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A minimal model for the self-nonself discrimination: a return to the basics
1Conceptual Immunology Group, The Salk Institute for Biological Studies, La Jolla, CA 92117, USA. langman@salk.edu
Seminars in Immunology
|July 27, 2000
Summary
The immune system requires self-nonself discrimination early in development. A proposed mechanism explains how T and B cells differentiate to distinguish self from nonself, preventing autoimmune responses.
Area of Science:
- Immunology
- Developmental Biology
- Evolutionary Biology
Background:
- Host organisms require adaptive immune systems to combat pathogens, especially when host evolution lags behind pathogen evolution.
- Immune systems must possess the ability to generate and regulate novel specificities somatically.
- Effective self-nonself discrimination is crucial for preventing autoimmune diseases.
Purpose of the Study:
- To propose a novel mechanism for self-nonself discrimination in the immune system.
- To elucidate the developmental processes underlying immune cell differentiation and regulation.
- To explain how the immune system avoids attacking self-antigens.
Main Methods:
- Theoretical modeling of immune cell differentiation pathways.
- Analysis of T cell (Th) and B cell development.
- Hypothesizing regulatory events during early host development.
Main Results:
- All T and B cells originate in an inactive (i-state) incapable of effector functions.
- Prolonged absence of antigen exposure allows helper T cells (iTh) to differentiate into effector helper T cells (eTh).
- Antigen exposure in i-state cells induces an anticipatory (a-state); with eTh, this leads to the effector (e-state); without eTh, it causes cell death.
Conclusions:
- Self-nonself discrimination is a one-time regulatory event occurring early in development under maternal protection.
- The proposed mechanism explains how immune cells differentiate to recognize and respond to nonself antigens while tolerating self-antigens.
- This developmental process is essential for establishing immune tolerance and preventing autoimmunity.
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