Search

We studied the level of immunocompetent blood cells, phagocytic activity of neutrophils, concentrations of cytokines, circulating immune complexes and levels of cyclic nucleotides (cAMP and cGMP) in blood serum with different levels of soluble adhesion molecules NCAM (CD56) and immunoglobulin Fc-receptor III (CD16) in nearly healthy people living in the Arctic territory. An increase in serum concentrations of sCD56 and sCD16 in nearly healthy adults of working age was found to be associated with an increase in the level of cells bearing the corresponding membrane receptors. An increase in sCD56 concentrations was accompanied by an increase in the level of NK (CD3-CD16+CD56+) and T-NK cells (CD3+CD16+CD56+), whereas an increase in sCD16 level, by a decrease in the counts of lymphocytes circulating in blood, mainly, T-helper cells (CD3+CD4+), cytotoxic T-lymphocytes (CD3+CD8+), and activated T-lymphocytes (CD3+HLADR+). Elevated sCD56 concentrations were associated with the increased levels of pro-inflammatory IL-1β, IL-6, TNF-α, and anti-inflammatory IL-10 cells. Concentrations of circulating immune complexes rose with increasing sCD16 and sCD56 levels. The signal conduction activity grew with increasing concentrations of CD16+ and CD56+ leukocytes of peripheral blood and sCD56+ leukocytes, and the shedding of these molecules occurred against the background of cAMP and cGMP decreasing concentrations. [ABSTRACT FROM AUTHOR]

Changes in the immune status and the content of blood transport components reflect adaptations in the human body in response to adverse factors, showcasing the organism's adaptive capabilities and functional state. In this study, we aimed to determine the features of the immune system and levels of transport components of the blood system in residents of the Arctic of the Russian Federation. Methods: The peripheral venous blood of 191 residents of the Arctic of the Russian Federation (Murmansk Oblast) aged 21–55 analyzed comprehensively. Blood was sampled from the ulnar vein on an empty stomach in the morning. The hemogram, phagocytic activity of neutrophils, lymphocyte content with CD3, CD4, CD8, CD10, CD19, CD16, CD71, CD25, HLA‐DR and CD95 phenotypes, concentrations of cytokines: TNF‐α, IFN‐γ, IL‐6, IL‐10, extracellular receptor pool: sCD71, sCD62L, sApo‐1/Fas, sFasL, circulating immune complexes (CIC) and blood transport components: haptoglobin (Hp), transferrin, IgM, IgG, IgA, IgE (immunoglobulins M, G, A and E) low‐density lipoproteins (LDL), and high density lipoprotein (HDL) were evaluated. The results were analyzed using descriptive statistics and comparative, factorial, and regression analyses. Results: Residents of the Murmansk Oblast exhibit a high prevalence of erythrocytosis (62.3%), thrombocytosis (25.0%), leukocytosis (20.1%), and increased hemoglobin (Hb) concentrations (42.5%), coupled with a significantly decreased level of active phagocytes (47.6%). A significantly decreased level of lymphocytes with phenotypes CD3 (92.4%), CD4 (40.4%), CD71 (62.3%) was revealed, coupled with the activation of lymphocytes with phenotypes CD16 (50.1%), CD8 (37.5%), CD19 (15.9%) and increased concentrations of pro‐inflammatory IFN‐γ (47.9%), IL‐6 (33.3%), and TNF‐α (20.1%). Elevated levels of sCD71 (56.6%), sCD62L (32.1%), sApo‐1/Fas (22.1%), sFasL (10.2%), and autoantibodies to double‐stranded DNA (57.1%), RNA (10.4%), and oLDL (oxidized‐modified LDL) (16.3%) were recorded in residents of the Murmansk Oblast. Arctic residents showed elevated concentrations of Hp (63.3%), IgM (63.9%), IgA (42.4%), IgE (18.8%), LDL (24.9%), and a decreased level of HDL (21.1%) owing to an ApoA‐I ligand deficiency (58.1%). Elevated levels of Hp in the blood are associated with increased erythrocyte aggregation frequency, T‐lymphocyte activation, and increased concentration of free receptors of the extracellular pool. Increased IgM and IgA levels in the blood are attributed to the need to bind components of the extracellular receptor pool sCD71, sCD62L, sApo‐1/Fas, sFasL and are associated with decreased levels lymphocyte with CD8 and CD16 phenotypes. The humoral immune response in Arctic residents is triggered when the cellular component of immunity is under strain which compounded by ineffective clearance of metabolic byproducts owing to imbalanced LDL and HDL lipid transport complexes. Conclusions: The immune system of Arctic residents is characterized by excessive cytotoxic activity of lymphocytes and increased concentrations of pro‐inflammatory cytokines, free forms of receptors of the extracellular pool, and autoantibodies. The change in the content of transport components of the blood system is directed at maintaining homeostasis by exhibiting antioxidant, anti‐inflammatory, and immunoregulatory properties. [ABSTRACT FROM AUTHOR]

Objective: The level of immunological reactivity of the indigenous inhabitants of the Far North may depend on the extreme‐discomfort factors of the climatic environment and genetic traits of the population. Therefore, the aim of this study was to identify the distinctive elements of the immune status of the Kola Saami and Russians living in the Far North (Murmansk Region). Methods: A complex immunological study of peripheral venous blood composition was performed and involved 67 Saami and 81 Russian inhabitants of the Far North (Murmansk Region) who were aged 21–55. Blood was collected from the cubital vein on an empty stomach in the morning. For the peripheral venous blood, we obtained a hemogram and phagocytic activity of neutrophils, determined the content of lymphocytes with CD4, CD8, CD16, and CD71 phenotypes by indirect immunoperoxidase reaction and flow cytometry using an Epics XL apparatus (Beckman Coulter, United States), obtained concentrations of IL‐6, IFN‐γ, IL‐10, IgA, M, G, E, sCD54, and sCD62L, transferrin, and sCD71 by enzyme immunoassay using the "Evolis" enzyme immunoassay analyzer from Bio‐RAD (Germany), and obtained circulating immune complexes by precipitation using 3.5%, 4.0%, and 7.5% PEG‐6000. The sIgA content was determined in morning saliva, urine, and gastrointestinal tract secretions. The results were analyzed using descriptive statistics, independent sample t‐criterion, and Pearson correlation coefficient. Results: A decrease in the total number of leukocyte cells in the Saami was associated with a high incidence of leukopenia, lymphopenia, and neutropenia. Deficiency in active phagocytes and serum IgA and sIgA concentrations was revealed as well as increased contents of CD4+ and CD8+ receptor lymphocytes, membrane and free adhesion molecules, and transferrin. Leukocytosis, lymphocytosis, neutrophilia, monocytosis, and eosinophilia with increased contents of natural killer cells, IL‐6, and IL‐10 were recorded more frequently in the Russians. High levels of IgE and IFN‐γ, which have the most pronounced cytotoxicity and are indicative of strained immune mechanisms, were characteristic of the Saami and Russians. Conclusion: The distinctive aspects of the immune status of the Kola Saami is related to the deficit in the active phagocyte and serum IgA and sIgA concentrations as well as the increase in the contents of cytotoxic lymphocytes, intercellular adhesion molecules, transferrin, and IFN‐γ proinflammatory cytokines. The Russian inhabitants of the Far North are characterized by an adaptive response manifested by an increase in antibody‐dependent cytotoxicity, involving IL‐6 and IL‐10. [ABSTRACT FROM AUTHOR]

Data on the level of serum immunoglobulins in residents of the North and Arctic of the European territory of the Russian Federation are presented. In people living in the Arctic, the average concentration of IgM, IgA, and IgE is 1.4–2.6 times higher and the frequency of elevated concentrations is 2.4–8.8 times higher. A high frequency of IgG deficiency of 72.3% was established, which indicates inhibition of switching of antibody synthesis with a predominant predominance of IgM and IgA. In an unfavorable climate, the spectrum of antigenic structures increases and expands significantly. Activation of antibody production is due to an increased level of antigenic effects on the body and an increase in the content and diversity in the intravascular environment of tissue metabolism products with the properties of autoantigens. It was revealed that the concentration of immunoglobulins is significant in the formation of circulating immune complexes (CICs). In residents of the Arctic of the European territory of the Russian Federation, increased concentrations of IgM and IgA are associated with an increase in the content of neutrophil granulocytes and interferon-gamma cytokine (IFN-γ), which in turn is aimed at ensuring the effectiveness of the clearance of waste products in hypoxia. [ABSTRACT FROM AUTHOR]