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Related Experiment Videos

Immunity to tuberculosis.

Robert J North1, Yu-Jin Jung

  • 1The Trudeau Institute, Saranac Lake, New York 12983, USA. rjnorth@northnet.org

Annual Review of Immunology
|March 23, 2004
PubMed
Summary
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Only a small percentage of humans are susceptible to tuberculosis (TB). Research suggests that impaired macrophage function, not insufficient Th1 immunity, may prevent TB resolution, complicating vaccine development.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Microbiology

Background:

  • Tuberculosis (TB) affects a small fraction of immunocompetent individuals, primarily manifesting as pulmonary disease.
  • Human immunodeficiency virus (HIV)-infected individuals are prone to severe, systemic TB.
  • Susceptible humans and animal models (mice, guinea pigs, rabbits) exhibit Th1 immunity but still develop progressive TB.

Purpose of the Study:

  • To investigate the underlying mechanisms of susceptibility and resistance to Mycobacterium tuberculosis (Mtb) infection.
  • To explore the role of macrophage function in controlling TB progression.
  • To assess the implications for developing effective TB vaccines.

Main Methods:

  • Comparative analysis of immune responses in susceptible and non-susceptible human populations.

Related Experiment Videos

  • Utilizing mouse, guinea pig, and rabbit models of TB to study disease progression.
  • Evaluating Th1 immune responses and macrophage functional capacity in the context of Mtb infection.

    • Main Results:

    • Tuberculosis in mice, guinea pigs, and rabbits mirrors the progressive lung disease seen in susceptible humans.
    • Despite generating Th1-mediated immunity, these models and susceptible humans fail to resolve Mtb infection.
    • Evidence suggests a potential intrinsic deficiency in macrophage function hindering the expression of immunity.

    Conclusions:

    • Inability to resolve Mtb infection may stem from macrophage dysfunction rather than inadequate Th1 cell numbers.
    • Current TB models in animals reflect disease in susceptible humans.
    • Developing effective vaccines for susceptible populations may be challenging due to these intrinsic immune deficiencies.