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Complement factor H

The complement system is a crucial component of the innate immunity against microbial infection. Complement factor H, a 155 kDaplasma glycoprotein, is an essential regulatory protein that plays a critical role in the homeostasis of the complement system in plasma and in the protection of bystander host cells and tissues from damage by complement activation. Factor H binds to C3b, accelerates the decay of the alternative pathway C3-convertase and acts as a cofactor for the factor Imediated proteolyticinac­tivation of C3b. In addition, factor H has multiple physiological activities acts as an extracellularmatrix component, binds to cellular receptors of the integrintype, and interacts with a wide selection of ligands, such as the C-reactive protein, thrombospondin, bone sialoprotein, osteopontin, and heparin. Complement factor H has revealed an association with two different renal diseases, glomerulonephri­tisand atypical hemolytic uremicsyndrome (aHUS).

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