Distribution characteristics of RIG-I receptors of innate immunity in experimental diabetes mellitus and administration of nonspecific blockers of TNFα.

Abstract

Background: We study type 1 diabetes as examples in which interactions between host and viruses have been implicated in autoimmune pathology. The RIG-I-like receptors (RLRs) as a sensors of RNA virus infection which can initiate and modulate antiviral immunity have been studied. The aim of the study was to determine the features of expression of retinoic acid-inducible gene-I (RIG-I) receptors in GALT in experimental diabetes mellitus (EDM) and after administration of pentoxifylline.Materials and Methods: To determine structure of population of RIG +-cells we used the analysis of serial histological sections using the method of indirect immunofluorescense with monoclonal antibodies to RIG-I of rat (Santa Cruz Biotechnology, USA).Results: It has been established that diabetes development was accompanied by an increase in total density RIG+ cells, population density of RIG+ macrophages and increase the concentration of the RIG protein in these cells in the lymphoid structures of ileum at 2nd week. But this data showed a dynamics to decrease to control values by the 4th week of disease. Pentoxifylline (PTX) administration of diabetic animals resulted in a decrease of the total density RIG+ cells, population density RIG+ dendritic cells and RIG+ lymphocytes on the at 2nd week of pathology, and on the 4th week of the disease this data showed dynamics to an increase.Conclusions: All of these show that expression of RIG-I in ileum immunopositive cells can influence the differentiation of immunopositive cells and their ability to produce pro-inflammatory cytokines, thus acting as one of triggers of diabetes development and progression.