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Scheme of the complement system. The complement system, also known as complement cascade, is a part of the humoral, innate immune system and enhances (complements) the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism, promote inflammation, and attack the pathogen's cell membrane. [1]
Deposited complexes then initiate a local inflammatory reaction, which causes damage through the activation of the complement system, which, after a huge cascade of enzyme activation, leaves cell membranes with channels that let fluid and molecules go in and out all willy nilly, causing the cell to burst and die, usually though you’d want ...
[1] [4] [5] The complement system activation may be due to mutations in the complement regulatory proteins (factor H, factor I, or membrane cofactor protein (CD46)), [6] [5] [7] or occasionally due to acquired neutralizing autoantibody inhibitors of these complement system components (e.g. anti–factor H antibodies).
The alternative pathway is a type of cascade reaction of the complement system and is a component of the innate immune system, a natural defense against infections. The alternative pathway is one of three complement pathways that opsonize and kill pathogens. The pathway is triggered when the C3b protein directly binds a microbe. It can also be ...
Complement component 3, often simply called C3, is a protein of the immune system that is found primarily in the blood. It plays a central role in the complement system of vertebrate animals and contributes to innate immunity. In humans it is encoded on chromosome 19 by a gene called C3. [5] [6]
The classical complement pathway is one of three pathways which activate the complement system, which is part of the immune system. The classical complement pathway is initiated by antigen-antibody complexes with the antibody isotypes IgG and IgM .
Complement component 3 (C3) is a protein involved in both the innate and adaptive immune response. C3 is one of over 30 complement proteins circulating in the blood. [3] C3 circulates in an inactive form but can be activated in order to aid the immune system's response to a foreign invader. [4]
Complement deficiency is an immunodeficiency of absent or suboptimal functioning of one of the complement system proteins. [4] Because of redundancies in the immune system, many complement disorders are never diagnosed. Some studies estimate that less than 10% are identified. [5]
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