Bordetella pertussis tracheal cytotoxin

Area of Science:

• Microbiology
• Cell Biology
• Pathology

Background:

• Pertussis (whooping cough) is characterized by damage to respiratory ciliated cells.
• Virulent *Bordetella pertussis* replicates this damage in hamster tracheal cultures.
• Known toxins from *B. pertussis* do not cause this specific cytopathology.

Purpose of the Study:

• To identify and purify the component responsible for *B. pertussis*-induced ciliated cell destruction.
• To characterize the biological activity and purification of this toxin.

Main Methods:

• Purification of a glycopeptide from *B. pertussis* culture supernatant.
• Infection of hamster tracheal organ cultures with purified toxin.
• Light and electron microscopy to assess cellular damage.
• Quantitative bioassay measuring inhibition of DNA synthesis in epithelial cells.

Main Results:

• A purified glycopeptide, Tracheal Cytotoxin (TCT), selectively destroys ciliated respiratory epithelial cells.
• TCT causes dose-dependent inhibition of DNA synthesis in hamster tracheal cells.
• A new purification method using column chromatography significantly increases TCT yield.

Conclusions:

• Tracheal Cytotoxin (TCT) is the primary agent responsible for the ciliated cell pathology in pertussis.
• TCT's selective activity provides a target for understanding and potentially treating pertussis.
• Improved purification methods enable larger-scale production of active TCT for further research.