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<p><b>New page</b></p><div>'''Autoantibody'''<br />
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An '''autoantibody''' is an [[antibody]] (a type of [[protein]]) produced by the [[immune system]] that is directed against one or more of the individual's own [[proteins]]. This is in contrast to a normal antibody, which targets foreign substances, such as [[bacteria]] and [[viruses]]. Autoantibodies can be involved in the development of [[autoimmune diseases]], where the immune system mistakenly attacks the body's own tissues.<br />
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==Formation and Function==<br />
Autoantibodies are typically produced by [[B cells]] and can arise due to a variety of factors, including genetic predisposition, environmental triggers, and infections. The exact mechanism by which autoantibodies contribute to disease is complex and can involve multiple pathways, including the direct binding to and destruction of target tissues, the formation of immune complexes, and the activation of inflammatory pathways.<br />
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==Types of Autoantibodies==<br />
There are many different types of autoantibodies, each associated with specific [[autoimmune diseases]]. Some of the most well-known autoantibodies include:<br />
* [[Antinuclear antibodies]] (ANA) - commonly associated with [[systemic lupus erythematosus]] (SLE)<br />
* [[Rheumatoid factor]] (RF) - associated with [[rheumatoid arthritis]]<br />
* [[Anti-citrullinated protein antibodies]] (ACPA) - also associated with rheumatoid arthritis<br />
* [[Anti-thyroid antibodies]] - associated with [[Hashimoto's thyroiditis]] and [[Graves' disease]]<br />
* [[Anti-glomerular basement membrane antibodies]] - associated with [[Goodpasture's syndrome]]<br />
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==Role in Autoimmune Diseases==<br />
Autoantibodies play a crucial role in the pathogenesis of many autoimmune diseases. For example, in [[systemic lupus erythematosus]], autoantibodies target nuclear components, leading to widespread inflammation and tissue damage. In [[rheumatoid arthritis]], autoantibodies target joint tissues, causing chronic inflammation and joint destruction.<br />
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==Diagnosis==<br />
The presence of autoantibodies can be detected through various laboratory tests, which are often used to diagnose autoimmune diseases. Common tests include:<br />
* [[Enzyme-linked immunosorbent assay]] (ELISA)<br />
* [[Indirect immunofluorescence]]<br />
* [[Western blot]]<br />
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==Treatment==<br />
Treatment of conditions involving autoantibodies typically focuses on reducing immune system activity and managing symptoms. This can include the use of:<br />
* [[Immunosuppressive drugs]]<br />
* [[Corticosteroids]]<br />
* [[Biologic agents]] that target specific components of the immune system<br />
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==See Also==<br />
* [[Autoimmunity]]<br />
* [[Immune system]]<br />
* [[Antibody]]<br />
* [[B cell]]<br />
* [[Systemic lupus erythematosus]]<br />
* [[Rheumatoid arthritis]]<br />
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==Related Pages==<br />
* [[Antinuclear antibodies]]<br />
* [[Rheumatoid factor]]<br />
* [[Hashimoto's thyroiditis]]<br />
* [[Graves' disease]]<br />
* [[Goodpasture's syndrome]]<br />
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[[Category:Immunology]]<br />
[[Category:Autoimmune diseases]]<br />
[[Category:Antibodies]]<br />
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