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Monomeric endotoxin:protein complexes are essential for TLR4-dependent cell activation.

T L Gioannini1, A Teghanemt, DeS Zhang

  • 1Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa 52241, USA. theresa-gioannini@uiowa.edu

Journal of Endotoxin Research
|June 14, 2005
PubMed
Summary

Gram-negative bacterial endotoxin activates Toll-like receptor 4 (TLR4) via sequential protein interactions. Monomeric endotoxin:MD-2 complexes are the key agonists, with acylation level influencing potency.

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Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Potent cell activation by Gram-negative bacterial endotoxin relies on interactions with LBP, CD14, MD-2, and TLR4.
  • LBP and CD14 extract endotoxin, forming monomeric endotoxin:CD14 complexes for MD-2 transfer.

Purpose of the Study:

  • To elucidate the mechanism of endotoxin presentation and activation of TLR4.
  • To investigate the role of endotoxin acylation in modulating TLR4 agonist potency.

Main Methods:

  • Studied endotoxin-protein interactions involving LBP, CD14, MD-2, and TLR4.
  • Utilized albumin-dependent and independent assays to analyze complex formation and cell activation.
  • Compared the activity of differently acylated meningococcal endotoxin (LOS) forms.

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Main Results:

  • Monomeric endotoxin:MD-2 complexes are the primary TLR4 agonists, activating TLR4 at picomolar concentrations.
  • Albumin facilitates endotoxin transfer to MD-2, forming the active complex.
  • Under-acylated LOS:MD-2 complexes exhibit reduced TLR4 agonist potency compared to hexa-acylated forms.

Conclusions:

  • The formation of monomeric endotoxin:MD-2 complexes is crucial for TLR4 activation.
  • The degree of endotoxin acylation directly impacts the potency of TLR4 agonism.