[Electron microscopic study of the cytopathogenic action of meningococci in a continuous human amnion cell culture]
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Abstract:
The electron-microscopic study of the interaction of meningococci with continuous human amnion cell culture F1 has revealed that this process comprises 3 stages. The study has shown that, following the adhesion of meningococci to the surface of cells F1, these cells are invaded by individual coccal forms of meningococci. In response to infection vacuoles appear in the cytoplasm of the cells. Meningococci are either phagocytosed inside these vacuoles, or their release into the intercellular space and the death of the infected by meningococci are observed. When the cells are infected by cytopathogenic strains, the infectious process results in the appearance of degenerative changes in the cells.
Insights
This study details how meningococci interact with human amnion cells, revealing a three-stage process of invasion, vacuole formation, and cell death or recovery. It highlights the impact of cytopathogenic strains on cell integrity.
Area of Science:
- Microbiology
- Cell Biology
- Electron Microscopy
Background:
- Neisseria meningitidis (meningococci) are significant human pathogens.
- Understanding host-pathogen interactions is crucial for developing effective treatments.
Purpose of the Study:
- To elucidate the stages of meningococcal interaction with human amnion cells.
- To observe the cellular response to meningococcal infection using electron microscopy.
Main Methods:
- Electron microscopy was used to study the interaction.
- Continuous human amnion cell culture (F1) was utilized as the host model.
- Infection was induced using meningococci, including cytopathogenic strains.
Main Results:
- The interaction follows a 3-stage process: adhesion, invasion, and intracellular events.
- Vacuoles form in the cytoplasm, containing meningococci or facilitating their release.
- Cytopathogenic strains cause degenerative changes and cell death.
Conclusions:
- Meningococcal invasion involves distinct cellular mechanisms.
- The host cell's response dictates the outcome of the infection.
- Electron microscopy provides detailed insights into host-pathogen dynamics.