Immunological features of tuberculosis.

Area of Science:

• Immunology
• Infectious Diseases
• Cell Biology

Background:

• Cell-mediated immunity plays a crucial role in controlling infections like tuberculosis.
• Assessing immune responses in tuberculosis patients is vital for understanding disease progression and developing treatments.

Purpose of the Study:

• To investigate specific aspects of cell-mediated immunity in patients with active pulmonary tuberculosis.
• To compare immune function between tuberculosis patients and healthy individuals.

Main Methods:

• Evaluated DNCB sensitization, PPD skin test, Lymphoid Intercellular Factor (LIF) determination, E-rosette, and EAC-rosette formation.
• Assessed lymphocyte survival in culture for up to 48 hours.
• Compared results between 51 tuberculosis patients and 30 healthy volunteers from Mexico.

Main Results:

• Tuberculosis patients had a significantly higher frequency of positive PPD skin tests (p = 0.0000004) but a lower response to DNCB sensitization (p = 0.006).
• No significant impairment was observed in LIF production or E-rosette formation.
• Lymphocyte survival in culture was significantly reduced in tuberculosis patients (p = 0.05), particularly in those with cavitated and infiltrative lesions (p = 0.015 and 0.02).

Conclusions:

• Active pulmonary tuberculosis is associated with specific impairments in cell-mediated immunity, including reduced DNCB response and diminished lymphocyte viability.
• The observed decrease in lymphocyte survival suggests the presence of a functionally compromised cell population in tuberculosis patients.
• Further research is needed to elucidate the precise mechanisms underlying these immune deficits and their clinical implications.