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Mycoplasma pulmonis infection in the brains of rodents
Abstract:
Mycoplasma pulmonis was frequently present in the brains of both naturally and experimentally infected rats. Recovery of mycoplasmas from the brain was more common than from the lungs, except when there was a mixed respiratory tract infection or when immunodeficient rats were used and they developed chronic respiratory disease. After intranasal infection the mycoplasmas could be recovered from the olfactory lobes before the rest of the brain. Most of the organisms were demonstrated in small groups in the sinuses and blood vessels of the brain, apparently adhering to the epithelium; a few were present in the lumen. The presence of some mycoplasmas outside the blood vessels and attached to cells in tissue showed that the blood-brain barrier can be crossed. Three days after intranasal inoculation, most organisms lined the nasal mucosa, but a few were seen close to neurons, on cells in the olfactory lobes, and in blood vessels.
Insights
Mycoplasma pulmonis frequently infected rat brains, often more than lungs. This bacterium can cross the blood-brain barrier, reaching neural tissues after intranasal infection.
Area of Science:
- Neuroscience
- Infectious Diseases
- Microbiology
Background:
- Mycoplasma pulmonis is a common respiratory pathogen in rodents.
- The tropism and central nervous system (CNS) invasion patterns of M. pulmonis are not fully understood.
- Rodent models are crucial for studying respiratory infections and their systemic effects.
Purpose of the Study:
- To investigate the presence and distribution of Mycoplasma pulmonis in the brains of infected rats.
- To determine if M. pulmonis can cross the blood-brain barrier.
- To understand the initial sites of infection within the CNS after intranasal inoculation.
Main Methods:
- Rats were infected naturally or experimentally with Mycoplasma pulmonis.
- Mycoplasma recovery was assessed from brain and lung tissues.
- Histological examination was performed to visualize organism location within brain tissues.
- Intranasal inoculation was used to track early infection dynamics.
Main Results:
- Mycoplasma pulmonis was frequently recovered from rat brains, often more so than from lungs.
- Infection of the olfactory lobes preceded detection in other brain regions after intranasal inoculation.
- Organisms were observed adhering to sinus and blood vessel epithelium, and some were found outside blood vessels, indicating blood-brain barrier penetration.
- M. pulmonis was detected near neurons and on cells in the olfactory lobes.
Conclusions:
- Mycoplasma pulmonis readily invades the brains of infected rats.
- The olfactory pathway is an important route for M. pulmonis to reach the CNS.
- Evidence suggests M. pulmonis can actively cross the blood-brain barrier.