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Partial dopamine agonists showing high affinity but low efficacy at D2 receptors can act as dopaminergic "buffers," reducing dopaminergic activity when it is excessive, and promoting it when reduced. This makes them of interest as potential therapeutic agents for the treatment of both positive and negative symptoms in schizophrenia, where they should also result in fewer or less severe motor disturbances than classical neuroleptics. SDZ 208-911 and SDZ 208-912 are amino-ergolines exhibiting partial agonistic properties in the rat, where they inhibit apomorphine-induced stereotypies, are only weakly cataleptogenic, induce varying degrees of circling behavior after unilateral lesioning of the nigrostriatal pathway, and strongly suppress prolactin secretion. The least agonistically acting agent, SDZ 208-912, should be effective against positive symptoms, whereas SDZ 208-911 could be suitable for the treatment of negative symptoms. In addition to possible therapeutic effects, the clinical testing of this class of agent should help to elucidate the status of central dopaminergic function in schizophrenic psychosis.
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