[Studying the development of imipramine tolerance and prospects of its overcoming with the aid of tianeptine].

Reaction of two groups of mice to sub-chronic imipramine administration has been studied in a series of experiments, where one (control) group received physiological saline instead of imipramine. Then, both groups were randomly divided to receive either tianeptine (two groups) or physiological saline (two groups) for three days. After this period, the reaction of mice to imipramine was assessed again by measuring the immobilization duration in the tail suspension test.

[Experimental study of the effects of citalopram, olanzapine, and their combinations in tests for antipsychotic, antidepressant and anxiolytic activities of drugs].

The effects of citalopram, olanzapine and their combinations were studied in tests on outbred SHR male mice. The locomotor activity was determined in the open field, the antidepressant effects - in the tail suspension test, the anxiety-like behavior- in the light-dark transition test; in addition, the antidopaminergic effects of drugs and their combination were evaluated using the apomorphine-induced stereotypy. The results indicate that olanzapine inhibits locomotor activity in all behavioral tests, whereas citalopram alone has no significant effect and does not modify the action of olanzapine.

Changes in anxiety levels are followed by changes in behavioral strategy in mice subjected to stress and in the extent of stress-induced analgesia.

The experiments reported here demonstrated that corasol increased the extent of analgesia induced by stress and decreased the duration of immobility in mice in a forced swimming test in cold water. Administration of diazepam led to the opposite changes and counteracted the actions of the anxiogen. The effects of the anxiolytic were more apparent in NMRI than mongrel mice, while in mongrel mice the effects of the anxiogen were more marked.

[Is stress-induced analgesia a measure of stress severity?].

When comparing magnitudes of "behavioural despair" (duration of immobility) and stress-induced analgesia in the tail suspension test and cold water swim test with SHR and NMRI male mice. The results might depend on saline injection prior the test and on the fact that exposure to cold water in swim test was sufficient to alter the response patterns. The findings show that the main parameters are closely related to each other.

[A change in the alarm level entails a change in behavioural strategy of mice in stress and a change in analgesia induced by it].

The effects of anxiogenic (pentylentetrazole) and anxiolytic (diazepam) agents on <> and cold swim stress-induced analgesia were investigated in SHR and NMRI male mice. It was shown that behavioral response to acute stress was associated with a change in the pain tolerance threshold. Diazepam increased immobility time and attenuated stress-induced analgesia (SIA).

[Expression of stress-evoked analgesia, connected with activity of animals in a forced swimming test].

The influence of forced swimming on the development of stress-induced analgesia was studied in 35 SHR mice, 65 NMRI mice, and 23 white outbred male rats. Mice were subjected to swimming conditions (at a temperature of 11 degrees C) for a period of 4 minutes and rats for 6 minutes. Pain thresholds were measured by a footshock.

[The influence of calcium channel blockers on the effects of haloperidol and phenamine in mice and rats].

Effects of verapamil (5 and 25 mg/kg), nifedipine (5 and 10 mg/kg), diltiazem (5, 10 and 20 mg/kg), cinnarizine (25 and 50 mg/kg), and fendilin (20 mg/kg) on the haloperidol (3 mg/kg)-induced catalepsy have been studied in rats. In higher doses these drugs attenuate and in lower doses potentiate the action of haloperidol. The bilateral intrastriatal injection of verapamil (5 mcg), diltiazem (5 mcg), and nimodipine (0.

Influence of quinolinic acid, an endogenous neurotoxin, on a passive avoidance conditioned reflex in rats.

Quinolinic acid, an endogenous neurotoxin, was introduced into the cerebral ventricles of a rat in doses of 0.5 microgram and 30 micrograms. The influence of the substance on the reproduction of a passive avoidance conditioned reflex (CR) was evaluated.

[Disorders in the behavioral development of rats in ontogeny after a single administration of quinolinic acid].

Repetitive administration of quinolinic acid (QUIN, 50 mg/kg) induced generalized seizures only in 11-12, but not in 2-3, or 5-6 day rat puppies. Behavioural patterns characterizing postnatal development were registered within 3 months. Hyperactivity, increased thresholds for nociceptive reaction, as well as a the impairment of memory and learning were found in rats treated with QUIN at the age of 5-6 days.

[Changes in neurovegetative regulation in the Tourette syndrome (according to ECG findings)].

The authors compared the ECG patterns in 13 patients with Tourette's syndrome (TS) and in 9 patients with temporal epilepsy before and after the administration of atropine. It was found that slowing down of the cardiac rhythm in patients with TS is caused by the prolongation of the period of electrical diastole TP. The P wave was significantly depressed while the T wave was somewhat elevated.

[Features of the temporal structure of the respiratory cycle in the Tourette syndrome as a possible reflection of intensified dopaminergic processes].

The effect of dopamine blockers (chlorpromazine and haloperidol) and the dopaminomimetic piribedil on the structure of the breathing cycle was studied under conditions of the clinical employment of the drugs. It was found that piribedil increased the inspiration fraction (IF) in the respiratory cycle whereas neuroleptics diminished it. Twenty-six children with Tourette's syndrome (TS) and 24 with a temporal form of epilepsy were examined.

[Various aspects of the pathophysiology of the Tourette syndrome].

The duration of the R-R cardiointerval (CI) in 13 patients with Tourette's syndrome (TS) aged 9 to 17 years proved to be significantly (+17%; p less than 0.001) longer than in 27 patients of the same age with other neuropsychiatric diagnoses (temporal epilepsy, schizophrenia, neurosis, residual organics) and when compared with the normal values for the respective age (+16.2%; p less than 0.