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Special Features of Adaptive Immunity

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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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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Related Experiment Video

Updated: Jun 23, 2025

An Automated Culture System for Use in Preclinical Testing of Host-Directed Therapies for Tuberculosis

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Published on: August 16, 2021

Antigen specificity shapes antibody functions in tuberculosis.

Joshua R Miles¹, Pei Lu², Shuangyi Bai³

¹UT Southwestern Medical Center, Department of Immunology.

Biorxiv : the Preprint Server for Biology

|June 19, 2024

Summary

Antibody function in tuberculosis (TB) depends on antigen specificity. Targeting specific Mycobacterium tuberculosis (Mtb) proteins can either enhance or inhibit disease, revealing dual roles for antibodies in TB immunity.

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Area of Science:

Immunology
Infectious Diseases
Microbiology

Background:

Tuberculosis (TB) remains a leading infectious cause of death globally, underscoring gaps in understanding immune responses.
Antibody Fc-mediated functions are recognized as immune correlates, but their precise impact on Mycobacterium tuberculosis (Mtb) is not fully elucidated.

Purpose of the Study:

To investigate how antigen specificity, dictated by the antibody Fab domain, influences Fc effector functions against Mtb.
To explore the dual roles of antibodies in TB pathogenesis and protection.

Main Methods:

Analysis of antibody subclass, glycosylation, and Fc effector functions in TB patients targeting Mtb cell wall and ESAT-6 & CFP-10 proteins.
Generation and testing of a human monoclonal IgG1 targeting ESAT-6 & CFP-10.

Main Results:

Antigen specificity significantly alters antibody subclass, post-translational glycosylation, and Fc effector functions in TB patients.
Mtb cell wall-specific IgG3 was found to enhance disease via opsonophagocytosis of extracellular Mtb.
Antibodies targeting ESAT-6 & CFP-10, including a novel IgG1, demonstrated inhibition of intracellular Mtb.

Conclusions:

Antibodies play multifaceted roles in tuberculosis immunity.
Antigen specificity is a crucial determinant of whether antibodies exert protective or pathogenic effects against Mtb.