Pneumonia due to Chlamydia trachomatis in the immunocompromised (nude) mouse
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Abstract:
Athymic nude mice (nu/nu) were significantly more susceptible to pneumonia due to the agent of mouse pneumonitis (MoPn), Chlamydia trachomatis, than their heterozygous (nu/+) littermates, as judged both by a greater mortality and a decreased ability to rid their lungs of the infection. Nu/nu mice did not produce significant antibody to the MoPn agent, whereas nu/+ mice did. Thymic transplantation rendered nu/nu mice significantly more resistant to the MoPn agent than nu/nu controls. Resistance to the MoPn agent and production of specific antibody to the MoPn agent were dependent on thymus-derived cells.
Insights
Athymic nude mice (nu/nu) showed increased susceptibility to mouse pneumonitis (MoPn) infection, experiencing higher mortality and impaired pathogen clearance. Thymus transplantation restored resistance, indicating thymus-derived cells are crucial for immunity against MoPn.
Area of Science:
- Immunology
- Infectious Diseases
- Microbiology
Background:
- Athymic nude mice (nu/nu) lack a thymus, impacting T-cell development and immune responses.
- The agent of mouse pneumonitis (MoPn), a strain of Chlamydia trachomatis, causes respiratory infections in mice.
Purpose of the Study:
- To investigate the role of thymus-derived cells in resistance to MoPn infection.
- To determine if athymic nude mice exhibit altered susceptibility to MoPn compared to heterozygous littermates.
Main Methods:
- Comparison of mortality and lung infection clearance between athymic nude (nu/nu) and heterozygous (nu/+) mice after MoPn challenge.
- Assessment of antibody production against MoPn in both mouse groups.
- Evaluation of MoPn resistance in nu/nu mice following thymic transplantation.
Main Results:
- Nu/nu mice demonstrated significantly higher mortality and reduced ability to clear MoPn from lungs compared to nu/+ mice.
- Nu/nu mice produced minimal specific antibody to MoPn, while nu/+ mice produced significant levels.
- Thymic transplantation into nu/nu mice conferred significant resistance to MoPn infection.
Conclusions:
- Resistance to MoPn infection and specific antibody production are dependent on thymus-derived cells.
- T-cell immunity, mediated by thymus-derived cells, is essential for controlling Chlamydia trachomatis (MoPn) pneumonia.