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Related Experiment Videos

Cellular internalisation of Clostridium difficile toxin A.

B Henriques1, I Florin, M Thelestam

  • 1Department of Bacteriology, Karolinska Institutet, Stockholm, Sweden.

Microbial Pathogenesis
|June 1, 1987
PubMed
Summary

Clostridium difficile toxin A causes cell damage in human lung fibroblasts. The toxin requires cell entry and acidic conditions for activation, suggesting an endosomal pathway.

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Area of Science:

  • Cell Biology
  • Microbiology
  • Toxicology

Background:

  • Clostridium difficile is a significant cause of antibiotic-associated diarrhea.
  • Toxin A is a primary virulence factor of Clostridium difficile.
  • Understanding toxin A's mechanism is crucial for developing treatments.

Purpose of the Study:

  • To investigate the mechanism of cytopathogenic effect of Clostridium difficile toxin A.
  • To determine the cellular processes involved in toxin A-induced cell damage.
  • To identify factors influencing toxin A activity in cultured cells.

Main Methods:

  • Studied the cytopathogenic effect of toxin A on human lung fibroblasts.
  • Assessed the impact of toxin concentration, exposure time, and temperature.
  • Utilized cell mutants and chemical agents to probe cellular pathways.

Main Results:

  • Cytopathogenic effect was dependent on toxin concentration and exposure time.
  • Toxin binding occurred at both 0°C and 37°C, with dose-dependent latency.
  • Low extracellular pH and endosomal acidification were critical for toxin activation and effect.

Conclusions:

  • Cellular internalization of toxin A is essential for its cytopathogenic effect.
  • Toxin A likely undergoes enzymatic activation in an acidic cellular compartment, possibly endosomes.
  • These findings elucidate a key step in Clostridium difficile pathogenesis.

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