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The effects of intravenous administration of prostaglandins (PGs) were investigated in genetically narcoleptic Doberman pinschers. The treatment of narcoleptic dogs with PGE2 and PGE2 methyl ester, but not PGD2 and PGD2 methyl ester, induced a dose-dependent reduction of canine cataplexy, a dissociated manifestation of rapid-eye-movement sleep. The effect was specific and not associated with any change in other behavior. Furthermore, the effect was long-lasting (up to 2 hr) and could not be explained by the acute cardiovascular changes seen after intravenous PG administration. PGE2 methyl ester, a lipophilic derivative of PGE2 with more central penetration than PGE2, was 4 times more potent than PGE2. These results indicate that PGE2 modifies cataplexy through a central effect and suggest that this prostaglandin may play a role in rapid-eye-movement sleep regulation.

Prostaglandin E2 and its methyl ester reduce cataplexy in canine narcolepsy.