Role of the type 6 secretion system on apoptosis and macrophage polarization during Burkholderia pseudomallei infection.

Burkholderia pseudomallei (Bpm) is the causative agent of the disease melioidosis. As a facultative intracellular pathogen, Bpm has a complex lifestyle that culminates in cell-to-cell fusion and multinucleated giant cells (MNGCs) formation. The virulence factor responsible for MNGC formation is the...

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Main Authors: Jacob L Stockton (Author), Nittaya Khakhum (Author), Alfredo G Torres (Author)
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Published: Public Library of Science (PLoS), 2024-10-01T00:00:00Z.
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042 |a dc 
100 1 0 |a Jacob L Stockton  |e author 
700 1 0 |a Nittaya Khakhum  |e author 
700 1 0 |a Alfredo G Torres  |e author 
245 0 0 |a Role of the type 6 secretion system on apoptosis and macrophage polarization during Burkholderia pseudomallei infection. 
260 |b Public Library of Science (PLoS),   |c 2024-10-01T00:00:00Z. 
500 |a 1935-2727 
500 |a 1935-2735 
500 |a 10.1371/journal.pntd.0012585 
520 |a Burkholderia pseudomallei (Bpm) is the causative agent of the disease melioidosis. As a facultative intracellular pathogen, Bpm has a complex lifestyle that culminates in cell-to-cell fusion and multinucleated giant cells (MNGCs) formation. The virulence factor responsible for MNGC formation is the type 6 secretion system (T6SS), a contractile nanomachine. MNGC formation is a cell-to-cell spread strategy that allows the bacteria to avoid the extracellular immune system and our previous data highlighted cell death, apoptosis, and inflammation as pathways significantly impacted by T6SS activity. Thusly, we investigated how the T6SS influences these phenotypes within the macrophage and pulmonary models of infection. Here we report that the T6SS is responsible for exacerbating apoptotic cell death during infection in both macrophages and the lungs of infected mice. We also demonstrate that although the T6SS does not influence differential macrophage polarization, the M2 polarization observed is potentially beneficial for Bpm pathogenesis and replication. Finally, we show that the T6SS contributes to the severity of inflammatory nodule formation in the lungs, which might be potentially connected to the amount of apoptosis that is triggered by the bacteria. 
546 |a EN 
690 |a Arctic medicine. Tropical medicine 
690 |a RC955-962 
690 |a Public aspects of medicine 
690 |a RA1-1270 
655 7 |a article  |2 local 
786 0 |n PLoS Neglected Tropical Diseases, Vol 18, Iss 10, p e0012585 (2024) 
787 0 |n https://doi.org/10.1371/journal.pntd.0012585 
787 0 |n https://doaj.org/toc/1935-2727 
787 0 |n https://doaj.org/toc/1935-2735 
856 4 1 |u https://doaj.org/article/21a60b74db9b44b7947b8a8bcb87dbac  |z Connect to this object online.