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Related Experiment Videos

Staphylococcal alpha toxin: a study with chronically instrumented awake sheep.

S Harshman1, P L Lefferts, J R Snapper

  • 1Department of Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-2363.

Infection and Immunity
|September 1, 1992
PubMed
Summary

Staphylococcal alpha toxin causes acute heart failure and death in sheep at doses between 15-25 micrograms/kg. This study details the dose-response relationship and lethal effects of alpha toxin in vivo.

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Area of Science:

  • Toxicology
  • Cardiovascular Physiology
  • Infectious Disease

Background:

  • Staphylococcal alpha toxin is a major virulence factor.
  • Understanding its in vivo effects is crucial for treating staphylococcal infections.

Purpose of the Study:

  • To characterize the in vivo dose-response effects of staphylococcal alpha toxin in sheep.
  • To identify the mechanisms underlying alpha toxin-induced mortality.

Main Methods:

  • 15 chronically instrumented awake yearling sheep underwent 30 experiments.
  • Staphylococcal alpha toxin was infused, and responses were categorized.
  • Key physiological parameters including pulmonary artery pressure, lung lymph flow, and left atrial pressure were monitored.

Main Results:

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  • Responses ranged from no effect to pressor response, altered fluid exchange, and acute heart failure leading to death.
  • A steep dose-response curve was observed, with a narrow lethal window (15-25 µg/kg).
  • Acute left heart failure, indicated by elevated left atrial pressure, was the primary cause of death.

Conclusions:

  • Staphylococcal alpha toxin induces acute heart failure in sheep.
  • Lethal effects may stem from direct cardiac or coronary vasculature toxicity.
  • The narrow dose-response window highlights the potent toxicity of alpha toxin.