Adult tuberculous meningitis. An immunological study

Area of Science:

• Immunology
• Infectious Diseases
• Neurology

Background:

• Tuberculous meningitis (TBM) is a severe form of tuberculosis affecting the central nervous system.
• Understanding the immune response in TBM is crucial for diagnosis and treatment.
• Previous studies have indicated alterations in immune function in various forms of tuberculosis.

Purpose of the Study:

• To investigate the cell-mediated and humoral immune responses in adult patients with tuberculous meningitis.
• To compare the immune status of TBM patients with those suffering from pulmonary tuberculosis and healthy controls.

Main Methods:

• Assessed delayed-type hypersensitivity (DTH) using DNCB (2,4-dinitrochlorobenzene) and tuberculin skin tests.
• Measured the lymphocyte migration inhibition (LMI) index.
• Quantified serum levels of Immunoglobulin G (IgG) and Immunoglobulin M (IgM).
• Compared results between adult TBM patients (n=10), pulmonary tuberculosis patients (n=20), and healthy adults (n=20).

Main Results:

• Delayed skin hypersensitivity to DNCB was significantly impaired in TBM patients, while tuberculin response remained unaltered.
• The lymphocyte migration inhibition (LMI) index was lower in TBM patients compared to both pulmonary tuberculosis patients and healthy adults, though the difference with pulmonary TB was not statistically significant.
• Serum IgG and IgM levels were elevated in TBM patients compared to healthy adults.
• IgM levels were specifically higher in TBM patients compared to pulmonary tuberculosis patients.

Conclusions:

• Adult tuberculous meningitis is associated with a significant impairment of cell-mediated immune response.
• There is an increased non-specific antibody response in adult tuberculous meningitis.
• The immune profile in TBM differs from pulmonary tuberculosis, particularly regarding antibody levels.