Concentration of anti-inflammatory cytokines in supernatants of peripheral blood cell cultures in children with autoimmune and infectious diseases

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Abstract

Cytokines belong to the class of signaling molecules, being involved into regulation of proliferation, differentiation and effector functions of immunocompetent cells. The ratio of pro- and anti-inflammatory cytokines is important for development of any inflammatory process. IL-1ra, IL-4, IL-10 are among the most important anti-inflammatory cytokines. Their function is to limit and suppress immune response in inflammatory processes of any etiology. In this respect, the aim of this study was to evaluate production of the anti-inflammatory cytokines IL-1ra, IL-4 and IL-10 by peripheral blood cells in children with autoimmune and infectious diseases. Patients and methods: Pediatric parients (2-17 years old) participated in the study including those with juvenile idiopathic arthritis (n = 101); unspecified reactive arthropathy (n = 24); systemic lupus erythematosus (SLE, n = 14); chronic viral hepatitis C (n = 24). 33 healthy children (n = 33) comprised the control group. Heparinized blood samples were diluted with glutamine-containing medium RPMI-1640. Control samples were not treated by any stimulants, and the stimulated samples were supplied with phytohemagglutinin (20 mkg/ml). The samples of diluted blood were incubated for 24 hours (37 °C, 5% CO2). The supernates were frozen once. The concentrations of IL-1ra, IL-4 and IL-10 in these cell supernatants were determined by ELISA technique (Vector-Best, Russia). Results: It was found that the spontaneous production of anti-inflammatory cytokines (IL-1ra, IL-4 and IL-10) didn’t differ, or was lower in the groups of patients with SLE, juvenile idiopathic arthritis and hepatitis C if compared with control group. SLE is an autoimmune disease, whereas juvenile arthritis is of mixed autoimmune-autoinflammatory etiology. Chronic hepatitis C is a viral disease, but autoimmune responses may manifest at the chronic stage of the disorder. Decreased production of anti-inflammatory cytokines could be an evidence for autoimmune mechanisms of these diseases, despite their different etiology. More intensive spontaneous production of IL-1ra and IL-10 in children with unspecified reactive arthropathy may suggest some compensatory reactions which inhibit development of inflammation in this disorder. IL-1ra, IL-4 and IL-10 production in stimulated cultures didn’t differ between all groups of the patients, or it was lower in comparison with healthy children. Decrease cytokine production in groups of children with different diseases suggests exhausted functional reserve of immunocompetent cells caused by their chronic activation.

About the authors

Irina M. Krivolapova

Regional Pediatric Clinical Hospital; Institute of Immunology and Physiology, Ural Branch of Russian Academy of Sciences

Email: krivolapovaim@mis66.ru

PhD (Biology), Biologist, Clinical Diagnostic Laboratory, Junior Research Associate, Laboratory of Immunology of Inflammation

Russian Federation, 620149, Yekaterinburg, S. Deryabina str., 32; Yekaterinburg

Irina A. Pashnina

Regional Pediatric Clinical Hospital

Author for correspondence.
Email: krivolapovaim@mis66.ru

PhD, MD (Biology), Head, Clinical Diagnostic Laboratory

Russian Federation, 620149, Yekaterinburg, S. Deryabina str., 32

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