Effects of the PCP analog dizocilpine on sensory gating: Potential relevance to clinical subtypes of schizophrenia

Hassen A. Al-Amin, Steven B. Schwarzkopf

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Abstract

Prepulse inhibition (PPI) of the acoustic startle reflex, a measure of sensory gating, is reduced in schizophrenic patients. Dopamine agonists and NMDA receptor antagonists such as phencyclidine (PCP) can disrupt PPI in animals, consistent with both the dopamine and glutamate hypotheses of schizophrenia. In this study, we sought to further characterize the effects of the NMDA antagonist dizocilpine on acoustic startle modulation. Fischer 344 rats were tested after one of three doses of dizocilpine (0.05, 0.2, and 0.5 mg/kg) and assessed for PPI as well as for alterations in baseline startle and prepulse facilitation (PPF). Results showed complete disruption of PPI for each inhibitory trial type afer 0.2 and 0.5 mg/kg of dizocilpine. Baseline startle and PPF were enhanced by the low dose but decreased with the moderate and high doses of dizocilpine. Although dizocilpine caused alterations in prepulse modulation of startle similar to dopamine agonists, some effects differ. Unique effects of dizocilpine on sensory gating are discussed in terms of their potential for discriminating subtypes of schizophrenic illness with different underlying pathophysiology.

Original languageEnglish
Pages (from-to)744-754
Number of pages11
JournalBiological Psychiatry
Volume40
Issue number8
DOIs
Publication statusPublished - 15 Oct 1996

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Keywords

  • acoustic startle reflex
  • animal models
  • dizocilpine
  • prepulse facilitation
  • prepulse inhibition

ASJC Scopus subject areas

  • Biological Psychiatry

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