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Updated: Aug 8, 2026
Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction
Published on: May 28, 2012
Lipopolysaccharide interactions with lysozyme differentially affect lipopolysaccharide immunostimulatory activity
1Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City.
Insights
Lysozyme inhibits immunostimulatory activities of lipopolysaccharide (LPS) in a structure-dependent manner. It effectively suppresses Re-LPS and lipid A activities but not S-LPS or Ra-LPS.
Area of Science:
- Immunology
- Biochemistry
Background:
- Lipopolysaccharide (LPS) is a key component of Gram-negative bacteria.
- LPS exhibits potent immunostimulatory activities, influencing B-lymphocyte and macrophage functions.
- Lysozyme is an enzyme known to interact with LPS.
Purpose of the Study:
- To investigate the effect of lysozyme-LPS complex formation on LPS-mediated immunostimulatory activities.
- To determine if lysozyme differentially affects LPS structures regarding immune stimulation.
Main Methods:
- In vitro investigation of B-lymphocyte proliferation and differentiation.
- Assessment of macrophage production of lymphocyte-activating factor.
- Comparative analysis of lysozyme's effect on different LPS structures (Re-LPS, S-LPS, Ra-LPS) and lipid A.
Main Results:
- Lysozyme dose-dependently inhibited Re-LPS and lipid A-dependent immunostimulatory activities.
- S-LPS and Ra-LPS immunostimulatory activities remained unaffected by lysozyme.
- Observed differences were not due to variations in lysozyme binding to LPS or target cells.
Conclusions:
- Lysozyme's inhibitory effect on LPS immunostimulation is LPS structure-specific.
- The initial interactions between LPS and immune cells may vary depending on LPS structure and lipid A.
Abstract:
The effect of complex formation between lysozyme and lipopolysaccharide (LPS) on the immunostimulatory activities of LPS have been investigated in vitro. Three prototype immunostimulatory activities were examined: B-lymphocyte proliferation, B-lymphocyte differentiation and macrophage production of lymphocyte-activating factor activity. Different effects of lysozyme were noted, depending upon the structure of the LPS, even though previous studies have established that all LPS preparations readily bind lysozyme. Both Re-LPS- and lipid-A-dependent immunostimulatory activities were readily inhibited by lysozyme in a dose-dependent fashion. In contrast, S-LPS and Ra-LPS were unaffected in their immunostimulatory activities by lysozyme. These differences were not the result of quantitative differences in LPS binding of lysozyme, or effects of lysozyme on overall binding of LPS to target cells. These data suggest that the factors which dictate the initial interactions between LPS and lymphoreticular cells may not be identical for all LPS preparations and/or purified lipid A.
