Prostaglandin D2-induced catalepsy in rats: role of 5-hydroxytryptamine

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Abstract
Prostaglandin D2 (PGD2), the major PG in the rat brain, induced a dose-related catalepsy in rats on intracerebroventricular (i.c.v.) administration. This cataleptic response was significantly attenuated following the i.c.v. administration of pharmacological agents that decrease rat brain 5-hydroxytryptamine (5-HT) activity. PGE1 synergized but PGF2α antagonized the catalepsy induced by PGD2. PGD2 and PGE1 have previously been shown to augment rat brain 5-HT activity, whereas PGFα inhibited it. It is therefore likely that the observed effects of these PGs on catalepsy involve a central 5-HT mechanism.