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• W1601343746 abstract "Apoptosis is a well-defined cellular process in which a cell dies, characterized by cell shrinkage and DNA fragmentation. In parasites like Leishmania, the process of apoptosis-like cell death has been described. Moreover upon infection, the apoptotic-like population is essential for disease development, in part by silencing host phagocytes. Nevertheless, the exact mechanism of how apoptosis in unicellular organisms may support infectivity remains unclear. Therefore we investigated the fate of apoptotic-like Leishmania parasites in human host macrophages. Our data showed—in contrast to viable parasites—that apoptotic-like parasites enter an LC3+, autophagy-like compartment. The compartment was found to consist of a single lipid bilayer, typical for LC3-associated phagocytosis (LAP). As LAP can provoke anti-inflammatory responses and autophagy modulates antigen presentation, we analyzed how the presence of apoptotic-like parasites affected the adaptive immune response. Macrophages infected with viable Leishmania induced proliferation of CD4+ T-cells, leading to a reduced intracellular parasite survival. Remarkably, the presence of apoptotic-like parasites in the inoculum significantly reduced T-cell proliferation. Chemical induction of autophagy in human monocyte-derived macrophage (hMDM), infected with viable parasites only, had an even stronger proliferation-reducing effect, indicating that host cell autophagy and not parasite viability limits the T-cell response and enhances parasite survival. Concluding, our data suggest that apoptotic-like Leishmania hijack the host cells´ autophagy machinery to reduce T-cell proliferation. Furthermore, the overall population survival is guaranteed, explaining the benefit of apoptosis-like cell death in a single-celled parasite and defining the host autophagy pathway as a potential therapeutic target in treating Leishmaniasis." @default.
• W1601343746 created "2016-06-24" @default.
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• W1601343746 date "2015-02-01" @default.
• W1601343746 modified "2023-10-01" @default.
• W1601343746 title "Apoptotic-like<i>Leishmania</i>exploit the host´s autophagy machinery to reduce T-cell-mediated parasite elimination" @default.
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• W1601343746 doi "https://doi.org/10.1080/15548627.2014.998904" @default.
• W1601343746 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4502818" @default.
• W1601343746 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25801301" @default.
• W1601343746 hasPublicationYear "2015" @default.
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