Immune complex
Immune Complex[edit]
An immune complex is a molecule formed from the binding of multiple antibodies to antigens. These complexes play a crucial role in the immune system by facilitating the removal of antigens from the body. However, they can also contribute to the pathogenesis of various immune complex diseases.
Formation[edit]
Immune complexes are formed when antibodies, which are proteins produced by B cells, bind to specific antigens. This binding is a key part of the adaptive immune response, allowing the body to target and neutralize foreign pathogens such as bacteria and viruses.
Function[edit]
The primary function of immune complexes is to facilitate the clearance of antigens. Once formed, these complexes can activate the complement system, a group of proteins that assists in the destruction of pathogens. The complement system enhances the ability of phagocytes to engulf and destroy antigens, a process known as opsonization.
Pathological Effects[edit]
While immune complexes are essential for normal immune function, their accumulation can lead to immune complex-mediated diseases. These diseases occur when immune complexes deposit in tissues, causing inflammation and tissue damage. Examples include:
Clearance[edit]
The body has mechanisms to clear immune complexes from the circulation. Macrophages and other phagocytic cells in the reticuloendothelial system play a significant role in this process. Additionally, the spleen and liver are involved in filtering and removing these complexes.
