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Related Experiment Videos

A labile transcriptional repressor modulates endotoxin tolerance

K E LaRue1, C E McCall

  • 1Department of Microbiology and Immunology, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina 27157.

The Journal of Experimental Medicine
|December 1, 1994
PubMed
Summary

Endotoxin tolerance, a state of reduced response to bacterial lipopolysaccharide (LPS), involves decreased interleukin-1 beta (IL-1 beta) gene expression. A rapidly degraded protein, likely I kappa B-alpha, actively represses IL-1 beta transcription during this tolerant state.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Bacterial lipopolysaccharide (LPS), also known as endotoxin, triggers inflammatory responses.
  • Tolerance to LPS is an adaptive cellular process leading to hyporesponsiveness.
  • This hyporesponsiveness is characterized by reduced cytokine production following LPS exposure.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying endotoxin tolerance in human cells.
  • To identify factors contributing to the downregulation of interleukin-1 beta (IL-1 beta) gene expression during LPS tolerance.
  • To explore the role of protein synthesis inhibition in reversing the tolerant phenotype.

Main Methods:

  • Utilized the human promonocytic cell line THP-1.

Related Experiment Videos

  • Measured LPS-induced interleukin-1 beta (IL-1 beta) transcription.
  • Assessed the effect of protein synthesis inhibition on IL-1 beta transcription.
  • Correlated cellular expression of I kappa B-alpha with IL-1 beta gene expression.

    • Main Results:

    • Endotoxin tolerance in THP-1 cells is associated with decreased LPS-induced IL-1 beta transcription.
    • Inhibition of protein synthesis restored IL-1 beta transcription, indicating a labile repressor.
    • Cellular expression of I kappa B-alpha correlated with the downregulation of IL-1 beta.
    • These findings suggest a dominant repressive role for a labile protein in endotoxin tolerance.

    Conclusions:

    • A labile protein acts as a dominant repressor, inhibiting transcription factors involved in IL-1 beta gene expression during endotoxin tolerance.
    • I kappa B-alpha is implicated as a potential candidate for this labile repressor.
    • Understanding this mechanism provides insights into the regulation of inflammatory responses and endotoxin tolerance.