The review presents the results of studies on the effect of low temperatures of different durations on the formation of adaptive reactions in humans. The mechanisms of changes in the metabolic and hormonal processes and cellular and humoral immune response are discussed.(International Journal of Biomedicine. 2018;8(2):95-101.)
Introduction: The purpose of this study was to elucidate the mechanisms of the formation of lymphopenia and lymphocytosis in healthy people, who are living and working in the Arctic region. Materials and Methods: A total of 88 practically healthy people living and working in the Arctic region were examined. An analysis of the results was carried out, depending on the concentration of lymphocytes in the peripheral venous blood: group 1-with lymphopenia, the content of lymphocytes below 1.5 × 10 9 cl/L (21 people); group 2-with a normal lymphocyte content from 1.5 to 3.5 × 10 9 cl/L (47 people); and group 3-with lymphocytosis, lymphocytes in the peripheral blood of more than 3.5 × 10 9 cl/L (20 people). Results: It has been established that the main mechanism for the formation of lymphopenia in a person living in the Arctic is the activation of the migration of functionally active lymphocytes in the tissue. The decrease in the number of circulating lymphocytes is a consequence of their redistribution from the circulating pool to the marginal one and an increase in the activity of adhesive molecules, in particular, the selectin ligand. It was revealed that an increase in the content of lymphocytes in the blood occurs upon the activation of the intracellular energy-intensive mechanisms of lymphoproliferation with an increase in the consumption of intracellular ATP and the participation of the nuclear factor of activated T cells 1. It was shown that the restoration of the circulating pool of mature neutrophils is ensured by the principle of reverse regulation in response to neutropenia by stimulating granulocyte-colony stimulating factor granulopoiesis. Conclusions: The main mechanism for the formation of lymphopenia and lymphocytosis in healthy people was established.
The literature review presents the results of modern studies of the relationship between diet and intestinal microbiota in the regulation of metabolic disorders. Metabolic syndrome, which is a symptom complex that combines abdominal obesity, insulin resistance, hyperglycemia, dyslipidemia and arterial hypertension, remains an important problem, being a risk factor for cardiovascular, neurodegenerative, oncological diseases and the development of type 2 diabetes mellitus. Although the pathogenesis of the metabolic syndrome has not yet been fully elucidated, it is known that visceral obesity and its associated complications, such as dyslipidemia and increased levels of pro-inflammatory cytokines, play a central role. The article presents data on the impact of the consumption of certain food products, the inclusion of plant biologically active substances (flavonoids, polyphenols, etc.) in the diet, as well as the use of elimination diets with the exclusion of carbohydrates or fats from the diet, on reducing the risk of cardiovascular accidents, levels of fasting glucose, total cholesterol, LDL, triglycerides, C-reactive protein, leptin, insulin, reduction in body weight and waist circumference, reduction in the level of circulating endotoxins and changes in the activity of immunocompetent cells. Data are presented on the possible influence of the intestinal microbiota in maintaining inflammation and the formation of degenerative changes in the body. The role of changes in the ratio of the levels of pathogenic microflora, bifidobacteria and lactobacilli in the formation of a pathological condition is shown.
HL is characterized by significantly enlarged lymph nodes and the presence of rare Hodgkin and Reed-Sternberg cells. Pathogenesis is not fully understood. The increase in the disease risk can be associated with immunosuppression, HIV, parenchymal organ transplantation, autoimmune disorders, etc. The possibility of differentiating pathogenetic and protective immune responses associated with this disease will help understand the causes of the disease and the treatment prognosis. The study was aimed to determine the features of immune responses in HL depending on the disease duration and the circulating lymphocyte counts. A total of 134 patients with HL were assessed. The cytogram and phagocytosis were assessed in blood smears stained by the Wright-Giemsa procedure. The expression of lymphocyte markers in lymphocytes was determined using the indirect immunoperoxidase technique and flow cytometry. Serum levels of cytokines, immunoglobulins, autoantibodies and circulating immune complexes were assessed by enzyme immunoassay. Comparative analysis of the immune responses depending on peripheral blood leukocyte counts is provided. It has been found that prolonged HL course is associated with the decrease in the functionally active T cell counts, progressive neutropenia and monocytopenia, along with the increased activity of the reaginic reactions and autosensitization. In individuals with lymphocytopenia, mainly small lymphocytes die, the 3-fold decrease in the counts of such lymphocytes is observed; lymphocytopenia is associated with the deficiency of circulating T cells, both mature and immature, the concentrations of which decrease by 2.5–3 times, while B cell counts show no dramatic changes. The disease progression is associated with reduction of the lymphocyte homeostasis control by granulocytes and monocytes, along with progressive neutropenia and monocytopenia.
Transferrin is an essential component of cell growth and metabolic processes that require iron. An increase in the expression of transferrin receptors on lymphocytes ensures their differentiation, maturation and activation of proliferation. It was of interest to study the relationship between the level of transferrin in the peripheral blood and the level of lymphocytes with the receptor to it. Purpose. To determine the nature of changes in hematological and biochemical parameters of peripheral blood based on the concentration of transferrin and the count of lymphocytes expressing the transferrin receptor CD71+. Materials and methods. a survey of 100 people aged 20 to 40 years living in the city of Arkhangelsk was carried out. Leukograms were carried out using a XS-1000i hematology analyzer (Sysmex). Enzyme immunoassay was used to measure cytokine concentrations. CD71 lymphocyte counts were carried out by flow cytometry (Epixs XL). A biochemical analyzer (STAT FAX 3300) was used to measure biochemical blood parameters. Analyses of the number of lymphocytes expressing the transferrin receptor and the concentration of transferrin in the blood serum were performed. The number of CD71+ lymphocytes within the physiological norm (less than 0.3 × 109 cells/L) and those with increased CD71+ levels (more than 0.5 × 109 cells/L) was identified. Within each group, subgroups with a normal and high transferrin content were identified. Results. It was found that an increase in the concentration of transferrin in the blood is associated with a decrease in the circulation of lymphocytes with the CD71+ receptor and a decrease in the coefficient of transferrin saturation with iron. This situation may be associated with an increased risk of secondary immunodeficiency. Against the background of increased concentrations of transferrin and an increase in the circulation of CD71+ lymphocytes, the concentration of lactate increases, which reflects an increase in the processes of tissue hypoxia. Conclusion. High concentrations of transferrin in the peripheral blood against the background of a decrease in the saturation of transferrin with iron and an increase in tissue hypoxia increase the risk of developing chronic inflammatory processes and may be associated with the formation of secondary immunodeficiency.
The purpose of the research was to study effects of various cytokines on proliferation of peripheral blood white cells. There has been carried out an immunological examination of 234 healthy people aged 20 to 50 years, which included a study of immunograms, hemograms, neutrograms, monocytograms and lymphocytograms. In serum with use of ELISA method, there was determined content of tumor markers: carcinoembryonic antigen (CEA) and alpha-fetoprotein (AFP), as well as cytokines: IL-6, IL-4, IL-10, TNF-α and IFN-γ. The same type of inhibitory effect of elevated concentrations of cytokines, the mechanism of which is probably the induction of expression of tyrosine kinases has been shown. It has been shown that cytokines in concentrations that did not exceed the physiological norms and were close to the average content increased proliferation and differentiation of T and B-lymphocytes thus stimulating cell-mediated and antibody-dependent immune responses. High concentrations of proinflammatory cytokines lead to a sharp reduction in the number of peripheral blood cells with markers of both early and late activation of proliferation without further development of cell-mediated and antibody-dependent responses. Increased concentrations of IL-6 and TNF-α in blood serum more than 20 pg / ml reduced content of CEA and AFD, respectively.
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