Key result
Chronic haloperidol slows spontaneous dopamine neuron firing via increased functional A-type K+ channels.
Why the study?
Does haloperidol reduce excitability in midbrain dopamine neurons?
Does haloperidol reduce excitability in midbrain dopamine neurons?
Haloperidol produces a delayed dampening of dopamine neuron excitability via upregulation of Kv4.3 K+ channels, providing a mechanistic explanation for the delayed therapeutic effects of antipsychotics.
Answers are grounded in this paper and cite their sources.
Animal data link haloperidol to delayed dopamine neuron suppression via Kv4.3; leaves open human therapeutic relevance.
Antipsychotic drugs require days of treatment to begin to produce therapeutic effects. We report that in vivo treatment with the antipsychotic drug haloperidol acts with a delay of days to slow spontaneous repetitive firing by isolated midbrain dopamine neurons. The decreased excitability is caused by an increased number of functional A-type K+ channels without any change in gating properties. Upregulation of dopamine neuron Kv4.3 mRNA accounts for this effect, demonstrating a role for channel gene expression in this delayed drug action. The resultant long-term dampening of dopamine neuron excitability may serve to tone down the dopamine system.
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Hahn et al. (2003) studied this question. Haloperidol vs. Vehicle was evaluated on Spontaneous repetitive firing and A-type K+ current density in isolated midbrain dopamine neurons. Chronic in vivo treatment with haloperidol acts with a delay of days to slow spontaneous repetitive firing by isolated midbrain dopamine neurons via an increased number of functional A-type K+ channels.
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