Popoli P, Benedetti M, Scotti de Carolis A. Influence of nimodipine and diltiazem, alone and in combination, on phencyclidine-induced effects in rats: an EEG and behavioural study.
Eur J Pharmacol 1990;
191:141-8. [PMID:
2086235 DOI:
10.1016/0014-2999(90)94141-j]
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Abstract
The influence of nimodipine and/or diltiazem on the EEG and behavioural effects induced by phencyclidine (PCP) was assessed in adult male Wistar rats. Nimodipine (2 and 10 mg/kg i.p.) and diltiazem (25-100 mg/kg i.p.) significantly potentiated both EEG (increase in background activity voltage, incidence of clustered slow waves) and behavioural (ataxia mean intensity) effects of PCP (5 mg/kg i.p.). A synergistic effect between low, ineffective doses of both nimodipine (0.5 mg/kg i.p.) and diltiazem (5 and 10 mg/kg i.p.) was also found. These data confirm the recent finding of a positive allosteric modulation existing between benzothiazepine (diltiazem) and dihydropyridine (nimodipine) binding sites. They also suggest that the modulation of calcium channels may play a pivotal role in the expression of PCP-induced effects.
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