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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Related Experiment Video

Updated: Jan 2, 2026

Endotoxin Activity Assay for the Detection of Whole Blood Endotoxemia in Critically Ill Patients
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Endotoxin Activity Assay for the Detection of Whole Blood Endotoxemia in Critically Ill Patients

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SHIP, TGF-beta, and endotoxin tolerance.

Bruce Beutler1

  • 1Department of Immunology, IMM31, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.

Immunity
|August 17, 2004
PubMed
Summary

Endotoxin tolerance, a state of reduced responsiveness to lipopolysaccharide (LPS), requires the cytosolic phosphatase SHIP. This finding advances understanding of LPS signaling and macrophage refractoriness.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Endotoxin (lipopolysaccharide; LPS) research spans over a century.
  • Endotoxin tolerance is a complex phenomenon that has long intrigued scientists.
  • Previous research has not fully elucidated the molecular mechanisms underlying LPS tolerance.

Purpose of the Study:

  • To investigate the role of the cytosolic phosphatase SHIP in the development of endotoxin tolerance.
  • To enhance the comprehension of lipopolysaccharide (LPS) signaling pathways.
  • To identify key regulators of LPS-induced refractoriness in immune cells.

Main Methods:

  • Investigated the function of the cytosolic phosphatase SHIP in macrophages and mice.
  • Utilized models to study the development of an LPS-refractory state.

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Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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  • Analyzed molecular mechanisms of LPS signaling.

    • Main Results:

    • Demonstrated that SHIP is essential for the establishment of an LPS-refractory state.
    • Showed that SHIP's activity is required for macrophages and mice to become tolerant to LPS.
    • Provided evidence linking SHIP to the regulation of LPS signaling.

    Conclusions:

    • The cytosolic phosphatase SHIP plays a critical role in mediating endotoxin tolerance.
    • SHIP is a key molecular component required for the development of LPS refractoriness.
    • This study advances our understanding of LPS biology and immune tolerance mechanisms.