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Eosinophils are an endogenous source of IL-4 during filarial infections and contribute to the development of an optimal T helper 2 response.
Journal of Innate Immunity 2024 Februrary 15
Interleukin-4 (IL-4) is a central regulator of type 2 immunity, crucial for the defense against multicellular parasites like helminths. This study focuses on its roles and cellular sources during Litomosoides sigmodontis infection, a model for human filarial infections. Our research uncovers eosinophils as a major source of IL-4, especially during the early phase of filarial infection. Using dblGATA mice lacking eosinophil and subsequently eosinophil-derived IL-4, we reveal their profound impact on the Th2 response. Lack of eosinophils impact Th2 polarization and resulted in impaired type 2 cytokine production. Surprisingly, eosinophil deficiency had no impact on macrophage polarization and proliferation as well as on antibody production. These findings shed new light on IL-4 dynamics and eosinophil effector functions in filarial infections.
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