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Biomedical subjects

M B Shtark

Publications and source records attributed to M B Shtark.

At least 19 recordsLinked to original sources
PubMed2006

Neurotrophic effects of polyhydroxylated steroids and steroid glycosides in cultured neuroblastoma cells.

The effects of steroid compounds from Pacific Ocean starfishes were studied using cultured neuroblastoma C-1300 cells. Vital observations and examination of silver-impregnated preparations showed that the test substances in a concentration of 2-10 microM stimulate differentiation and improves survival of neuroblastoma cells under adverse conditions (similarly to neurotrophins). These substances in high concentrations (20-40 microM) had no effect or exhibited cytotoxic activity. The screening test allowed us to select several compounds for further studies of neurotrophic and neuroprotective properties.

Animals↗
PubMed2006

Improvement of Memory by Means of Ultra-Low Doses of Antibodies to S-100B Antigen.

Antigen S-100B of nervous tissue, according to the data of numerous studies, affects the mechanisms of nervous system plasticity and memory. The influence of ultralow doses of antibodies to S-100B (6C dilution, according to the homeopathic pharmacopoeia) has been studied on three learning behavioral models on Wistar rats, which were inhibitory avoidance, choosing of bowls with sucrose and feeding behavior cessation after auditory signal. For all three tasks, parameters of reproduction of the learned skills improved after per oral administration of potentiated antibodies to S-100B antigen immediately after learning. Possible mechanisms of the anti-S-100B antibodies influence on memory formation are discussed.

Journal Article↗
PubMed2004

Plasticity of neuronal responses induced by low concentrations of exogenous ligands affecting cellular calcium stores.

Modification of reactions caused by repeated influences (plasticity) is a fundamental property of cell. In this study, we have revealed effects of low concentrations of two exogenous modulators of cellular processes (caffeine and cyclosporin A) on neuronal plastic properties. The study was carried out on isolated neurons of Lymnaea stagnalis. It was found that low concentrations of caffeine or cyclosporin A did not cause any changes of the membrane potential (MP) of isolated neurons. However, pretreatment of neurons with low concentrations of caffeine or cyclosporin A reduced the amplitude of MP changes caused by the action of physiological concentrations of these ligands on the average by 30.8% and 29.1%, respectively. The findings permitted implying a significant role of low ligand concentrations in the formation of cell memory and neuronal plastic properties.

Animals↗
PubMed2003

Membrane and synaptic effects of anti-S-100 are prevented by the same antibodies in low concentrations.

Effects of antiserum to S-100 protein (AS-100) in high (HC, corresponding to antiserum dilution 1:5 - 1:50) and low (LC, 1:10(12)) concentrations were studied in identified snail neurons and rat hippocampal slices. HC-AS-100 changed the frequency of action potential generation in spontaneously active neurons and blocked formation of long-term potentiation in mossy fiber synapses. LC-AS-100 alone did not affect any characteristic measured in our experiments, but 20 min pre-incubation of snail ganglia or hippocampal slices with LC-AS-100 abolished the effects of the same antibodies in HC. Simultaneous addition of both LC and HC did not prevent the development of HC-AS-100 effects. It seems possible that LC-AS-100 is capable of interaction with neuronal cells modifying their reaction to HC-AS-100.

Animals↗
PubMed2003

Effect of antibodies to morphine in ultralow doses on induction of long-term potentiation in hippocampal slices from rats with chronic morphine dependence.

Antibodies to morphine produced after its chronic administration can contribute to changes in the central nervous system during opiate abuse. Facilitation of long-term posttetanic potentiation in mossy fibers of the hippocampus in rats with chronic morphine dependence can be reproduced in hippocampal slices from normal animals treated with antibodies to morphine. Incubation of hippocampal slices with ultralow doses of antibodies to morphine had no effect on control rats, but reduced facilitation of long-term potentiation in hippocampal slices from animals with chronic morphine dependence. This confirms the possibility of using ultralow doses of antibodies to morphine for therapeutic correction of mechanisms underlying the formation of drug abuse.

Animals↗
PubMed2003

In vitro effects of bipathic treatment with antibodies in ultralow doses during long-term post-tetanic potentiation.

We studied the effects of individual or combination treatment with monoclonal antibodies 5F5-B6 in ultralow doses specifically marking mossy fibers in rat hippocampus and antibodies to S100 protein during long-term post-tetanic potentiation in hippocampal slices. The possible mechanisms of changes produced by therapeutic administration of antibodies in ultralow doses were revealed.

Animals↗
PubMed2003

Reaction of neurons to alkaloid agonists of opioid receptors during modulation of phosphodiesterases.

We studied the effect of ultralow doses of theophylline and morphine, modulators of receptors and intracellular signal systems, on ion permeability of membranes. Theophylline and morphine in ultralow doses blocked the neuronal responses to these agents applied in physiological concentrations. Theophylline in ultralow doses attenuated, but did not completely block neuronal reaction to morphine. These findings suggest that ultralow doses of various substances producing no appreciable physiological changes can activate mechanisms providing optimum response to strong factors.

Alkaloids↗
PubMed2003

Membranotropic effects of antibodies to S100 protein in ultralow doses.

Two types of neurons exhibiting various reactions to application of antibodies against S100 protein in the washing solution were revealed in the nervous system of Helix lucorum snails. After treatment with antibodies against S100 protein the frequency of action potential generation decreased in spontaneously active B1, B3, B17, and PPa6 cells, but increased in B4 and B6 cells. The effect of antibodies against S100 was less pronounced in the solution of potentiated antibodies against this protein. After pre-exposure of ganglia in the solution of potentiated water the effect of antibodies against S100 protein decreased to a lesser extent. No significant changes were revealed in the membrane resting potential of cells. Combination treatment with antibodies and potentiated antibodies against S100 protein increased the threshold of action potential generation in B1 and B17 cells. Our results indicate that potentiated antibodies against S100 protein specifically modulate the activity of nerve cells.

Action Potentials↗
PubMed2003

Hypotensive activity of ultralow doses of antibodies to factors involved in the regulation of vascular tone.

Hypotensive activity of ultralow doses of antibodies to some endogenous substances involved in the regulation of vascular tone was studied on NISAG rats with hereditary stress-induced arterial hypertension. It was found that antibodies to angiotensin II and its receptor in ultralow doses markedly reduced systolic blood pressure, which was reproducible after repeated treatment. The course of peroral treatment with antibodies to endothelin and endothelial NO synthase in ultralow doses did not decrease systolic blood pressure.

Angiotensin II↗
PubMed2003

Hypotensive effect of potentiated antibodies to angiotensin II and AT1 receptors.

Hypotensive activity of ultralow doses of antibodies to angiotensin II and its receptors was studied on adult NISAG rats with hereditary stress-induced arterial hypertension. Antibodies to C-terminal fragment of angiotensin II receptors produced the most pronounced hypotensive effect, which was reproducible after repeated administration. These antibodies decreased systolic blood pressure by 16.40 +/- 0.62 mm Hg. The most rapid hypotensive effect was produced by affinity purified antibodies to angiotensin II: 2 h after administration of these antibodies systolic blood pressure decreased by 12.80 +/- 5.49 mm Hg. Our results indicate that combination treatment with ultralow doses of antibodies to angiotensin II and its receptors hold much promise for the use in clinical practice.

Angiotensin II↗
PubMed2003

Efficiency of ultralow doses of antibodies to S100 protein and delta sleep-inducing peptide in rats with anxious depression.

We studied the effects of single peroral treatment with antibodies against S100 protein and delta sleep-inducing peptide in ultralow doses on behavioral characteristics of rats with anxious depression produced by acute stress (unavoidable electrical shock). Stress-produced behavioral changes and anxiolytic activity of antibodies were determined using the elevated plus-maze, open field, and tail suspension tests. High efficiency of the mixture of antibodies against S100 protein and delta sleep-inducing peptide was observed in all tests. Anxiolytic activity of anti-S100 antibodies (although less pronounced than that of the mixture of antibodies) was revealed in the elevated plus-maze and tail suspension test.

Animals↗
PubMed1993

[The effect of the blood serum from patients subjected to intravenous laser therapy on the parameters of synaptic transmission].

The effect of serum of patients with myocardial ischemia after low-level laser therapy on parameters of synaptic conductance of rat hippocampal neurons was investigated. The serum from patients with an initially low level of neuronal activity obtained after determination of laser irradiation increased the amplitude and that from patients with high activity. Thus the process of normalization of these parameters was observed. Our results may help to optimize the course of medical treatment, and subsequently give an insight to understanding of the mechanism of therapeutic effect of laser irradiation.

Action Potentials↗
PubMed1993

[Changes in the neural activity of the blood serum from patients with ischemic heart disease].

The isolated neurons of snail (Lymnaea stagnalis) were as test object for the evaluation of the blood serum neuroactivity. The blood serum was tested before treatment and after six applications of intravenous laser therapy (ILT). All blood serum specimens produced depolarization of the cell membrane potential. The quantitative comparison of membrane toxicity of control and experimental blood serum specimens permitted to divide the patients into three groups. Blood serum (after six applications of ILT of patients from the first and second groups produced a lower membrane toxicity effect on neurons. In the groups the membrane toxicity effect decrease by 43% +/- 10.3 and 7.3 +/- 2.2% respectively. In third group the membrane toxicity effect increased by 21.5 +/- 4.5. All patients from the third group had myocardial infarction less than one year before being given a course on the treatment. The ILT was found to be able to decrease the activity of the blood serum components disrupting normal functioning of the ionic mechanisms of cell membranes.

Animals↗