Reaction of eosinophilic granulocytes of guinea pigs airways to the experimental allergic inflammation according to the morphometric study

Abstract

Background. After creating an animal model of experimental airways allergic inflammation using ovalbumin, scientists mainly studied the reaction of the cellular and humoral links of the acquired specific immunity. At the same time, it is known that the development of allergic inflammation of the airways to the effect of the environmental chemoattractants is primarily the result of the local innate immune system response. Pulmonary neuroendocrine cells of the airway epithelium with the help of neuropeptides activate the secretion of IL-5 and IL-13 by type 2 innate lymphoid cells IL-5 determines the eosinophilic inflammation. The question of the reaction of the components of innate immunity of the respiratory tract to the allergic inflammation in most aspects remains open. open. Objective. The purpose of the current study was to define the reaction of eosinophilic granulocytes in guinea pigs lungs as an important component of the innate immunity of the respiratory tract to experimental ovalbumin-induced allergic inflammation according to the data of a morphometric study. Methods. Histological, morphometric, statistical methods were used to study the topographic features and the number of eosinophils in the lungs of male 48 guinea pigs on the 23rd, 30th, 36th and 44th days after initiation of the experimental ovalbumin-induced allergic airway inflammation. Results. Our study demonstrates a significant reaction occurs on the part of the cellular link of innate immunity, which consists in the activation of eosinophils, in the experimental model of ovalbumin-induced airways allergic inflammation. The most significant changes were observed in the distal parts of the intrapulmonary airways and in the structures of the pulmonary acinus in the early period of the development of the inflammatory process (23rd and 30th days after the start of the experiment). The late (36th and 44th days after the start of the experiment) period of the development of an allergic inflammatory process in the lungs is accompanied by a gradual decrease in the activity of eosinophilic inflammation. At the same time, the quantitative indicators remain statistically significantly higher in the intact and control groups, which indicates the continuation of allergic inflammation in the absence of the action of the allergen and is a manifestation of the violation of the recovery and adaptation processes in the local immune system of the lung. Conclusion. After ovalbumin-sensitization and aeroallergization eosinophilic inflammation develops in the lungs of a guinea pig, as a result of the reaction of the innate immunity to the action of an allergen. Actively and first of all, allergic eosinophilic inflammation develops in the distal airways (terminal bronchioles) and in the connective tissue stroma of the pulmonary acinus.