Chronic treatment with typical and atypical antipsychotics increases the AMPA-preferring form of AMPA receptor in rat brain

Lance McCoy, Christopher Cox, Eric K. Richfield

Research output: Contribution to journalArticle


We assessed the effects of chronic (21 day) administration of antipsychotic drags on the density of the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor in rat brain. We used two typical antipsychotic drugs, haloperidol and pimozide, and two atypical antipsychotic drugs, risperidone and clozapine. Antipsychotic drugs as a group significantly elevated the density of the AMPA receptor measured with an AMPA receptor agonist ([3H]AMPA), but not with an AMPA receptor antagonist, 6-cyano-7-nitro-quinoxaline-2,3-dione ([3H]CNQX). In all regions studied, the magnitude of the increase seen with chronic typical antipsychotic drugs was significantly greater than that seen with chronic atypical antipsychotic drugs. In frontal cortex and striatum, typical antipsychotics but not atypical antipsychotics elevated AMPA receptor binding over control. These findings suggest that antipsychotic drugs alter the agonist affinity of the AMPA receptor without altering the number of AMPA receptors. Typical antipsychotic drugs may be more potent in this effect than atypical antipsychotic drugs, especially in critical corticostriatal circuits.

Original languageEnglish (US)
Pages (from-to)41-45
Number of pages5
JournalEuropean Journal of Pharmacology
Issue number1
StatePublished - Dec 27 1996
Externally publishedYes



  • Antipsychotic drug
  • Autoradiography
  • [H]AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid)
  • [H]CNQX (6-cyano-7-nitro-quinoxaline-2,3-dione)

ASJC Scopus subject areas

  • Pharmacology

Cite this