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In spite of intensive research, the problem of treating antidepressant-resistant depressive patients has not yet been solved. The authors previously reported that combined administration of imipramine and the uncompetitive NMDA receptor antagonist amantadine reduced immobility time in the forced swimming test in rats to a much greater extent than either(More)
Venlafaxine (VEN) is a representative of a new class of antidepressants (SNRIs) which inhibit selectively the uptake of serotonin and noradrenaline, but--in contrast to tricyclics--show no affinity for neurotransmitter receptors. The present study was aimed at determining whether repeated VEN (given twice daily for 14 days) induced adaptive changes in the(More)
The effects of MK-801, a non-competitive NMDA receptor antagonist, and of antidepressant drugs were studied in the forced swimming test in rats. MK-801 reduced immobility time. Combined treatment with MK-801 + imipramine induced a stronger effect in Porsolt's test than administration of either drug alone. Citalopram was inactive when given alone but it(More)
The present study examined the effects of CGP 37849 and CGP 39551, competitive NMDA receptor antagonists, in the forced swimming test in rats and mice. Administered in a single dose or three times both examined compounds reduced the immobility time in rats. Active doses used in that test either did not change the locomotor activity or decreased it. A(More)
The present study examined the effects of acute and repeated administration of three antidepressant drugs (imipramine, citalopram and (+)-oxaprotiline) on the levels of mRNA coding for dopamine D1 and D2 receptors in the rat brain. Quantitive in situ hybridization with 35S-labelled oligonucleotide probes has been utilised. The level of mRNA coding for(More)
The action of m-trifluoromethylphenylpiperazine (TFMPP) and m-chlorophenylpiperazine (m-CPP), inhibiting the exploratory activity (ambulation and peeping) of the rat was studied in the open field test. The effects of both these drugs were antagonized by mesulergine, metergoline and mianserin, and partly by methysergide. Spiperone showed an antagonistic(More)
The effect of the calcium channel antagonists nifedipine, nimodipine, and diltiazem (10 mg/kg PO) was studied after single and repeated administration to rats. All the compounds administered repeatedly reduced significantly the duration of immobility in the forced swimming test. At the same time the locomotor activity of rats was reduced (nifedipine,(More)
Previous studies have indicated that antidepressant drugs displaying different pharmacological profiles, administered repeatedly, increase the locomotor hyperactivity induced by various dopaminomimetics, among others by quinpirole. As this drug, according to a recent study, shows high affinity not only for dopamine D2 but also for dopamine D3 receptors, the(More)
The effect of the calcium channel antagonists nifedipine, nitrendipine, nimodipine, verapamil and diltiazem in the mouse behavioral despair test was investigated. The dihydropyridine calcium channel antagonists nifedipine, nitrendipine, nimodipine (0.1, 1, 10 mg/kg p.o.) but not the non-dihydropyridine compounds verapamil or diltiazem, dose dependently(More)
Behavioural and some neurochemical effects of Ro 40-7592 (3,4-dihydroxy-4'-methyl-5-nitrobenzophenone), a new COMT inhibitor, were studied in rats and mice. Ro 40-7592 increased the effect of L-DOPA (plus benserazide) on locomotor activity, reserpine-induced hypothermia, and catalepsy induced by pimozide, haloperidol and fluphenazine. Locomotor(More)