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Mycoplasma-virus interrelationships in mouse tracheal organ cultures
Abstract:
The effects produced by single and mixed infections with Mycoplasma pulmonis and influenza A/PR-8 virus were studied in mouse tracheal organ cultures. M. pulmonis multiplied in the tracheal organ cultures, producing inhibition of ciliary activity and histologic tissue damage. The organism grew in close association with the cell membranes but did not appear to attach directly to the membranes or the cilia. Influenza A virus also replicated in tracheal organ cultures, producing ciliary inhibition and more extensive cytopathologic changes. Virus particles were seen by electron microscopy to attach to and cause clumping of the cilia. Simultaneous infection of the organ cultures with mycoplasma and virus resulted in more rapid inactivation of ciliary activity and greater tissue damage than occurred when the cultures were infected with only mycoplasma or virus. Presence of the virus appeared to have no effect on the growth of the mycoplasma; however, the mycoplasma partially interfered with virus replication.
Insights
This study shows that combined Mycoplasma pulmonis and influenza A virus infections in mouse tracheal cultures cause faster ciliary dysfunction and tissue damage than single infections. Mycoplasma pulmonis partially inhibited influenza A virus replication.
Area of Science:
- Microbiology
- Virology
- Pathology
Background:
- Mycoplasma pulmonis and influenza A virus are significant respiratory pathogens.
- Understanding their individual and combined effects on the respiratory tract is crucial for disease management.
Purpose of the Study:
- To investigate the synergistic or antagonistic effects of Mycoplasma pulmonis and influenza A virus in a mouse tracheal organ culture model.
- To characterize the impact of single and mixed infections on ciliary activity and tissue integrity.
Main Methods:
- Mouse tracheal organ cultures were infected with Mycoplasma pulmonis, influenza A/PR-8 virus, or both.
- Ciliary activity, organism growth, and histologic tissue damage were assessed.
- Electron microscopy was used to visualize viral and mycoplasma interactions with host cells.
Main Results:
- Mycoplasma pulmonis infection inhibited ciliary activity and caused histologic damage.
- Influenza A virus replicated, inhibited ciliary activity, and induced cytopathologic changes, with viral attachment to cilia observed.
- Mixed infections led to accelerated ciliary inactivation and increased tissue damage compared to single infections.
- Mycoplasma pulmonis growth was unaffected by the virus, but the mycoplasma partially inhibited viral replication.
Conclusions:
- Combined Mycoplasma pulmonis and influenza A virus infections have a synergistic detrimental effect on mouse tracheal tissue.
- Mycoplasma pulmonis can partially impede influenza A virus replication, suggesting complex host-pathogen interactions.
- These findings highlight the importance of considering polymicrobial infections in respiratory disease pathogenesis.