Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.

In mammalian host cells staphylococcal peptidoglycan (PGN) is recognized by Nod2. Whether PGN is also recognized by TLR2 is disputed. Here we carried out PGN co-localization and stimulation studies with TLR2 and Nod2 in wild type and mutant host cells. To exclude contamination with lipoproteins, pol...

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Autores principales:	Maria Anna Müller-Anstett, Patrick Müller, Till Albrecht, Mulugeta Nega, Jeanette Wagener, Qiang Gao, Susanne Kaesler, Martin Schaller, Tilo Biedermann, Friedrich Götz
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e5b9da3504ee4234bf2ba68848690099
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spelling	oai:doaj.org-article:e5b9da3504ee4234bf2ba688486900992021-11-18T07:03:36ZStaphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.1932-620310.1371/journal.pone.0013153https://doaj.org/article/e5b9da3504ee4234bf2ba688486900992010-10-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20949035/?tool=EBIhttps://doaj.org/toc/1932-6203In mammalian host cells staphylococcal peptidoglycan (PGN) is recognized by Nod2. Whether PGN is also recognized by TLR2 is disputed. Here we carried out PGN co-localization and stimulation studies with TLR2 and Nod2 in wild type and mutant host cells. To exclude contamination with lipoproteins, polymeric staphylococcal PGN (PGN(pol)) was isolated from Staphylococcus aureus Δlgt (lacking lipidated prelipoproteins). PGN(pol) was biotinylated (PGN-Bio) for fluorescence monitoring with specific antibodies. Keratinocytes from murine oral epithelium (MK) readily internalized PGN-Bio in an endocytosis-like process. In wt MK, PGN(pol) induced intracellular accumulation of Nod2 and TLR2 and co-localized with Nod2 and TLR2, but not with TLR4. In TLR2-deficient MK Nod2 and in Nod2-deficient MK TLR2 was induced, indicating that PGN(pol) recognition by Nod2 is independent of TLR2 and vice versa. In both mutants IL-6 and IL-1B release was decreased by approximately 50% compared to wt MK, suggesting that the immune responses induced by Nod2 and TLR2 are comparable and that the two receptors act additively in MK. In TLR2-transfected HEK293 cells PGN(pol) induced NFkB-promoter fused luciferase expression. To support the data, co-localization and signaling studies were carried out with SHL-PGN, a lipase protein covalently tethered to PGN-fragments of varying sizes at its C-terminus. SHL-PGN also co-localized with Nod2 or TLR2 and induced their accumulation, while SHL without PGN did not. The results show that staphylococcal PGN not only co-localizes with Nod2 but also with TLR2. PGN is able to stimulate the immune system via both receptors.Maria Anna Müller-AnstettPatrick MüllerTill AlbrechtMulugeta NegaJeanette WagenerQiang GaoSusanne KaeslerMartin SchallerTilo BiedermannFriedrich GötzPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 10, p e13153 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Maria Anna Müller-Anstett Patrick Müller Till Albrecht Mulugeta Nega Jeanette Wagener Qiang Gao Susanne Kaesler Martin Schaller Tilo Biedermann Friedrich Götz Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.
description	In mammalian host cells staphylococcal peptidoglycan (PGN) is recognized by Nod2. Whether PGN is also recognized by TLR2 is disputed. Here we carried out PGN co-localization and stimulation studies with TLR2 and Nod2 in wild type and mutant host cells. To exclude contamination with lipoproteins, polymeric staphylococcal PGN (PGN(pol)) was isolated from Staphylococcus aureus Δlgt (lacking lipidated prelipoproteins). PGN(pol) was biotinylated (PGN-Bio) for fluorescence monitoring with specific antibodies. Keratinocytes from murine oral epithelium (MK) readily internalized PGN-Bio in an endocytosis-like process. In wt MK, PGN(pol) induced intracellular accumulation of Nod2 and TLR2 and co-localized with Nod2 and TLR2, but not with TLR4. In TLR2-deficient MK Nod2 and in Nod2-deficient MK TLR2 was induced, indicating that PGN(pol) recognition by Nod2 is independent of TLR2 and vice versa. In both mutants IL-6 and IL-1B release was decreased by approximately 50% compared to wt MK, suggesting that the immune responses induced by Nod2 and TLR2 are comparable and that the two receptors act additively in MK. In TLR2-transfected HEK293 cells PGN(pol) induced NFkB-promoter fused luciferase expression. To support the data, co-localization and signaling studies were carried out with SHL-PGN, a lipase protein covalently tethered to PGN-fragments of varying sizes at its C-terminus. SHL-PGN also co-localized with Nod2 or TLR2 and induced their accumulation, while SHL without PGN did not. The results show that staphylococcal PGN not only co-localizes with Nod2 but also with TLR2. PGN is able to stimulate the immune system via both receptors.
format	article
author	Maria Anna Müller-Anstett Patrick Müller Till Albrecht Mulugeta Nega Jeanette Wagener Qiang Gao Susanne Kaesler Martin Schaller Tilo Biedermann Friedrich Götz
author_facet	Maria Anna Müller-Anstett Patrick Müller Till Albrecht Mulugeta Nega Jeanette Wagener Qiang Gao Susanne Kaesler Martin Schaller Tilo Biedermann Friedrich Götz
author_sort	Maria Anna Müller-Anstett
title	Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.
title_short	Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.
title_full	Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.
title_fullStr	Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.
title_full_unstemmed	Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.
title_sort	staphylococcal peptidoglycan co-localizes with nod2 and tlr2 and activates innate immune response via both receptors in primary murine keratinocytes.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/e5b9da3504ee4234bf2ba68848690099
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Staphylococcal peptidoglycan co-localizes with Nod2 and TLR2 and activates innate immune response via both receptors in primary murine keratinocytes.

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