autoimmune

(adjective)

Autoimmunity is the failure of an organism in recognizing its own constituent parts as self, which allows an immune response against its own cells and tissues. Any disease that results from such an aberrant immune response is termed an autoimmune disease. Autoimmunity is often caused by a lack of germ development of a target body, and as such the immune response acts against its own cells and tissues.

Related Terms

  • immune
  • antigen

Examples of autoimmune in the following topics:

  • The Roles of Genetics and Gender in Autoimmune Disease

    • Autoimmune diseases are very often treated with steroids.
    • Autoimmunity should not be confused with alloimmunity.
    • While a high level of autoimmunity is unhealthy, a low level of autoimmunity may actually be beneficial.
    • A person's sex also seems to have some role in the development of autoimmunity, classifying most autoimmune diseases as sex-related diseases.
    • Define autoimmunity and explain how it gives rise to autoimmune disease
  • Cytotoxic Autoimmune Reactions

    • Autoimmune diseases are very often treated with steroids.
    • Autoimmunity should not be confused with alloimmunity.
    • A person's sex also seems to have some role in the development of autoimmunity, classifying most autoimmune diseases as sex-related diseases.
    • According to the American Autoimmune Related Diseases Association (AARDA), autoimmune diseases that develop in men tend to be more severe.
    • The reasons for the sex role in autoimmunity are unclear.
  • Autoimmune Diseases

    • Autoimmune diseases are an inappropriate immune response against tissues in the body.
    • Autoimmune diseases are commonly considered complex immune disorders.
    • This has led to a "common cause hypothesis" of autoimmune disorders.
    • However, defects of one or more of these genes do not cause an autoimmune disease, but only predispose a person for an autoimmune disease.
    • The factors that trigger an autoimmune disease are still unknown.
  • The Complement System and Heart Disease

    • In autoimmune heart diseases, the body's immune defense system mistakes its own cardiac antigens as foreign, and attacks them.
    • Autoimmune heart diseases result when the body's own immune defense system mistakes cardiac antigens as foreign, and attacks them, leading to inflammation of the heart as a whole, or in parts.
    • The most common form of autoimmune heart disease is rheumatic heart disease, or rheumatic fever.
    • A typical mechanism of autoimmunity is autoantibodies, or auto-toxic T-lymphocyte mediated tissue destruction.
    • Aetiologically, autoimmune heart disease is most commonly seen in children with a history of sore throat caused by a streptococcal infection.
  • Hypersensitivities

    • The types of hypersensitivities include immediate, delayed, and autoimmunity hypersensitivities.
    • Most types of autoimmunity involve the humoral immune response.
    • Autoimmunity can develop with time; its causes may be rooted in molecular mimicry.
    • These antibodies can damage heart muscle with autoimmune attacks, leading to rheumatic fever.
    • Distinguish between the disruptions to the immune system caused by allergies and autoimmunity
  • Cell-Mediated Autoimmune Reactions

    • Cell-mediated autoimmunity can happen by several mechanisms involving cells of the immune system and their receptors.
    • Several mechanisms are thought to be operative in the pathogenesis of autoimmune diseases, against a backdrop of genetic predisposition and environmental modulation.
    • When tolerance to self proteins is lost, DQ may become involved in autoimmune disease.
    • Two autoimmune diseases in which HLA-DQ is involved are celiac disease and diabetes mellitus type 1.
    • Define cell-mediated autoimmunity and describe the mechanisms that are thought to operate in the pathogenesis of autoimmune disease
  • Adrenal Gland Disorders

    • One subtype is called idiopathic or unknown cause of adrenal insufficiency. 80% are due to an autoimmune disease called Addison's disease or autoimmune adrenalitis.
    • For chronic adrenal insufficiency, the major contributors are autoimmune adrenalitis, tuberculosis, AIDS, and metastatic disease.
    • Autoimmune adrenalitis may be part of Type 2 autoimmune polyglandular syndrome, (which can include type 1 diabetes), hyperthyroidism, autoimmune thyroid disease (also known as autoimmune thyroiditis and Hashimoto's disease).
  • Systemic Lupus Erythematosus

    • Systemic lupus erythematosus (SLE) is an autoimmune disease that can occur in any organ or tissue in the body.
    • Systemic lupus erythematosus, often abbreviated to SLE or lupus, is a systemic autoimmune disease (or autoimmune connective tissue disease) that can affect any part of the body.
    • As with other autoimmune diseases, the immune system attacks the body's own cells and tissue, resulting in inflammation and tissue damage.
    • It is the prototypical autoimmune disease.
  • Hypersensitivity

    • A hypersensitivity reaction refers to an overreactive immune system triggered by allergies and autoimmunity.
    • Hypersensitivity (also called hypersensitivity reaction) refers to undesirable reactions produced by the normal immune system, including allergies and autoimmunity, and are commonly mediated by antibodies.
    • Associated disorders: Autoimmune hemolytic anemia, thrombocytopenia, Erythroblastosis, fetalis, Goodpasture's syndrome, Membranous nephropathy, Graves' disease, Myasthenia Gravis.
  • Maturation of T Cells

    • This process does not remove thymocytes that may become sensitized against self-antigens, which causes autoimmunity.
    • The potentially autoimmune cells are removed by the process of negative selection.
    • Autoimmune diseases reflect a loss of central tolerance, in which the body's own B and T cells become sensitized towards self antigens.
    • Many autoimmune disorders are humoral in that they are primarily antibody mediated, but many disorders are T cell mediated instead, such as Chrohn's disease (a disease in which T cells attack the colon).
    • These autoimmune disorders may be due to problems in negative selection, and tend to have genetic components as well.
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