1887

Abstract

PPE37 is a member of the proline-proline-glutamic acid (PPE) multigene family. Its expression is upregulated in bacteria that are phagocytosed by macrophages and is enhanced even more in bacteria isolated from the lungs of infected mice. This raises the possibility that PPE37 may play a role in the virulence of and led to this investigation of the function of PPE37. Recombinant bacterial strains, one expressing the PPE37 protein (Ms_ppe37) and another harbouring the vector alone (Ms_vec) were generated from the non-pathogenic . These bacterial strains were used to infect peritoneal exudate and bone marrow-derived macrophages. It was found that, despite the comparable intracellular survival between the two recombinant strains, Ms_ppe37 induced a significantly lower level of tumour necrosis factor alpha and interleukin 6 in the infected macrophages compared with Ms_vec. Western blot analyses revealed that the activation levels of nuclear factor kappa B, mitogen-activated protein kinase (MAPK)/extracellular signal-regulated kinase and MAPK/p38 were lower in macrophages infected with Ms_ppe37 than in macrophages infected with Ms_vec. These results suggest that PPE37 may have a potential role in interfering with the pro-inflammatory cytokine response of infected macrophages.

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2011-05-01
2019-10-21
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