Differentiate the three types of autoimmune diseases. Name an example of each type.

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Understand that autoimmune diseases are classified based on the mechanism of immune response and the location of tissue damage. The three main types are Type I, Type II, and Type III hypersensitivity reactions, each associated with different autoimmune disease mechanisms.

Type I autoimmune diseases involve immediate hypersensitivity reactions mediated by IgE antibodies. These are less common in autoimmunity but are characterized by allergic-type responses. An example is not typically classified under classic autoimmune diseases, so focus more on Types II and III for autoimmunity.

Type II autoimmune diseases are antibody-mediated cytotoxic reactions where autoantibodies target antigens on cell surfaces or extracellular matrix, leading to cell destruction or dysfunction. An example is Graves' disease, where autoantibodies stimulate the thyroid gland.

Type III autoimmune diseases involve immune complex-mediated hypersensitivity. Here, antigen-antibody complexes deposit in tissues, causing inflammation and damage. An example is systemic lupus erythematosus (SLE), where immune complexes deposit in various organs.

Additionally, Type IV autoimmune diseases are cell-mediated (delayed-type hypersensitivity) involving T cells attacking tissues. An example is Type 1 diabetes mellitus, where T cells destroy pancreatic beta cells. Although not asked explicitly, recognizing this type completes the understanding of autoimmune classifications.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Types of Autoimmune Diseases

Autoimmune diseases are classified into three main types: organ-specific, systemic, and mixed. Organ-specific diseases target a single organ or tissue, systemic diseases affect multiple organs or systems, and mixed types show features of both. Understanding these categories helps in diagnosis and treatment.

Organ-Specific Autoimmune Diseases

Organ-specific autoimmune diseases involve immune attacks on a particular organ, leading to localized damage. Examples include Type 1 diabetes, where the pancreas is targeted, and Hashimoto's thyroiditis, affecting the thyroid gland. Symptoms and treatment depend on the affected organ.

Systemic Autoimmune Diseases

Systemic autoimmune diseases affect multiple organs or tissues throughout the body, causing widespread inflammation and damage. Examples include systemic lupus erythematosus (SLE), which can impact skin, joints, kidneys, and more. These diseases often require broad immunosuppressive therapies.

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