Immune tolerance
Immune Tolerance[edit]
Immune tolerance is a state of unresponsiveness of the immune system to substances or tissues that have the potential to induce an immune response. It is a critical aspect of the immune system that prevents autoimmunity, allowing the body to tolerate self-antigens while remaining responsive to foreign antigens.
Mechanisms of Immune Tolerance[edit]
Immune tolerance can be broadly categorized into two types: central tolerance and peripheral tolerance.
Central Tolerance[edit]
Central tolerance occurs during the development of T cells and B cells in the thymus and bone marrow, respectively. During this process, cells that recognize self-antigens with high affinity are eliminated through a process known as negative selection. This ensures that the majority of self-reactive lymphocytes are removed before they can enter the circulation.
Peripheral Tolerance[edit]
Peripheral tolerance takes place after lymphocytes have matured and entered the peripheral tissues. It involves several mechanisms, including:
- Anergy: A state of functional inactivation that occurs when lymphocytes encounter antigens without the necessary co-stimulatory signals.
- Regulatory T cells (Tregs): A subset of T cells that suppress immune responses and maintain tolerance to self-antigens.
- Deletion: The induction of apoptosis in self-reactive lymphocytes that escape central tolerance.
Importance of Immune Tolerance[edit]
Immune tolerance is essential for preventing autoimmune diseases, where the immune system mistakenly attacks the body's own tissues. It also plays a crucial role in transplantation, where tolerance to donor antigens can prevent graft rejection.
Clinical Implications[edit]
Failures in immune tolerance can lead to a variety of autoimmune diseases, such as type 1 diabetes, rheumatoid arthritis, and multiple sclerosis. Understanding the mechanisms of immune tolerance is vital for developing therapies to treat these conditions.
Related Pages[edit]
| Immunology | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
This immunology-related article is a stub.
|
