Abstract:Neutrophils are involved in the initial steps of most responses to pathogens. In the present study, we evaluated the effects of the interaction of apoptotic vs. necrotic human neutrophils on macrophage infection by Leishmania amazonensis. Phagocytosis of apoptotic, but not viable, neutrophils by Leishmania-infected macrophages led to an increase in parasite burden via a mechanism dependent on TGF-beta1 and PGE2. Conversely, infected macrophages' uptake of necrotic neutrophils induced killing of L. amazonensis.…
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