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Action of fibrinopeptides A and B on the central dopaminergic system of rats pretreated with indomethacin.

Fibrinopeptides A and B (FAB) stimulate central dopamine neurons. Inhibition of prostaglandin synthesis by administration of indomethacin potentiated the stimulatory action of FAB on apomorphine stereotypy, while induced inhibitory action of FAB on amphetamine stereotypy. Results of studies on the level and turnover of dopamine do not explain the changes in the stereotyped behavior. The data suggest that prostaglandins may to some extent participate in the mechanism of the central action of FAB.