Biomedical subjects
Publications and source records attributed to N I Andreeva.
The biochemical mechanism of action produced by a new antidepressant pyrazidol (1,10-trimethylene-8-methyl-1, 2, 3, 4-tetrahydropyrazino[1,2-a] indole hydrochloride) includes the inhibitory influence on the neuronal uptake of norepinephrine and a reversible comparatively short-lived inhibitory effect on the MAO activity.
Sera sampled from 2,884 farming animals in the Astrakhan region in 2001 to 2004 were investigated by the hemagglutination inhibition test (HIT) in order to indicate specific antibodies to West Nile virus (WNV). HIT-positive samples were investigated by the neutralization test (NT). WNV antibodies were detected in all the examined species of animals: horses (the proportion of positive tests throughout the observation averaged 9.8%; the agreement with NT results was 94.1%), cattle (6,4 and 72.%), camels (5.2 and 41.7%), pigs (3.1 and 75%), and sheep (2.2 and 57.1). Relationships between the environmental features of WNV in different natural zones, the infection rate, and the conditions of keeping farming animals in the Astrakhan region are analyzed.
The experiments on albino rats demonstrated that antidepressants pyrazidol, imipramine, incazane, moclobemide and to a lesser degree azaphen reduce the amnesic effects of electroshock and scopolamine in the rats with the acquired conditioned reaction of passive avoidance. The studied antidepressants decrease also the disturbing action of alcohol on the learning of rats of the conditioned reaction of active avoidance.
The influence of Soviet-made antidepressants pyrazidol and incazane on some clonidine-induced effects (hypolocomotion, reactions of synchronization and desynchronization in the EEG, aggression) were studied. Pyrazidol and incazane reduce the effects of low doses of clonidine--the hypolocomotor one and the synchronization reaction in the EEG and enhance the effects of a high dose of clonidine--aggression and the desynchronization reaction in the EEG. The reduction of the sedative effects of clonidine as well as the enhancement of its activating effects by antidepressants can reflect the activation of adrenergic transmission by them. The adrenopositive effect of pyrazidol and incazane is more pronounced that that of imipramine.
In experiments on conscious normotensive male Wistar rats the new antidepressants, reversible MAO-A inhibitors, pyrazidole and incazane, as well as moclobemid increased the pressor effect of orally administered tyramine. The drugs potentiated also the pressor effect of intravenous tyramine. More prolonged potentiation of tyramine action was produced by moclobemid, less prolonged by incazane. The potentiation by the studied MAO-A inhibitors of the pressor effect of tyramine reflects the inhibition of the activity of MAO-A and the first-pass metabolism of tyramine in the gut and liver, as well as the inhibition of intraneuronal MAO activity in noradrenergic nerve endings and the potentiation of sympathetic activity.
The effect of an antiallergic (antihistaminic and antiserotonin) drug bicarphen on the functional state of the central nervous system (CNS) was studied. In experiments on animals bicarphen in contrast to dimedrol (diphenhydramine) exerted predominantly the activating effect on CNS (decreased the hypnotic action of barbamyl, enhanced the summation capacity of CNS and the activity of mice in the escape behavioral test, increased the bioelectrical activity of the brain and the activating effect of antidepressants on the EEG).
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Inkazan and pyrazidol given to mice in certain doses were found to reduce the sedative action of diazepam without decreasing its anxiolytic effect but at the same time enhancing the anticonvulsive one. Imipramine diminishes the hypolocomotor action of diazepam and also its anxiolytic effect and exerts no influence on the anticonvulsive effect. All studied antidepressants diminish the hypnotic action on nitrazepam in mice but only inkazan and pyrazidol decrease the sedative-hypnotic effect of nitrazepam in rats. In connection with the lack of the influence on the anxiolytic effect, inkazan and pyrazidol may be used to decrease the sedative side effects of benzodiazepines.
Pharmacological properties of some typical and atypical antidepressants administered repeatedly are more alike as compared to their effects attained after a single administration.
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The effect of new tetracyclic antidepressants pyrazidol and inkazan on adrenergic neurotransmission in the isolated rat vas deferens was studied by examining vas deferens contractions in response to the transmural electric stimulation of the postganglionic sympathetic nerves and addition of noradrenaline (NA) or BaCl2. Pyrazidol and inkazan were found to be capable to increase vas deferens contractions in response to transmural electric stimulation or addition of NA. When given in high concentrations, these antidepressants inhibit the adrenergic neurotransmission since inkazan possesses low sympatholytic activity and pyrazidol exhibits certain alpha-adrenolytic effect.
Ten antidepressants belonging to different chemical classes administered to mice for 5 days have been found to be more similar as regards the pharmacological action as compared to the effects attained with a single drug use.
In experiments with animals pyrasidol, a new Soviet-made tetracyclic antidepressant, lowers the tone and peristalsis of the intestines, reduces cholic acid secretion in the liver and basal gastric secretion to a lesser degree than this does imipramine.
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