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This study aimed to determine the role of bacterial lipoprotein (BLP) in autophagy and apoptosis. Western blot was used to examine autophagy biomarkers in mouse bone marrow-derived macrophages (BMDMs) after infection with  Salmonella typhimurium  ( S. typhimurium ) and  Staphylococcus aureus  ( S. aureus ) and BLP stimulation. In BMDMs, enhanced protein expression of LC3-II was observed after  S. typhimurium  or  S. aureus  infection ( P  &lt; 0.05) and BLP stimulation ( P  &lt; 0.05). Autophagy inhibition by chloroquine resulted in increased levels of LC3-Ⅱ and p62 protein ( P  &lt; 0.05). Persistently upregulated expressions of Atg3 and Atg7 were observed following BLP stimulation ( P  &lt; 0.05), and knockdown of Atg3 or Atg7 significantly attenuated BLP-enhanced protein expression of LC3-Ⅱ in BMDMs. Furthermore, we found that the autophagy inhibitor 3-methyladenine prevented BLP- and infection-induced macrophage apoptosis. BLP is not only required for autophagy and apoptosis activation in macrophages but also for regulating the balance between autophagy and apoptosis.

Bacterial lipoprotein plays an important role in the macrophage autophagy and apoptosis induced by Salmonella typhimurium and Staphylococcus aureus