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Soluble MD2 increases TLR4 levels on the epithelial cell surface.

Sabine Lauer1, Yuliya A Kunde, Theresa A Apodaca

  • 1Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, MS-M888, Los Alamos, NM 87545, USA.

Cellular Immunology
|October 11, 2008
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Summary

Soluble MD2 (sMD2) primes epithelial cells for immune response by increasing cell surface TLR4 levels. This priming occurs before LPS exposure, enhancing innate immunity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The accessory protein MD2 acts as a co-receptor with TLR4 for LPS binding, crucial for innate immune activation.
  • Epithelial cells, important in primary immune responses, express TLR4 but require soluble MD2 (sMD2) for functional receptor assembly.

Purpose of the Study:

  • To investigate the effect of sMD2 on TLR4 levels at the cell surface of epithelial cells.
  • To elucidate the mechanism by which sMD2 influences TLR4 cell surface expression and potential immune priming.

Main Methods:

  • HEK293 epithelial cells transfected with TLR4 were incubated with varying concentrations of sMD2.
  • Dose-response studies were conducted to determine optimal sMD2 concentrations for TLR4 modulation.
  • MD2 multimer formation and the effect of LPS on sMD2-stimulated cells were analyzed.

Main Results:

  • sMD2 incubation increased cell surface TLR4 levels on HEK293 cells in the absence of LPS.
  • A threshold sMD2 concentration (approx. 450 nM) maximized TLR4 levels, while higher concentrations (approx. 1800 nM) reduced them.
  • Increased MD2 multimerization at higher sMD2 concentrations and LPS-induced TLR4 downregulation via endocytosis were observed.

Conclusions:

  • sMD2 binds to TLR4, increasing its cell surface levels by inhibiting endocytic turnover.
  • sMD2 may prime epithelial cells for enhanced immune responsiveness prior to LPS exposure.
  • These findings offer insights into the role of sMD2 in innate immunity and epithelial cell function.