Biomedical subjects
Publications and source records attributed to T V Davydova.
Nonspecific immunomodulators (complete Freund's adjuvant and bovine serum albumin) produced an antistress effect on mice during immobilization stress. Immunization with a serotonin-protein conjugate produced no antistress effect.
In this review the authors analyze neuroimmune aspects of the pathogenesis of such neuropsychic diseases as drug addiction, alcoholism, epilepsy, and pathologic pain. The role of pro-inflammatory cytokines in the development of pathological pain and epilepsy is discussed. The authors analyze their own data on the role of antibodies to neuromediators, such as catecholamines, serotonin, and glutamate, in the development of various forms of neuropathology, and outline the prospects of immunotherapy of the mentioned forms of neuroimmunopathology, including immunotherapy with conjugate on homological protein carrier.
Experiments on C57Bl/6 mice under conditions of free choice between alcohol and water for 10 months showed that intranasal administration with antiserotonin antibodies in doses of 30 and 15 microg/kg for 2 week decreased alcohol consumption over 1 month after treatment.
Immobilization stress for 14 h induced lymphopenia, hypoplasia of the thymus and spleen, and decrease in functional activity of T lymphocytes and macrophages in C57Bl/6 mice. Active induction of antibodies against serotonin during stress decreased functional activity of T lymphocytes and partially recovered phagocytic activity of peritoneal macrophages.
Disorders in the main chains of platelet antioxidant protection were examined in 32 patients with primarily-diagnosed ovary cancer who were postoperatively receiving chemotherapy according to PC. The activity of antioxidant-protection enzymes (superoxide dismutase, catalase, glutation-S-transferase) as well as the content of malonic dialdehyde (MDA) and glutathione were examined after each course of chemotherapy. The data obtained were compared with the aggregation ability of platelets, with the content of fibrinogen and with the count of platelets. The parameters of the antioxidant system in platelets were examined for control in 30 virtually healthy women. The results denote that the oxidant stress progression in the body due to the growing tumor and aggravating because of chemodrugs deregulates the free-radical processes in platelets, which can affect their functional properties or rheological blood properties.
Phagocytic activity of peripheral blood neutrophils underwent phase changes in patients with Alzheimer's disease. Neutrophils retained the ability to engulf microbes, but their digestive activity decreased at the early stage of Alzheimer's disease. At the late stage we observed a decrease in the count of phagocytizing neutrophils, reduction of myeloperoxidase activity, and increase in the content of cationic proteins.
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The activities of lipid peroxidation and of platelets' antioxidant protection were investigated in 30 healthy women and in 44 patients with primarily diagnosed different-stage ovary cancer (OC). An essentially higher activity of superoxide dimutase (SOD, by 2.5 times) and of catalase (by 1.5 times) was detected in platelets of OC patients versus the norm. A simultaneous increase of malonic dialdehyde (MDA) by 2.5 times denotes a free-radical activation. There was also an insignificant growth of the glutathione level, whereas the activity of glutathione-S-transferase (GST) did not virtually change. A comparative analysis of the biochemical indices of patients with different stages of the disease revealed valuable distinctions related with a higher activity of SOD and catalase in stages 3-4 versus the initial stages. Notworthility, the MDA level was decreasing. Minor changes in the system of glutathione are not obviously decisive in impairing the regulatory mechanism of antioxidant protection in platelets unlike in malignant cells. The results provide a solid basis for assuming that the impact made by deranged regulations of free radicals on the platelet chain in the hemostasis system causes changes in the blood rheological properties entailing a higher aggregation of platelets, thus, triggering the onset of platelet-embolic complications in the discussed patient category. The impaired regulation mechanism of antioxidant protection in platelets is a major manifestation of the oxidant stress evolving due to a growing tumor; the mechanism is important for evaluating the structural-and-functional platelets' condition.
Plasma concentration of immune complexes and antibodies to serotonin and dopamine were higher in patients with Alzheimer's disease compared to mentally healthy volunteers of the same age. Plasma concentrations of antibodies to serotonin and dopamine decreased with the increase in the duration of this disease.
Glutathione content, the activity of glutathione-dependent enzymes (glutathione reductase, glutathione peroxidase, and glutathione S-transferase), and also SOD (superoxide dismutase) and catalase were studied in human malignant tumors (uterus, breast, and ovaries) and normal tissues. Glutathione level and the activity of glutathione-dependent enzymes were 2-3 times higher in the malignant tumors than in normal tissues. A negative correlation between the level of glutathione and glutathione-dependent enzymes (glutathione peroxidase and glutathione S-transferase) in tumors and the efficacy of postoperative chemotherapy may characterize the degree of tumor resistance to chemotherapy and therefore may have prognostic value. Low SOD and catalase activity and high activity of glutathione-dependent enzymes in tumors suggest that glutathione peroxidase and glutathione S-transferase play a major role in peroxide utilization in malignant tumors.
Experiments on C57Bl/6 mice maintained under conditions of free-choice between ethanol and water for 12 months showed that adoptive transfer of splenocytes extracorporeally stimulated with reaferon suppressed alcohol consumption within 1 month.
Dysregulation of neuroimmune connections is a primary or secondary pathogenic factor of some CNS diseases. Autoimmune aggression is typical of multiple sclerosis, Alzheimer's disease, and epilepsy, while dysregulation characterized by enhanced production of autoantibodies to neurotransmitters and activation of cell factors is characteristic of alcoholism and drug abuse. In experimental models of alcoholism and drug addiction, protective effects of antiserotonin antibodies are mediated by immune cells stimulated by these antibodies. These effects can be used in the therapy of various forms of neuroimmunopathology by the method of adoptive immunotherapy.
Experiments on C57Bl/6 mice kept under conditions of free choice between alcohol and water for 4 and 12 months showed that adoptive transfer of splenocytes extracorporeally stimulated with arginine vasopressin suppressed alcohol intake.
Leukocyte count decreased, relative content of neutrophils and monocytes increased, and their phagocytic activity was suppressed in rats with 1-methyl-4-phenyl-1,2,3,4-tetrahydropyridine-induced depressive syndrome at the stage of acute behavioral depression. The severity of behavioral depression inversely correlated with changes in the absolute neutrophil and monocyte counts.
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