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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...

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Related Experiment Video

Updated: May 8, 2026

Examination of Thymic Positive and Negative Selection by Flow Cytometry
14:29

Examination of Thymic Positive and Negative Selection by Flow Cytometry

Published on: October 8, 2012

Negative selection of lymphocytes

G J Nossal1

  • 1Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Victoria, Australia.

Cell
|January 28, 1994
PubMed
Summary
This summary is machine-generated.

Negative selection of T and B lymphocytes is not absolute, allowing for a balance between removing self-reactive cells and preserving useful immune responses. This process influences the development of adaptive immunity through various cellular and environmental factors.

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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • Negative selection of T and B lymphocytes is crucial for preventing autoimmunity but cannot be absolute due to stochastic receptor generation.
  • The immune system must balance the removal of self-reactive cells with the preservation of a diverse repertoire capable of recognizing foreign antigens.

Purpose of the Study:

  • To review the factors influencing T and B cell repertoire development, focusing on the mechanisms of negative selection and clonal expansion.
  • To explore how immature and mature lymphocytes differ in their susceptibility to deletion or anergy.
  • To discuss the role of signaling strength and cellular context in determining lymphocyte fate.

Main Methods:

  • This review synthesizes existing literature on lymphocyte selection processes.
  • It analyzes the impact of primary and secondary lymphoid organ environments on immune cell development.
  • It discusses the ontogeny of lymphocyte receptor signaling and its role in selection.

Main Results:

  • Negative selection is a relative process, influenced by receptor affinity, antigen accessibility, and presentation.
  • Immature lymphocytes are more susceptible to deletion or anergy, with signaling strength dictating the outcome (strong signal for deletion, weaker for anergy).
  • Factors like geography and ontogeny modulate the balance between negative and positive selection, shaping the adaptive immune repertoire.

Conclusions:

  • The development of a functional lymphocyte repertoire involves a dynamic interplay of negative and positive selection mechanisms.
  • While dangerous self-reactive cells are eliminated, a degree of self-reactivity is tolerated, contributing to immune homeostasis.
  • Understanding these selection processes is key to comprehending adaptive immunity and developing strategies for immune-related disorders.