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Chapter 23: Problem 10

Immunological tolerance to "self" is established by: A. destruction of self-reactive lymphoid cells. B. clonal anergy. C. clonal deletion. D. All of these are correct.

Short Answer

Expert verified
D. All of these are correct.

Step by step solution

01

Understanding Immunological Tolerance

Immunological tolerance is a process by which the immune system does not attack the body's own cells, tissues, and proteins. This is crucial to prevent autoimmune diseases. Tolerance can be established through several mechanisms that ensure self-reactivity is minimized.
02

Analyzing Destruction of Self-Reactive Lymphoid Cells

The immune system sometimes generates lymphoid cells that can react to the body's own tissues. One way to handle these cells is through destruction, which occurs in the thymus for T cells & bone marrow for B cells, known as 'central tolerance.'
03

Exploring Clonal Anergy

Clonal anergy is a state where self-reactive immune cells are inactivated. These cells are alive but rendered non-functional because they are deprived of necessary second signals that are essential for activation, thus preventing them from causing harm.
04

Understanding Clonal Deletion

Clonal deletion is another central tolerance mechanism where self-reactive lymphocytes are eliminated during their development鈥攑rimarily in the thymus for T cells or bone marrow for B cells鈥攖hereby preventing them from reaching full maturation and attacking "self" tissues.
05

Evaluating Option D

Option D states that all the mechanisms listed (destruction of self-reactive cells, clonal anergy, and clonal deletion) are correct ways by which immunological tolerance is established. Since all have legitimate roles, option D includes all proper methods of establishing tolerance.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Clonal Anergy
When the body encounters self-reactive immune cells, it uses several strategies to prevent potential harm. One such strategy is **clonal anergy**. This is a state of dormancy where immune cells are kept alive but non-functional. Clonal anergy is primarily employed when immune cells attempt to attack the body鈥檚 own tissues.

Imagine our immune system as a security team. Sometimes, a team member mistakenly identifies a harmless object as a potential threat. Instead of firing the team member, they are reassigned to a watch-only duty. That鈥檚 similar to clonal anergy: the self-reactive immune cells are alive and in the system but cannot perform their functions.
  • Anergic cells don't get the necessary 'second signal' for activation.
  • These cells get deactivated but can be reactivated under different, more controlled circumstances.
  • The process ensures no unnecessary reaction occurs, which could lead to autoimmune disorders.
Clonal Deletion
A fundamental method your body uses to eliminate threats is through **clonal deletion**. Unlike anergy, where cells are alive but inactive, clonal deletion completely removes them from the system.

During the early stages of immune cell development, cells move through various tests in primary lymphoid organs like the thymus for T cells and the bone marrow for B cells. Those that react to self-antigens are identified and deleted to prevent autoimmunity.
  • Clonal deletion mainly occurs during the developmental phase of immune cells.
  • This method is a primary mechanism of 'central tolerance.'
  • Ensures that mature immune cells do not target the body's own tissues.
Central Tolerance
**Central tolerance** is a crucial mechanism that occurs in the primary lymphoid organs鈥攏amely, the thymus for T cells and the bone marrow for B cells. This process is at the heart of ensuring that self-reactive lymphoid cells are either eliminated or functionally neutralized before they mature and enter the body's bloodstream.

The goal of central tolerance is to prevent autoimmunity by removing or inactivating cells that recognize and could potentially attack self-antigens.
  • Central tolerance includes mechanisms like clonal deletion and clonal anergy.
  • It ensures that only non-self-reactive cells migrate into the bloodstream to perform immune functions.
  • It acts as a "quality control" phase before full immune cell maturation.
This is why central tolerance is often referred to as the body's first line of defense against autoimmunity.

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