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Pathogenicity of Mycoplasma pulmonis in ependymal organ culture
Abstract:
Ependymal organ culture was used as a model to study the effect of Mycoplasma pulmonis on the ciliated ependyma of the rat. Reduced ciliary activity or ciliostasis occurred 48 to 72 h after infection. Scanning electron microscopy showed that numerous organisms were associated with the cytoplasmic membrane of host cells beginning at 24 h, and transmission electron microscopy indicated that M. pulmonis cytadsorbs to the cell surface. Lesions observed in the organ cultures were limited to changes at the cell surface. These changes included reduction in microvilli density, matting of cilia into bundles, collapse of the cilia onto the cell surface, deciliation of the ependymal cells, and flattening of the cell surface. The results indicated that the response of the ependymal cell to M. pulmonis is similar to that which occurrs in Mycoplasma-infected tracheal and oviduct organ culture systems.
Insights
Mycoplasma pulmonis infection in rat ependymal organ cultures caused reduced ciliary activity and cell surface damage. These findings reveal similar pathological effects as seen in other Mycoplasma-infected tissues.
Area of Science:
- Microbiology
- Cell Biology
- Pathology
Background:
- Mycoplasma pulmonis is a common respiratory pathogen.
- Ciliated epithelia are crucial for mucociliary clearance.
- Understanding Mycoplasma's effect on ependyma is important for neurological research.
Purpose of the Study:
- To investigate the effects of Mycoplasma pulmonis on rat ependymal organ cultures.
- To characterize the cellular changes induced by M. pulmonis infection.
Main Methods:
- Organotypic culture of rat ependyma.
- Infection with Mycoplasma pulmonis.
- Scanning and transmission electron microscopy (SEM/TEM).
Main Results:
- Ciliostasis (reduced ciliary activity) observed 48-72 hours post-infection.
- M. pulmonis cytadsorbed to ependymal cell surfaces starting at 24 hours.
- Observed lesions included reduced microvilli, ciliary matting, deciliation, and cell surface flattening.
Conclusions:
- Mycoplasma pulmonis causes significant damage to ciliated ependymal cells.
- The observed ependymal cell response mirrors that in Mycoplasma-infected tracheal and oviduct cultures.
- Ependymal organ cultures serve as a valid model for studying Mycoplasma-induced ciliotoxicity.