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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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A Functional Role for Antibodies in Tuberculosis.

Lenette L Lu1, Amy W Chung2, Tracy R Rosebrock3

  • 1Ragon Institute of MGH, MIT, and Harvard, Cambridge, MA 02139, USA; Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, USA.

Cell
|September 27, 2016
PubMed
Summary

Antibodies in tuberculosis (TB) infection show distinct patterns between latent TB infection and active TB disease. These differences in antibody function, particularly Fc-mediated effector functions, may play a crucial role in controlling Mycobacterium tuberculosis.

Keywords:
Fc-receptorsantibodiesinflammasomeinnate immunitytuberculosis

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Microbiology

Background:

  • Tuberculosis (TB) remains a global health challenge, exacerbated by the lack of effective diagnostics and vaccines.
  • The role of humoral immunity, particularly antibodies (Abs), in Mycobacterium tuberculosis (Mtb) infection is not well understood.
  • Distinguishing between latent TB infection (Ltb) and active TB disease (Atb) is critical for disease management.

Purpose of the Study:

  • To investigate the distinct Mtb-specific humoral immune responses in individuals with Ltb versus Atb.
  • To explore the functional characteristics of antibodies in different TB infection states.
  • To identify potential antibody-mediated mechanisms involved in controlling Mtb.

Main Methods:

  • Unbiased antibody profiling was employed to analyze Mtb-specific antibody responses.
  • FcγRIII binding, antibody glycosylation patterns, and Fc effector functions were assessed.
  • Macrophage-mediated killing of intracellular Mtb was evaluated in the presence of antibodies from Ltb and Atb individuals.

Main Results:

  • Distinct Mtb-specific antibody profiles were observed between Ltb and Atb.
  • Antibodies from Ltb individuals exhibited unique Fc functional profiles and selective FcγRIII binding.
  • Differential antibody glycosylation patterns were identified between Ltb and Atb.
  • Antibodies from Ltb enhanced phagolysosomal maturation, inflammasome activation, and macrophage-mediated killing of intracellular Mtb compared to those from Atb.

Conclusions:

  • Humoral immune responses, specifically Fc-mediated antibody effector functions, differ significantly between latent and active tuberculosis.
  • Antibody glycosylation patterns appear to modulate these Fc-mediated functions.
  • These findings suggest a potential role for Fc-mediated antibody effector functions in controlling Mtb infection, offering new avenues for therapeutic strategies.