Immune Response Dynamics in Mycobacterium Tuberculosis Infection

The immune response to Mycobacterium tuberculosis unfolds as a complex interplay between innate defences and adaptive mechanisms. Initial infection of alveolar macrophages triggers recruitment of neutrophils, natural killer cells and dendritic cells, which together constrain early bacterial replication but may also promote tissue damage. Antigen presentation by infected macrophages and dendritic cells initiates a Th1-biased adaptive response dominated by interferon-γ and tumour necrosis factor, leading to activation of infected macrophages and formation of organised granulomas. These multicellular structures serve both to wall off bacilli and to create microenvironments that can foster persistence. A balance between pro-inflammatory and regulatory cytokines determines whether infection is contained in a latent state, eradicated or progresses to active disease. Heterogeneity in granuloma composition and T cell receptor repertoires further shapes individual outcomes, informing both vaccine design and host-directed therapies.

Research from Nature Portfolio

Recent studies employing single-cell and bulk T cell receptor sequencing have delineated groups of T cell clonotypes whose specificity correlates either with durable control of infection or with progression to disease. By mapping the antigenic targets of these receptors, researchers have prioritised candidate peptides for next-generation vaccines. In parallel, investigations of intravenous Bacille Calmette–Guérin (BCG) vaccination in simian immunodeficiency virus-infected macaques revealed rapid influx of airway T cells and elevated mucosal and systemic antibody titres, leading to early clearance of Mycobacterium tuberculosis upon challenge, independent of underlying viral co-infection. Foundational work in non-human primates demonstrated that intravenous BCG induces high-frequency antigen-responsive CD4 and CD8 T cells throughout lung parenchyma and lymphoid tissues, preventing detectable infection in most vaccinated subjects and providing a benchmark for immune correlates of protection.

Immune Response Dynamics in Mycobacterium Tuberculosis Infection publication trend

The graph below shows the total number of articles in immune response dynamics in mycobacterium tuberculosis infection across all publications each year (not limited to Nature Index journals).

Technical terms

Innate immunity: The host’s first line of defence, involving non-specific cells such as neutrophils, macrophages and natural killer cells.

Adaptive immunity: Antigen-specific responses mediated by B and T lymphocytes, characterised by memory and specificity.

Granuloma: A structured aggregate of immune cells that sequesters Mycobacterium tuberculosis but can also permit bacillary survival.

Cytokine: Small signalling proteins, such as interferon-γ or tumour necrosis factor, that coordinate immune cell functions.

T cell receptor (TCR): Antigen-recognising molecule on T lymphocytes that determines specificity for peptide–MHC complexes.

Bacille Calmette–Guérin (BCG): A live-attenuated vaccine strain of Mycobacterium bovis used to induce protective immunity against tuberculosis.

References

1. T cell receptor repertoires associated with control and disease progression following Mycobacterium tuberculosis infection. Nature Medicine (2023).
2. Intravenous Bacille Calmette–Guérin vaccination protects simian immunodeficiency virus-infected macaques from tuberculosis. Nature Microbiology (2023).
3. Prevention of tuberculosis in macaques after intravenous BCG immunization. Nature (2020).
4. Characterizing the immune response to Mycobacterium tuberculosis: a comprehensive narrative review and implications in disease relapse. Frontiers in Immunology (2024).
5. Multimodal profiling of lung granulomas in macaques reveals cellular correlates of tuberculosis control. Immunity (2022).
6. The Importance of First Impressions: Early Events in Mycobacterium tuberculosis Infection Influence Outcome. mBio (2016).
7. Variability in Tuberculosis Granuloma T Cell Responses Exists, but a Balance of Pro- and Anti-inflammatory Cytokines Is Associated with Sterilization. PLOS Pathogens (2015).