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Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages

Macrophages are phagocytic cells that play a key role in host immune response and clearance of microbial pathogens. Porphyromonas gingivalis is an oral pathogen associated with the development of periodontitis. Escape from macrophage phagocytosis was tested by infecting THP-1-derived human macrophag...

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Autores principales: Werheim, Erik R., Senior, Kevin G., Shaffer, Carly A., Cuadra, Giancarlo A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7563140/
https://www.ncbi.nlm.nih.gov/pubmed/32961960
http://dx.doi.org/10.3390/microorganisms8091432
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author Werheim, Erik R.
Senior, Kevin G.
Shaffer, Carly A.
Cuadra, Giancarlo A.
author_facet Werheim, Erik R.
Senior, Kevin G.
Shaffer, Carly A.
Cuadra, Giancarlo A.
author_sort Werheim, Erik R.
collection PubMed
description Macrophages are phagocytic cells that play a key role in host immune response and clearance of microbial pathogens. Porphyromonas gingivalis is an oral pathogen associated with the development of periodontitis. Escape from macrophage phagocytosis was tested by infecting THP-1-derived human macrophages and RAW 264.7 mouse macrophages with strains of P. gingivalis W83 and 33277 as well as Streptococcus gordonii DL1 and Escherichia coli OP50 at MOI = 100. CFU counts for all intracellular bacteria were determined. Then, infected macrophages were cultured in media without antibiotics to allow for escape and escaping bacteria were quantified by CFU counting. P. gingivalis W83 displayed over 60% of the bacterial escape from the total amount of intracellular CFUs, significantly higher compared to all other bacteria strains. In addition, bacterial escape and re-entry were also tested and P. gingivalis W83, once again, showed the highest numbers of CFUs able to exit and re-enter macrophages. Lastly, the function of the PG0717 gene of P. gingivalis W83 was tested on escape but found not related to this activity. Altogether, our results suggest that P. gingivalis W83 is able to significantly avoid macrophage phagocytosis. We propose this ability is likely linked to the chronic nature of periodontitis.
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spelling pubmed-75631402020-10-27 Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages Werheim, Erik R. Senior, Kevin G. Shaffer, Carly A. Cuadra, Giancarlo A. Microorganisms Article Macrophages are phagocytic cells that play a key role in host immune response and clearance of microbial pathogens. Porphyromonas gingivalis is an oral pathogen associated with the development of periodontitis. Escape from macrophage phagocytosis was tested by infecting THP-1-derived human macrophages and RAW 264.7 mouse macrophages with strains of P. gingivalis W83 and 33277 as well as Streptococcus gordonii DL1 and Escherichia coli OP50 at MOI = 100. CFU counts for all intracellular bacteria were determined. Then, infected macrophages were cultured in media without antibiotics to allow for escape and escaping bacteria were quantified by CFU counting. P. gingivalis W83 displayed over 60% of the bacterial escape from the total amount of intracellular CFUs, significantly higher compared to all other bacteria strains. In addition, bacterial escape and re-entry were also tested and P. gingivalis W83, once again, showed the highest numbers of CFUs able to exit and re-enter macrophages. Lastly, the function of the PG0717 gene of P. gingivalis W83 was tested on escape but found not related to this activity. Altogether, our results suggest that P. gingivalis W83 is able to significantly avoid macrophage phagocytosis. We propose this ability is likely linked to the chronic nature of periodontitis. MDPI 2020-09-18 /pmc/articles/PMC7563140/ /pubmed/32961960 http://dx.doi.org/10.3390/microorganisms8091432 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Werheim, Erik R.
Senior, Kevin G.
Shaffer, Carly A.
Cuadra, Giancarlo A.
Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages
title Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages
title_full Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages
title_fullStr Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages
title_full_unstemmed Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages
title_short Oral Pathogen Porphyromonas gingivalis Can Escape Phagocytosis of Mammalian Macrophages
title_sort oral pathogen porphyromonas gingivalis can escape phagocytosis of mammalian macrophages
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7563140/
https://www.ncbi.nlm.nih.gov/pubmed/32961960
http://dx.doi.org/10.3390/microorganisms8091432
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