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Related Experiment Videos

Altered membrane fluidity in rat hepatocytes during endotoxic shock

R Salgia1, J H Becker, M M Sayeed

  • 1Dept. of Medicine, Johns Hopkins Univ. School of Medicine, Baltimore, MD 21205.

Molecular and Cellular Biochemistry
|April 21, 1993
PubMed
Summary

Bacterial endotoxins significantly decrease hepatocyte membrane fluidity in rats. Calcium channel blockers, like diltiazem, can prevent this endotoxin-induced alteration, suggesting a role for calcium homeostasis.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Bacterial endotoxins are potent mediators of inflammation and cellular dysfunction.
  • Hepatocyte membrane fluidity is crucial for cellular function and transport.
  • Endotoxin exposure can disrupt cellular homeostasis, including calcium regulation.

Purpose of the Study:

  • To investigate the in vivo effects of bacterial endotoxins on rat hepatocyte membrane fluidity.
  • To determine if calcium channel blockers can mitigate endotoxin-induced changes in membrane fluidity.
  • To explore the role of cellular calcium homeostasis in maintaining membrane properties.

Main Methods:

  • Steady-state fluorescence anisotropy using 1,6-diphenyl-1,3,4-hexatriene (DPH) probe.
  • Measurements in isolated rat hepatocytes and plasma membrane preparations.

Related Experiment Videos

  • In vivo administration of Salmonella enteritidis endotoxin and diltiazem in rats.

    • Main Results:

    • Endotoxin significantly increased fluorescence anisotropy (rs) and microviscosity (eta) in rat hepatocytes and liver plasma membranes.
    • Diltiazem treatment normalized anisotropy and microviscosity values in endotoxin-exposed rats.
    • Reduced membrane fluidity was observed across a temperature range of 5-40°C.

    Conclusions:

    • Bacterial endotoxins significantly decrease hepatocyte membrane fluidity in vivo.
    • Calcium channel blockers effectively prevent endotoxin-induced alterations in membrane fluidity.
    • Cellular calcium homeostasis is likely critical for maintaining hepatocyte membrane fluidity and function.