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https://observatorio.fm.usp.br/handle/OPI/41630
Title: | CpG-ODN Signaling via Dendritic Cells-Expressing MyD88, but Not IL-10, Inhibits Allergic Sensitization |
Authors: | ALBERCA, Ricardo Wesley; GOMES, Eliane; RUSSO, Momtchilo |
Citation: | VACCINES, v.9, n.7, article ID 743, 13p, 2021 |
Abstract: | Allergen-specific T helper (Th)2 cells orchestrate upon allergen challenge the development of allergic eosinophilic lung inflammation. Sensitization with alum adjuvant, a type 2 adjuvant, has been used extensively in animal models of allergic lung disease. In contrast, type 1 adjuvants like CpG-ODN, a synthetic toll-like receptor 9 agonist, inhibit the development of Th2 immunity. CpG-ODN induce type 1 and suppressive cytokines that influence Th2 cell differentiation. Here, we investigated the immune modulatory effect of CpG-ODN on allergic sensitization to OVA with alum focusing on dendritic cells (DCs) expressing the MyD88 molecule and the suppressive IL-10 cytokine. Using mice with specific cell deletion of MyD88 molecule, we showed that CpG-ODN suppressed allergic sensitization and consequent lung allergic inflammation signaling through the MyD88 pathway on dendritic cells, but not on B-cells. This inhibition was associated with an increased production of IL-10 in the bronchoalveolar lavage fluid. Sensitization to OVA with CpG-ODN of IL-10-deficient, but not wild-type mice, induced a shift towards Th1 pattern of inflammation. Employing bone marrow-derived dendritic cells (BM-DCs) pulsed with OVA for sensitizations with or without CpG-ODN, we showed that IL-10 is dispensable for the inhibition of allergic lung Th2 responses by CpG-ODN. Moreover, the lack of IL-10 on DCs was not sufficient for the CpG-ODN-induced immune-deviation towards a Th1 pattern. Accordingly, we confirmed directly the role of MyD88 pathway on DCs in the inhibition of allergic sensitization. |
Appears in Collections: | Artigos e Materiais de Revistas Científicas - FM/Outros Artigos e Materiais de Revistas Científicas - LIM/56 Artigos e Materiais de Revistas Científicas - ODS/03 |
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art_ALBERCA_CpGODN_Signaling_via_Dendritic_CellsExpressing_MyD88_but_Not_2021.PDF | publishedVersion (English) | 2.44 MB | Adobe PDF | View/Open |
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