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- W2085689489 abstract "Macrophages rapidly engulf and remove apoptotic cells to limit the release of noxious cellular contents and to restrict autoimmune disease or inflammation. Recent developments reveal an important role in autophagy for clearance of apoptotic corpses. However, the relationship between autophagy and phagocytosis remains unclear. In this study we found that low doses of oridonin, an active diterpenoid, enhanced phagocytosis of apoptotic cells by human macrophage-like U937 cells, meanwhile it also induced autophagy in these U937 cells. Moreover, inhibition of extracellular signal-related kinase (ERK), nuclear factor-κB (NF-κB) and caspase-1 significantly suppressed oridonin-induced phagocytosis and autophagy. In addition, oridonin increased the protein levels of p-ERK, NF-κB, caspase-1 and pro IL-1β. Autophagic inhibitor 3-methyladenine (3-MA) decreased phagocytosis and the expression of ERK whereas increased the expression of NF-κB- and caspase-1-mediated IL-1β release. Beclin-1 (known as autophagic regulator) loss also led to the similar results. Pretreatment with autophagic agonist rapamycin caused opposite results. Autophagy-associated proteins, Beclin-1, LC3 and Atg4B, involved in this phagocytosis process. These results demonstrated that autophagy enhanced oridonin-induced phagocytosis through feedback regulation of ERK, NF-κB- and caspase-1-mediated IL-1β release." @default.
- W2085689489 created "2016-06-24" @default.
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- W2085689489 date "2012-02-01" @default.
- W2085689489 modified "2023-09-23" @default.
- W2085689489 title "Autophagy enhanced phagocytosis of apoptotic cells by oridonin-treated human histocytic lymphoma U937 cells" @default.
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- W2085689489 doi "https://doi.org/10.1016/j.abb.2011.11.019" @default.
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