Efeito imunomodulador de diferentes extratos de Angiostrongylus cantonensis no desenvolvimento de resposta pulmonar alérgica em um modelo murino

Abstract

Asthma is a chronic inflammatory disease of the airways, associated with genetic and environmental factors. Exposure to helminths appears to exert a protective effect on some chronic diseases, such as asthma. The objective of this study was to evaluate the immunomodulatory effect of different extracts of Angiostrongylus cantonensis (A. cantonensis) on the development of allergic pulmonary response by ovalbumin (OVA) in mice. The animals were divided into 6 groups: negative control (PBS), positive control (OVA), animals with asthma immunized with total soluble extract of A. cantonensis (Ac/OVA), animals with proteins from the digestive tract (AcD/OVA), animals with proteins from the reproductive tract (AcR /OVA), and animals with proteins from the cuticle (AcC / OVA). At the end of the OVA protocol, the animals were euthanized for blood collection, bronchoalveolar lavage and lung tissue. OVA-specific IgE was analyzed in blood, and cell counts, IL-4, IL-5, IL-10, INF- ɣ and eotaxin in bronchoalveolar lavage. Histological analysis of the lung was also performed. A significant reduction in the total cell count was observed in the groups that were immunized with the total soluble extract (TE) and with the soluble extract of the systems (SE) of A. cantonensis, compared to the OVA group (p <0.001). We found a significant reduction of eosinophils, macrophages and lymphocytes in the group immunized with TE, as in the SE groups, in relation to the OVA group. However, intraperitoneal immunization with TE and SE did not alter the levels of OVA-specific IgE and cytokines, except for an increase in IL-10 and IFN-γ (p <0.01) in the group immunized with TE. In conclusion, the different worm extracts from A. cantonensis, especially TE, when administered early intraperitoneally, result in a modulation of the OVA-induced allergic lung response in mice, with a distinct response of IL-10 and e INF-ɣ in the TE group.