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  Nanoscale distribution of TLR4 on primary human macrophages stimulated with LPS and ATI

Neumann, J., Ziegler, K., Gelleri, M., Fröhlich-Nowoisky, J., Liu, F., Bettinghausen, I., et al. (2019). Nanoscale distribution of TLR4 on primary human macrophages stimulated with LPS and ATI. Nanoscale, 11(19), 9769-9779. doi:10.1039/c9nr00943d.

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 Creators:
Neumann, Jan1, Author              
Ziegler, Kira1, Author              
Gelleri, Marton2, Author
Fröhlich-Nowoisky, Janine1, Author              
Liu, Fobang1, Author              
Bettinghausen, Iris2, Author
Schuppan, Detlef2, Author
Birk, Udo2, Author
Pöschl, Ulrich1, Author              
Cremer, Christoph2, Author
Lucas, Kurt1, Author              
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
2external, ou_persistent22              

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 Abstract: Toll-like receptor 4 (TLR4) plays a crucial role in the recognition of invading pathogens. Upon activation by lipopolysaccharides (LPS), TLR4 is recruited into specific membrane domains and dimerizes. In addition to LPS, TLR4 can be stimulated by wheat amylase-trypsin inhibitors (ATI). ATI are proteins associated with gluten containing grains, whose ingestion promotes intestinal and extraintestinal inflammation. However, the effect of ATI vs. LPS on the membrane distribution of TLR4 at the nanoscale has not been analyzed. In this study, we investigated the effect of LPS and ATI stimulation on the membrane distribution of TLR4 in primary human macrophages using single molecule localization microscopy (SMLM). We found that in unstimulated macrophages the majority of TLR4 molecules are located in clusters, but with donor-dependent variations from ∼51% to ∼75%. Depending on pre-clustering, we found pronounced variations in the fraction of clustered molecules and density of clusters on the membrane upon LPS and ATI stimulation. Although clustering differed greatly among the human donors, we found an almost constant cluster diameter of ∼44 nm for all donors, independent of treatment. Together, our results show donor-dependent but comparable effects between ATI and LPS stimulation on the membrane distribution of TLR4. This may indicate a general mechanism of TLR4 activation in primary human macrophages. Furthermore, our methodology visualizes TLR4 receptor clustering and underlines its functional role as a signaling platform.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000468868200055
DOI: 10.1039/c9nr00943d
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Title: Nanoscale
  Abbreviation : Nanoscale
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 11 (19) Sequence Number: - Start / End Page: 9769 - 9779 Identifier: ISSN: 2040-3364
CoNE: https://pure.mpg.de/cone/journals/resource/2040-3364