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AUTOIMMUNE DISEASES - AUTOIMMUNE DISEASES , ....

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AUTOIMMUNE DISEASES   In spite of nature’s ways of preventing it, it is possible for one’s own immune system to lose the  ability to distinguish self or to choose not to respond to self. The result is an attack on a tissue or  tissues of the body.    1. Type I Autoimmunity--antibodies made in response to a virus find proteins on body cells that  also react with the antibodies. Cells are destroyed.    2. Type II (Cytotoxic) autoimmune reactions involve production of antibodies which react to cell- surface antigens. Cells are not destroyed but other harmful effects occur. Myasthenia gravis and  Grave’s disease are examples.   3. Type III ( Immune complex)  autoimmune reactions involve the deposition of immune  complexes (antigen-antibody complexes) which result in tissue damage. Examples are lupus and  rheumatoid arthritis.    4. Type IV (Cell-mediated) autoimmune reactions involve attack by cytolytic T cells. Examples 
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