysin has been incriminated as one of the important virulence determinants in V. vulnificus infection. In the present study, the effects of Vibrio vulnificus cytolysin on platelets were examined. Vibrio vulnificus cytolysin induced platelet aggregation and increased intracellular calcium concentration ($[Ca^{2+}]_i$) of rat platelets. These effects were abolished in $Ca^{2+}-free$ buffer (2 mM EGTA). Cytolysin also potentiated ADP-and collagen-induced platelet aggregation. Lanthanum (2 mM) inhibited cytolysin-diduced platelet aggregation. However, another $Ca^{2+}$ channel blockers, verapamil ($20{\;}{\mu}M$) or mefenamic acid ($20{\;}{\mu}M$) did not block cytolysin-induced platelet aggregation. Osmotic protectants, sucrose (50 mM) and raffinose (50 nM) suppressed platelet aggregation by 35.9% and 63.4%, respectively. V. vulnificus cytolysin increased membrane conductances of platelet membranes. These results suggest that cytolysin-induced platelet aggregation is mediated via lanthanum sensitive-calcium influx which resulted from the pore formation by V. vulnificus cytolysin.
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