Murine model of TB meningitis

Area of Science:

• Infectious Diseases
• Neurology
• Animal Models

Background:

• Central nervous system (CNS) infections from Mycobacterium tuberculosis (MTB) are severe forms of extrapulmonary TB (EPTB), leading to high mortality and neurological issues.
• Cerebral-TB cases are increasing, yet animal models for CNS-TB are limited.
• This study developed a murine model using a clinical MTB strain (C3) from cerebrospinal fluid (CSF) of CNS-TB patients.

Purpose of the Study:

• To develop and characterize a novel murine model for central nervous system tuberculosis (CNS-TB).
• To mimic the dissemination dynamics of MTB infection from the bloodstream to the brain.
• To provide a platform for studying CNS-TB pathogenesis and evaluating therapeutic interventions.

Main Methods:

• Mice were intravenously infected with a clinical MTB C3 strain, isolated from patient CSF.
• Bacterial burden, histopathology, and surrogate TB markers were assessed in brain and lung tissues at 30 and 50 days post-infection.

Main Results:

• Intravenous MTB C3 infection led to progressive CNS disease, with initial lung bacterial load followed by brain dissemination.
• Infected mice exhibited elevated mycobacterial antigens, antibodies, and T cell adenosine deaminase activity in the brain.
• A high mortality rate (60%) was observed in mice infected with the C3 strain.

Conclusions:

• A novel murine model for CNS-TB was successfully developed using the MTB C3 strain.
• The model replicates key events of extrapulmonary TB dissemination to the CNS.
• This model is crucial for advancing the understanding of CNS-TB pathogenesis and developing effective treatments.