Complement H, also known as C3dg, is a component of the complement system, which is an important part of the immune system responsible for defending the body against infections and diseases. Complement H is a regulatory protein involved in the inhibition of the alternative pathway of complement activation.
The complement system is made up of a series of proteins that work together to eliminate pathogens, promote inflammation, and enhance immune responses. Complement H plays a crucial role in regulating the complement cascade and preventing excessive activation of the complement system, which can lead to tissue damage and autoimmune disorders.
Complement H acts by binding to complement fragments C3b and C3d, which are generated during the activation of the complement system. By binding to these fragments, Complement H prevents the formation of the C3 convertase complex, which is essential for the amplification of the alternative pathway.
By inhibiting the alternative pathway, Complement H helps maintain homeostasis and prevents unnecessary inflammation and tissue damage. Additionally, Complement H also aids in the clearance of immune complexes from circulation and prevents their deposition in tissues.
Alterations or deficiencies in Complement H can lead to dysregulation of the complement system, resulting in conditions such as age-related macular degeneration, atypical hemolytic uremic syndrome, and other complement-related disorders.
In summary, Complement H is a regulatory protein that inhibits the alternative pathway of complement activation, preventing excessive inflammation and maintaining immune system balance.
