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Behavioral and electroencephalographic effects of excitatory amino acid antagonists and sigma opiate phencyclidine like compounds in rats



Behavioral and electroencephalographic effects of excitatory amino acid antagonists and sigma opiate phencyclidine like compounds in rats



Neuropharmacology 28(1): 57-62



The present work was a comparative study of the electrocortical and behavioural effects of phencyclidine-like drugs and sigma-opiate drugs and of some excitatory amino acid antagonists. Phencyclidine-like drugs and sigma-opiate drugs elicited three dose-dependent electrocortical patterns: 1. Increase of periods of cortical desynchronization 2. Increase of the amplitude of fast (20-30 Hz) cortical waves; 3. Appearance of typical cortical complexes consisting of slow-wave (0.5-2 Hz) sharp-wave complexes. These effects were accompanied by excitatory motor symptoms, such as stereotyped movements of the neck and limbs. The NMDA competitive antagonist D,L-2-amino-5-phosphonovaleric acid (D,L-AP5), administered intracerebroventricularly (0.25-2 .mu.mol), elicited phencyclidine-like stereotyped behaviour and cortical desynchronization, but failed to elicit/sigma typical cortical complexes. The non-selective amino acid antagonist cis-2,3 piperidine dicarboxilic acid (cis 2,3-PDA), administered intraperitoneally (3.3 mmol) failed to elicit both stereotyped behaviour and typical phencyclidine/sigma cortical complexes. The results strongly suggest the hypothesis that a reduction of excitatory amino acid neurotransmission, utilizing N-methyl-d-aspartate (NMDA)-preferring receptors, may be involved in the genesis of phencyclidine/sigma-induced stereotyped behaviour.

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Accession: 007051881

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PMID: 2564646


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