Related Experiment Videos
Entry of Shiga toxin into cells
K Sandvig1, E Dubinina, O Garred
1Institute for Cancer Research, Norwegian Radium Hospital, Montebello, Oslo.
Zentralblatt Fur Bakteriologie : International Journal of Medical Microbiology
|April 1, 1993
Summary
Shiga toxin
Area of Science:
- Cellular Biology
- Toxicology
- Molecular Biology
Background:
- Shiga toxin (ST) is a potent bacterial toxin responsible for severe gastrointestinal and systemic illness.
- Understanding ST's cellular entry and processing is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the role of Shiga toxin's A fragment processing in its toxicity.
- To explore mechanisms of Shiga toxin cellular entry and intoxication, particularly in sensitized cells.
Main Methods:
- Utilized Shiga toxin mutants with deletions in the A fragment.
- Assessed toxin toxicity and cellular processing in various cell lines (Vero, A431).
- Investigated the effect of butyric acid treatment on cell sensitization and toxin transport.
Main Results:
- A mutant lacking a specific A fragment region showed resistance to trypsin cleavage and reduced toxicity.
- Cellular processing of the Shiga toxin A fragment is essential for high toxicity.
- A431 cells, normally resistant, can be sensitized to Shiga toxin, requiring transport to the Golgi apparatus.
Conclusions:
- The processing of the Shiga toxin A fragment is critical for its potent cytotoxic effects.
- Retrograde transport to the Golgi and endoplasmic reticulum (ER) is implicated in Shiga toxin intoxication of sensitized cells.