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Related Experiment Videos

Endotoxin: physical requirements for cell activation.

M Mueller1, B Lindner, R Dedrick

  • 1Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Department of Immunochemistry and Biochemical Microbiology, Division of Biophysics, Borstel, Germany.

Journal of Endotoxin Research
|November 3, 2005
PubMed
Summary

Lipopolysaccharide (LPS) aggregates, not monomers, are more potent activators of the innate immune response. This study demonstrates aggregates are significantly more active than monomers in stimulating TNF-alpha release from immune cells.

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Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Lipopolysaccharide (LPS) is a key component of Gram-negative bacteria outer membranes and a major trigger of innate immunity.
  • The biological activity of LPS monomers versus aggregates in immune cell activation remains controversial.
  • LPS exists as monomers below its critical micellar concentration (CMC) and forms aggregates above it.

Purpose of the Study:

  • To investigate whether LPS monomers or aggregates are the primary activators of immune cells.
  • To compare the immune-stimulating activity of defined LPS monomer and aggregate solutions.
  • To elucidate the mechanism of LPS-induced immune cell activation.

Main Methods:

  • Preparation of distinct LPS aggregate suspensions and monomer solutions using a dialysis setup.

Related Experiment Videos

  • Stimulation of human mononuclear cells (MNCs) with equal concentrations of Re LPS aggregates and monomers.
  • Quantification of TNF-alpha release as a measure of immune cell activation.

    • Main Results:

    • LPS aggregates demonstrated significantly higher TNF-alpha release compared to LPS monomers at identical concentrations.
    • This difference in activity was observed both in the absence and presence of serum proteins.
    • LPS aggregates are proposed to be detected by membrane-associated LPS-binding protein (LBP) for effective immune cell activation.

    Conclusions:

    • LPS aggregates are the predominant active form in initiating innate immune responses.
    • A model is proposed where LBP facilitates aggregate intercalation into cell membranes, leading to immune cell activation.
    • LBP's presence in or at the cell membrane of human macrophages supports this proposed mechanism.