Related Experiment Videos
Attachment of Mycoplasma pneumoniae to respiratory epithelium
Abstract:
The attachment of radioisotope-labeled Mycoplasma pneumoniae to hamster tracheal rings in organ culture was examined by radioautography and liquid scintillation counting. Radioautographs of individual rings exposed for 8 h to (3H) thymidine-labeled virulent M. pneumoniae revealed a dense extracellular collection of emulsion grains along the luminal surface of epithelial cells. Similar exposure of rings to isotope-labeled avirulent M. pneumoniae resulted in no accumulation of emulsion grains. The numbers of attached virulent mycoplasmas, as measured by liquid scintillation counting of infected rings, were found to increase in a nearly linear fashion over an 8-h incubation period. Viability of the mycoplasmas and metabolic integrity of the tracheal rings were important for optimal attachment. Pretreatment of rings with neuraminidase or sodium periodate significantly impaired orgainism adherence. These data suggest a specificity of interation between virulent M. pneumoniae and tracheal epithelial cells that can be further examined through the use of isotopically labeled mycoplasmas.
Insights
Virulent Mycoplasma pneumoniae attaches to hamster tracheal cells, while avirulent strains do not. This specific interaction is crucial for understanding respiratory infections and requires viable mycoplasmas and host cells.
Area of Science:
- Microbiology
- Cell Biology
- Respiratory Medicine
Background:
- Mycoplasma pneumoniae is a significant cause of respiratory illness.
- Understanding the initial attachment mechanisms of M. pneumoniae to host cells is vital for developing effective treatments.
Purpose of the Study:
- To investigate the specific attachment of virulent and avirulent Mycoplasma pneumoniae to hamster tracheal rings.
- To elucidate the factors influencing the adherence of M. pneumoniae to respiratory epithelial cells.
Main Methods:
- Organ culture of hamster tracheal rings.
- Labeling of Mycoplasma pneumoniae with radioisotopes (3H thymidine).
- Detection of mycoplasma attachment using radioautography and liquid scintillation counting.
Main Results:
- Virulent M. pneumoniae showed significant adherence to the luminal surface of epithelial cells, visualized by radioautography.
- Avirulent M. pneumoniae did not accumulate on the tracheal rings.
- Attachment of virulent M. pneumoniae increased linearly over an 8-hour period.
- Mycoplasma viability and tracheal ring integrity were essential for optimal attachment.
- Neuraminidase and sodium periodate treatments reduced mycoplasma adherence, suggesting specific molecular interactions.
Conclusions:
- Virulent Mycoplasma pneumoniae exhibits specific adherence to hamster tracheal epithelial cells.
- The interaction is dependent on mycoplasma viability, host cell integrity, and potentially involves specific cell surface molecules.
- Isotopically labeled mycoplasmas provide a valuable tool for studying these host-pathogen interactions.