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Although complement is intended to protect the body systems, under stress there can be more damage than protection. Research has suggested that the complement system is manipulated during HIV / AIDS , in a way that further damages the body.
[3] An example of complement dependent type II hypersensitivity is an acute hemolytic transfusion reaction following transfusion of ABO incompatible blood. [4] Preformed antibody (predominantly IgM) against donor red cell antigens not found in an individual of a particular blood group (e.g. anti-A IgM in an individual with blood group B), bind to the donor red cell surface and lead to rapid ...
[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).
Membrane attack complex (Terminal complement complex C5b-9) A membrane attack complex attached to a pathogenic cell The membrane attack complex (MAC) or terminal complement complex (TCC) is a complex of proteins typically formed on the surface of pathogen cell membranes as a result of the activation of the host's complement system, and as such is an effector of the immune system.
Among other things, your complement immune system cleans up damaged cells, helps your body heal after an injury or infection, and destroys microscopic organisms like bacteria that can make you ...
Type III hypersensitivity, in the Gell and Coombs classification of allergic reactions, occurs when there is accumulation of immune complexes (antigen-antibody complexes) that have not been adequately cleared by innate immune cells, giving rise to an inflammatory response and attraction of leukocytes.
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 deficiency is where the function of the complement system is deficient; In reality, immunodeficiency often affects multiple components, with notable examples including severe combined immunodeficiency (which is primary) and acquired immune deficiency syndrome (which is secondary).