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[Factors influencing the susceptibility of mice to Mycoplasma arthritidis]
Abstract:
Concentrated broth constituents markedly enhanced the development of abscesses after subcutaneous injection of Mycoplasma arthritidis. Under appropriate conditions, both virulent and avirulent strains of M. arthritidis produced toxic effects in mice, as detected by the development of necrotic abscesses and death of the animals. The treatment of mice at birth with M. arthritidis antigens rendered the animals more susceptible to infection with M. arthritidis later in life, as evidenced by increased arthritis after intravenous injection. The injection of M. arthritidis into pregnant mice resulted in a high incidence of abortions. Comparative studies using different mouse strains showed that DBA mice were the most susceptible and BALB/c and C57BL mice were the most resistant to infection by M. arthritidis.
Insights
Mycoplasma arthritidis infection causes toxic effects, including abscesses and death, in mice. Early exposure to M. arthritidis antigens increases susceptibility to later infections and arthritis.
Area of Science:
- Microbiology
- Immunology
- Veterinary Pathology
Background:
- Mycoplasma arthritidis is a pathogen known to cause arthritis in various animal models.
- Understanding the pathogenesis and host-pathogen interactions of M. arthritidis is crucial for disease management.
Purpose of the Study:
- To investigate the pathogenicity of Mycoplasma arthritidis in mice.
- To determine the factors influencing M. arthritidis infection severity and host susceptibility.
- To evaluate the effects of M. arthritidis on pregnant mice and their offspring.
Main Methods:
- Subcutaneous and intravenous injections of Mycoplasma arthritidis strains into different mouse strains.
- Administration of M. arthritidis antigens to neonatal mice.
- Monitoring for abscess development, necrotic lesions, mortality, arthritis, and abortions.
Main Results:
- Concentrated broth constituents enhanced abscess formation.
- Both virulent and avirulent M. arthritidis strains induced toxic effects, including necrotic abscesses and death.
- Neonatal exposure to M. arthritidis antigens led to increased susceptibility and arthritis in adult mice.
- Infection of pregnant mice resulted in a high incidence of abortions.
- DBA mice were most susceptible, while BALB/c and C57BL mice were most resistant.
Conclusions:
- Mycoplasma arthritidis exhibits significant pathogenicity in mice, inducing severe toxic effects and potentially reproductive complications.
- Host factors, including genetic background and early-life immune exposure, critically influence susceptibility to M. arthritidis infection.
- These findings highlight the complex interplay between M. arthritidis and the host immune system, informing future research on pathogenesis and control strategies.