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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Induction of inflammatory mediator release (serotonin and 12-hydroxyeicosatetraenoic acid) from human platelets by Pseudomonas aeruginosa glycolipid.

Purified glycolipid from Pseudomonas aeruginosa induced the generation of significant amounts of 12-hydroxyeicosatetraenoic acid (12-HETE) and serotonin release from human platelets. The release of serotonin was first observed 2 min after addition of the glycolipid and increased with time. Significant serotonin release was obtained at glycolipid concentrations above 5 micrograms/ml and increased dose-dependently up to 100% at glycolipid concentrations above 40 micrograms/ml. Glycolipid induced 12-HETE in a time- and dose-dependent manner. 12-HETE formation was first measured after 10 min of incubation and increased with time. Optimal 12-HETE formation was obtained at a glycolipid concentration of 50 micrograms/ml; higher concentrations of glycolipid led to a decrease in 12-HETE formation, indicating a cytotoxic effect. Stimulation of platelets with glycolipid (12-HETE formation and serotonin release) was accompanied by calcium influx, translocation of protein kinase C, activation of guanylylimidodiphosphate binding, and increased GTPase activity in platelet membranes within the same concentration range.[1]


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