Interaction of pergolide with central dopaminergic receptors.

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Abstract
The activity of pergolide, an N-propylergoline derivative, was tested for stimulation of central dopaminergic receptors. Binding to dopamine receptors shows that pergolide acts as an agonist with respect to the receptors. GTP decreases the potencies of dopamine agonists and of pergolide, but not of bromocriptine, to displace [3H]spiroperidol ([3H]Spi) from striatal membrane sites. The GTP-sensitive site labeled by [3H]Spi seems to be localized on intrastriatal dopamine receptors. The potency of dopamine agonists and of pergolide to displace [3H]Spi from striatal receptor sites is reduced in membranes exposed to higher temperatures. Pergolide, but not dopaminergic ergots, stimulates dopamine-sensitive adenylate cyclase in striatal homogenates. Pergolide, unlike other dopaminergic ergots, acts as an agonist on GTP-sensitive components of [3H]Spi binding and stimulates dopamine receptors linked to dopamine-sensitive adenylate cyclase. The drug induces turning behavior in rats with 6-OH-dopamine lesions and relieves tremor in monkeys [Cercopithecus sabaeus] with ventromedial tegmental lesions for a longer time at a lower dose than other tested dopaminergic ergots. Other studies show that it is effective in the treatment of patients with advanced parkinsonism.