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Biomedical subjects

A V Sanin

Publications and source records attributed to A V Sanin.

At least 19 recordsLinked to original sources
PubMed2000

[Suppression of graft versus host reaction by depositing a magnet-controlled adriamycin dosage form in bone marrow allotransplantation in animal experiments].

The main causes of failures during allogenous bone marrow transplantation is the development of graft versus host reactions. The methods of its prevention and treatment are the use of large doses of human toxic cytostatics and immunosuppressants aimed against donor immunocompetent cells. A way of preventing the adverse effects of cytostatics are targeted transport of long-acting cytostatic dosage forms to an organ or target cell through carriers, such as liposomes, microcapsules, microspheres and their conjugates with monoclonal antibodies. For this purpose, the study used gelatin and gum arabic microspheres containing the immunosuppressive cytostatic adriamycin. To enhance the efficiency of cytostatic depositing at the site of transplantation, the procedure of intraosseous transplantation of allogenous bone marrow transplantation with long-acting adriamycin depositing was developed. With this approach, the authors could not only deposit the agent, but could substantially increase the proportion of donor cells kept at the site of grafting as compared to the intravenous and intraosseous infusion of donor cells. The main advantage of the new technique of allogenous bone marrow transplantation in combination with a long-acting cytostatic dosage form is that acute and chronic graft versus host reactions can be inhibited long by using adriamycin in subtherapeutic dosages.

Animals↗
PubMed1996

Phosprenyl: a novel drug with antiviral and immunomodulatory activity.

A novel antiviral drug with immunomodulatory activity (Phosprenyl) is presented. The main active ingredient of the preparation is polyprenyl phosphates. This medicine is highly efficient against a number of viruses, including HIV in vitro, and tick-borne encephalitis and rabies viruses in the experimental models in vivo. In veterinary practice Phosprenyl is now regarded as an effective therapeutic means for treatment of canine distemper, hepatitis, enteritis, etc.

Adjuvants, Immunologic↗
PubMed1988

[Polymyxin B suppresses the stimulating action of pertussis vaccine on hematopoiesis in mice].

The injection of killed whole-cell pertussis vaccine (PV), prepared from formulated Bordetella pertussis strains 5574 and 305, into mice was shown to produce a stimulating effect on hematopoiesis. This effect was manifested by an increase in the number of endogenic colonies developing in the spleen of mice on days 5 and 9 after their irradiation in a sublethal dose, by the sharp stimulation of the proliferative activity of splenic colony-forming units (CFUs) originating in the bone marrow and by the elevated CFUs level in the peripheral blood. The preliminary incubation of whole-cell PV with polymyxin B, cationic polypeptide selectively reacting with the lipid A moiety of lipopolysaccharide (LPS), led to a sharp decrease in the above-mentioned manifestations of hematopoietic effect of the vaccine, while incubation with cetavlon interacting with the polysaccharide moiety of LPS produced practically no effect on the capacity of the vaccine for stimulating hematopoiesis. The stimulating effect of whole-cell PV on hematopoiesis is supposedly due, to a great extent, to the lipid A moiety of LPS.

Animals↗
PubMed1988

[Immunomodulators and hemopoietic system in malignant growth].

The data on the effect of immunomodulators (IM) of the biologic origin on hematopoietic responses are reviewed. Up-to-date classification of immunomodulators is given. The correlation between the proliferative stem cell response induced by certain immunomodulators, accidental thymus involution, suppressor T cell activity enhancement and the development of transient anemia are analyzed from the standpoint of its possible significance. A conclusion is drawn on the necessity to develop systemic criteria which permit evaluating shifts induced by immunomodulators in the hematopoietic system.

Adjuvants, Immunologic↗
PubMed1987

Indirect visualization of hematopoietic colony-forming stem cell (CFUs) as a possible target cell for Mycoplasma arthritidis.

Utilizing specific rabbit antiserum against M. arthritidis together with complement, a portion of the marrow 7-day CFUs population of CBA mice infected with live mycoplasma organisms 1 day previously was shown to be inactivated. These cells might therefore be considered as candidate target cells for M. arthritidis. 11-day CFUs were unaffected by similar treatment.

Animals↗
PubMed1987

I-J+ suppressor cells are probably involved in regulation of spleen colony formation by hematopoietic stem cells (CFUs).

Treatment of murine bone marrow and spleen cell suspensions with anti-I-Jk alloantiserum and complement resulted in an increased number of CFUs (revealed by Till and McCulloch exocolonization technique) compared with controls. The stimulatory effect was observed with 7-8 day CFUs and was negligible or absent with 11-12 day CFUs. Normal thymus cells treated with anti-I-Jk antiserum plus complement would augment the colony-forming potential of normal marrow cells.

Animals↗
PubMed1987

Enhancement of haematopoiesis-directed suppressor activity in mice following Bordetella pertussis vaccine.

A single injection of killed whole-cell pertussis vaccine (strain 5374) into CBA mice (H-2k) was shown to induce a drastic depletion of cells in the thymus accompanied by the enhancement of suppressor T-cell activity. Thymus cells obtained from pertussis vaccine-treated mice were shown to inhibit the endogenous and exogenous colony formation in the spleen by haematopoietic stem cells (CFUs). Treatment of thymus cells with the anti-I-Jk alloantiserum against a specific marker of suppressor T-cells plus complement abolished the inhibitory effect on CFUs proliferation and had a stimulatory action on the capacity of the marrow CFUs to form macroscopic haematopoietic colonies in the spleen as compared to controls. These results suggest probable involvement of I-J-bearing suppressor T-cells in haematopoietic disorders induced by pertussis vaccine.

Animals↗
PubMed1987

[Reaction of the hematopoietic system in mice to the administration of virulent and avirulent strains of Shigella flexneri 2A].

The influence of live bacteria and antigenic preparations of virulent and avirulent stains of Shigella flexneri 2a on the endogenous splenic colony formation in murine hematopoietic cells has been studied. The different stimulating activity of live microbial cells of virulent and avirulent strains Shigella flexneri 2a and their antigenic preparations on the endogenous colony formation has been shown. The effect observed depends on the preparation doses and time of their administration before irradiation of the animals. The stimulating influence on the development of hemopoiesis endogenous foci may be conditioned by the action of heat-labile products of the live microbial cells and closely correlates with the virulence of strains studied.

Animals↗
PubMed1986

[Stimulation of the suppressor activity in relation to hematopoietic cells in the mouse thymus as affected by pertussis vaccine].

After a single intraperitoneal injection of formalinized whole-cell pertussis vaccine 5374 into CBA mice a drastic depletion of cells in the thymus accompanied by the enhancement of suppressor T-cells production is observed. T-cells inhibit the endogenous and exogenous colony-formation in the spleen by hematopoietic stem cells (CFUs). Treatment of thymus cells with the anti-I-Jk alloantiserum against a specific marker of suppressor T-cells in the presence of complement removes the inhibitory effect on CFUs proliferation and has a stimulatory action on the capacity of the marrow CFUs to form macroscopic hematopoietic colonies in the spleen compared with control ones. These results suggest probable involvement of I-J-bearing suppressor T-cells in the hematopoietic disorders induced by pertussis vaccine.

Animals↗
PubMed1986

[Possible role of the T-cells in regulating in situ hematopoiesis].

The aim of the study was to reveal the possible role of T cells in the negative regulation of hematopoiesis. The main experimental approach included incubation of bone marrow cells obtained from mice of different strains with the anti-serum against a specific marker of suppressor T cells--antigen I-J. Anti-I-Jk serum-treated cells and cells treated with nontoxic normal mouse serum or non-treated cells (controls) were further incubated with complement and tested for their CFUs content, using Till & McCulloch exocolonization technique. Treatment with anti-I-Jk serum had a stimulating effect on the CFUs colony formation in mice of the appropriate haplotype (CBA, AKR, A/Sn) bearing I-Jk, but not I-Jb (CC57Br) allele. The same results were obtained in transfer experiments using spleen cells; only in this case stimulating effect was observed in 7-8-day CFUs, while with the marrow transplant augmentation it was seen both 7-8 and 11-12 days following grafting. The seeding efficiency of CFUs was not changed after incubation with anti-I-J serum. The data prove that indigenous for the spleen and bone marrow of mice cells expressing I-J determinants are involved in the negative regulation of hematopoiesis in situ.

Alleles↗
PubMed1986

[Effect of the lymphocytosis-stimulating factor from Bordetella pertussis on murine lymphoid and hemopoietic cells].

Effect of B. pertussis lymphocytosis-promoting factor (LPF) on the lympho-hematopoietic system of mice was studied. The injection of LPF was shown to sharply enhance endogenous colony formation and to induce a severe depletion of thymus cells, reaching its maximum of day 4. Thymocytes obtained on day 2 or 3 after the injection of LPF produced a suppressive effect on endogenous colony formation. The proliferative activity of hematopoietic stem cells sharply increased under the influence of LPF, though it had no radioprotective action. On the following day after the injection of LPF a steep rise in the number of hematopoietic stem cells was observed in the blood of mice: their content increased 20-fold in comparison with the control level. These data may be important for the evaluation of the side effects of pertussis vaccine on the lympho-hematopoietic system.

Animals↗
PubMed1986

[Proliferation and splenic migration of mouse hematopoietic stem cells following a single injection of Mycoplasma arthritidis].

The effect of a single injection of live M. arthritidis microorganisms on the bone marrow and spleen CFU-S populations was assessed. One of the principal findings is that marrow CFU-S are recruited into cell cycle (as determined by hydroxyurea kill) early after M. arthritidis administration and stay in the cycle for at least 2 weeks thereafter. The peak level of cycling value (47%) was observed on day 4. The duration of increased CFU-S cycling activity was shown to coincide with a time period during which a significant rise in the number of endogenous CFU-S was maintained. The other important finding is that splenic seeding efficiency ("f-factor") declines by 56% one day following M. arthritidis administration. The latter effect could be attributed to the binding of mycoplasmas to the surface of CFU-S as specific rabbit antiserum against M. arthritidis incubated in vitro with the bone marrow cells of infected donor mice caused an up to 48% reduction in the in vivo colony-forming ability of CFU-S.

Animals↗
PubMed1986

[Immune complex binding by erythrocytes and its significance in the destruction of these cells during immunization].

Immunization of BALB/c mice by sheep red blood cells and Salmonella typhi vaccine has been shown to augment the immune complexes in plasma and erythrocytes in blood fixing the immune complexes on their surface. The inactivation of immune complexes in immunized mice by intravenous injection of the antiserum against aggregated immunoglobulins decreases the hemoglobin in blood serum. The data obtained show that the fixation of immune complexes on erythrocytes is one of the reasons of erythrocytes destruction activation in immunization.

Animals↗