Relationship between levels of brain natriuretic peptide in blood and immune response in subjects

Abstract

Elevated concentrations of Nt-pro-BNP were revealed in 11% of apparently healthy subjects aged 19–24 years and 22% of middle-aged (34–55 years) subjects. An increase in Nt-pro-BNP blood concentration was detected in 90% of patients with metabolic syndrome. Elevated levels of Nt-pro-BNP in peripheral blood occur with age. Higher concentrations of the peptide were revealed in women. Inhibition of lymphocytes proliferation and differentiation accompanied by increasing concentration of Nt-pro-BNP in blood is associated with a deficiency of the IL-2 level due to increased IL-10 concentration. Immunosuppressive effect of IL-10 declares itself at the level of innate immune reactions as a decrease in blood counts of naive CD45RA+ T lymphocytes, natural killer cells, T cells with adhesion receptor (CD56+) and adhesion receptor ligand (CD62L+). To prevent a loss of the intercellular pool, the effect of Nt-pro-BNP is activated. No statistically significant correlations between the increased Nt-pro-BNP concentration in blood and the content of serum IgM, IgG, IgA, IgE, IL-6, TNF-α, IFN-γ, CEC C1q, or С3d, as well as glucose, hemoglobin, transferrin, iron, or free fatty acids were revealed in apparently healthy subjects.