PubMed Health⌕ Search

Biomedical subjects

V I Votiakov

Publications and source records attributed to V I Votiakov.

142 records · Page 8Linked to original sources
PubMedDate not supplied

[Effect of the physiological state of ticks on the intensity of tick-borne encephalitis virus replication in them].

The features of tick-borne encephalitis (TBE) virus reproduction in Ixodes ricinus and Dermacentor anderson ticks were studied in relation to the age of ticks, duration of fasting, feeding, and conditions of keeping the ticks before and after the experiment. Parenteral infection of ticks at various intervals after molting showed that the most favourable conditions for reproduction, survival, transphase and transovarial transmission of the virus occurred when the virus was given to the ticks in the first days after the period of postlarval development followed by feeding the vectors on vertebrates. In this case, owing to increased metabolic activity and intensive organogenesis and histogenesis, the virus persisted in ticks in high titers till the moment of oviposition and penetrated into the egg batch. When the virus was inoculated into old exhausted females (8-18 months) virus titers in ticks were low and penetration of the virus into the egg batch was irregular.

Animals↗
PubMedDate not supplied

[Experimental amyotrophic leukospongiosis].

Experimental amyotrophic leukospongiosis (ALSP) has first been reproduced in 2 squirrel monkeys 16 and 23 months after inoculation of the animals with a brain suspension from the patient who had died of this disease. From the brain cell cultures of the monkeys a hemadsorbing agent was isolated which induced cell proliferation and was inhibited by the antisera from patients with ALSP.

Animals↗
PubMedDate not supplied

[Factors affecting plaque formation by Lassa virus in Vero cells].

The method of Porterfield and Allison was adapted for titration of the infectious activity of Lassa virus by the plaque formation in Vero cells. The virus was cloned, and the effect of the time of adsorption, pH, temperature, as well as polycations (DEAD-dextran, protamine sulphate) dimethylsuphoxide (DMSO), and trypsin added during adsorption or into the agar overlay on the effectiveness of plaque production by Lassa virus (virus titres, plaque size) were studied. The optimal adsorption time was found to be 1 1/2-2 hours, pH 8.0. The number of plaques produced by the virus was approximately similar at 35 degrees C. The substances under study did not enhance the efficacy of plaque formation, on the contrary, DMSO and high concentrations of polycations decreased plaque size.

Adsorption↗
PubMedDate not supplied

[Mechanism of action of 2-(1'-aminoethyl)-bicyclo[2.2.1]heptane hydrochloride].

The effect of 2-[1'-aminoethyl)-bicyclo[2.2.1]heptane chlorohydrate on the accumulation of hemagglutinating activity of chick embryo fibroblasts infected with influenza A/FPV/Rostock/34 (Hav1N1) and A/WSN/33 (H0N1) was studied. The drug inhibited hemagglutinines accumulation when added at various intervals after infection, the maximum effect having been observed upon its addition to the maintenance medium immediately after adsorption. Polyacrylamide gel electrophoresis showed the drug to reduce the synthesis of virus-specific proteins of A/FPV and to inhibit considerably the transcriptase activity of A/FPV and A/WSN viruses in vitro.

Adsorption↗
PubMedDate not supplied

[Characteristics of the degree and spectrum of antiviral activity of 2-(1'-aminoethyl)-bicyclo[2.2.1]heptane hydrochloride].

A high activity of a bicycloheptane derivative against influenza viruses, poor activity against Venezuelan equine encephalomyelitis and parainfluenza type 3 viruses, and the lack of activity against herpes simplex, vaccinia, ECHO 6, adenovirus type 3 replicating in tissue cultures were demonstrated. The efficacy of the drug in orthomyxovirus infection of tissue culture includes the viruses with the antigenic formula A (H3N2) and A (H1N1), is poor with the A/PR8/34 (H0N1) virus, and lacking with influenza B virus. The characteristics of antiviral activity of the drug obtained in tissue culture, chick embryos, and white mice were not inferior to that of remantadine. Animal experiments demonstrated its lower toxicity as compared with remantadine allowing it to be used in higher doses, thereby exceeding the effect of remantadine.

Animals↗
PubMedDate not supplied

[Possibility of protecting vertebrates against transmissive infection with tick-borne encephalitis virus].

A previously unknown phenomenon of reproduction inhibition and limitation of dissemination of virus agents transmitted by ticks to mammals by the effect of the immunity of vertebrates directed against blood-sucking arthropods was established. Inoculation of the animals with serum immune to uninfected tick saliva antigens led to inhibition of tick-borne encephalitis virus reproduction in them by 1.75--3.0 lg LD50/0.03 ml when the animals had been infected transmissively (by feeding of infected ticks on them). On the animals containing antibody to tick saliva antigens no virus transmission from infected ticks to non-infected vectors occurred upon their simultaneous parasitizing.

Animals↗
PubMedDate not supplied

[The efficacy of an antiviral factor obtained from infected chick embryo fibroblasts in an experimental herpetic infection].

Treatment of mice with an antiviral factor obtained from the culture medium of infected chick embryo fibroblasts protected them against lethal meningoencephalitis caused by herpes simplex virus. The degree of protection varied from 50 to 75% depending on the virus dose, the route of infection, and the mode of the antiviral factor application.

Animals↗
PubMedDate not supplied

[Virus-induced dyslipidemias as possible risk factors in the development of somatic diseases].

Experimental and clinical studies showed a number of virus infections to be accompanied by lipidemic disorders. Experimentally, dyslipidemias were found in tick-borne encephalitis (TBE) in mice, rotavirus infection in rabbits, and amyotrophic leukospongiosis in guinea pigs. The possibility of correcting the virus-induced lipidemic disorders with an antiviral drug, lincomycin, was demonstrated in TBE in mice. Dynamic study of the lipidemic status of patients with virus hepatitis A revealed marked dyslipidemia of the atherogenic type which was stable and persisted up to the time of clinical recovery. The data obtained supplement the current concepts concerning the pathogenesis of virus infections.

Adult↗
PubMedDate not supplied

[The action of reserpine in experimental rabies infection].

Experimental studies in laboratory animals showed reserpine in doses of 0.01-0.05 mg/kg body weight to inhibit the development of rabies infection in white mice and rabbits by 40.0-83.4% depending on the dose and mode of administration. The inhibiting properties of reserpine were demonstrated for both fixed and street rabies virus strains. The protective effect of the drug was manifested after parenteral and oral administration to the infected animals. The experimental data suggest that reserpine may be used as an antiviral drug for protective treatment of rabies in the incubation period.

Administration, Oral↗
PubMedDate not supplied

[New properties of trental as an inhibitor of viral activity with a wide range of activity].

Experimental investigations on the spectrum and degree of the expression of trental antiviral activity were carried out. The investigations were done in cell cultures and laboratory animals using laboratory strains (including drug-resistant ones) of 13 viruses, causative agents of human and animal infections. The drug demonstrated its activity against 8 viruses of 7 families. It was highly active against 5 viruses: herpes simplex virus (including its acyclovir-resistant strain), vaccinia virus (including its methisazone-resistant strain), rotavirus and tick-borne encephalitis virus. As regards other viruses, its activity was less pronounced (hepatitis JA virus) or low (vesicular stomatitis virus, West Nile virus). It was concluded that, being a cardiovascular drug, trental was an effective broad spectrum virus inhibitor.

Animals↗
PubMedDate not supplied

[Features of the antiviral effect of carbocyclic compounds depending on their concentration].

Antiviral agents and new agents possessing antiviral properties and characterized by a carbocyclic (carcass) structure were shown to differ from other, specifically, heterocyclic compounds, by the presence of a range from the maximally effective to maximally tolerable concentrations, the antiviral effect decreasing in this range of concentrations. This feature was observed in cell cultures, chick embryos, and laboratory animals in experiments with different influenza viruses and RS virus.

Animals↗
PubMedDate not supplied

[Suppression of the reproduction of the human immunodeficiency virus (HIV) with a cytokine-like antiviral factor].

Cytokine-like antivirus factor, obtained from the culture fluid of chick embryo fibroblasts, was found to possess inhibitory activity with respect to HIV-1 (strains 1/Zmb and RF). The treatment of HIV-infected cell culture with cytokine-like factor was accompanied by a decrease in the cytopathic effect of the agent without manifestations of cytotoxicity. The combined use of the cytokine-like factor and azidothymidine at near-threshold concentrations was not accompanied by an increase in the antivirus effect, observed after the use of each preparation separately.

Animals↗