Autoimmunity
Disorders where the immune system attacks self-cells and tissues, mistaking them for foreign invaders.
What is Autoimmunity?
A condition in which the immune system mistakenly attacks the body's own healthy cells and tissues.
Key points
- Define autoimmunity and explain its underlying mechanism.
- Differentiate between organ-specific and systemic autoimmune diseases.
- List common examples of autoimmune diseases.
- Discuss the factors contributing to the development of autoimmune diseases.
Common exam trap
Confusing autoimmunity with immunodeficiency (where the immune system is weak).
Definitions
- Term
Autoimmunity
- Meaning
A condition in which the immune system mistakenly attacks the body's own healthy cells and tissues.
- Term
Self-tolerance
- Meaning
The ability of the immune system to recognize and not react against the body's own antigens.
- Term
Autoantibody
- Meaning
An antibody produced by the immune system that targets the body's own proteins or tissues.
- Term
Molecular Mimicry
- Meaning
A mechanism by which foreign antigens share sequence or structural similarities with self-antigens, potentially triggering an autoimmune response.
- Term
Organ-specific autoimmune disease
- Meaning
An autoimmune disease where the immune response is directed against antigens found in only one organ or tissue.
- Term
Systemic autoimmune disease
- Meaning
An autoimmune disease where the immune response is directed against antigens found in multiple organs or tissues throughout the body.
Learning objectives
Define autoimmunity and explain its underlying mechanism.
Differentiate between organ-specific and systemic autoimmune diseases.
List common examples of autoimmune diseases.
Discuss the factors contributing to the development of autoimmune diseases.
Explain the concept of self-tolerance and its failure in autoimmunity.
Prerequisites
Basic understanding of the immune system (innate and adaptive immunity).
Knowledge of different types of immune cells (lymphocytes, phagocytes).
Understanding of antigens and antibodies.
Concept of self-tolerance.
Basic knowledge of human anatomy and physiology.
Common mistakes
Confusing autoimmunity with immunodeficiency (where the immune system is weak).
Believing all autoimmune diseases have the same symptoms or treatments.
Not understanding the role of both genetic and environmental factors.
Misinterpreting "self" and "non-self" recognition.
Keywords
Autoimmunity
Self-tolerance
Autoantibodies
Immune system
Genetic predisposition
Environmental triggers
Organ-specific
Systemic
Rheumatoid Arthritis
Type 1 Diabetes
Lupus
Hashimoto's Thyroiditis
Multiple Sclerosis
Immunosuppression
Practice preview
Which of the following is an example of an autoimmune disease?…
easy
In autoimmune diseases, the immune system mistakenly attacks:…
easy
Which of the following is NOT a common characteristic of autoimmune diseases?…
easy