Behavioural and electoencephalographic interactions between haloperidol and PCP/sigma ligands in the rat.

Abstract:

:Phencyclidine (PCP) and sigma ligands produce a typical excitatory behaviour in rats, characterized by circling and head- and body-weaving. Excitatory amino acid antagonists such as 2-amino 5-phosphonovaleric acid (AP5) or 3-(+/-)-2-carboxypiperazin-4-yl)propyl-l-phosphonic acid (CPP) also produce a PCP-like excitatory behaviour in rats. In the present paper, the interactions between PCP/sigma drugs or excitatory amino acid receptor antagonists and haloperidol have been investigated in rats. In addition, the influence of two other butyrophenones having a different affinity for the sigma/haloperidol receptors, such as spiperone and 3-(4-(3(4-fluorobenzoyl)-propyl-piperazino-l-yl-isoquinolino (HR 375), has been tested on the behavioural and EEG effects of PCP/sigma drugs and excitatory amino acid antagonists. PCP (2.5-5 mg/kg IP), (+) or (-) SKF 10,047 (1-15 mg/kg IP), (+) or (-) cyclazocine (2-8 mg/kg IP) and AP5 (0.5 mumol ICV) dose-dependently and significantly (P less than 0.01) antagonized the haloperidol-induced catalepsy in the horizontal bar and podium tests in rats. On the other hand, either haloperidol (1 mg/kg IP) or spiperone (1 mg/kg IP) reduced the head-weaving induced by (+) SKF 10,047, PCP, or AP5. On the contrary, HR 375 (6 mg/kg IP) was ineffective in blocking the excitatory effects of these drugs. In addition, either haloperidol (1 mg/kg IP) or spiperone (1 mg/kg IP), but not HR 375 (6 mg/kg IP) reduced the amplitude increase of the fast (20-30 Hz) frequency/low (30-50 microV) voltage background cortical activity elicited by PCP or (+) SKF 10,047. The results demonstrate an interaction between dopamine and excitatory amino acid receptors.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_title

Psychopharmacology

authors

Sagratella S,Scotti de Carolis A,Pèzzola A,Popoli P

doi

10.1007/BF02244368

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

485-91

issue

4

eissn

0033-3158

issn

1432-2072

journal_volume

105

pub_type

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