IgA antibodies play a crucial role in the mucosal immunity. They are instrumental in protecting the body from infections at mucosal surfaces, which are common entry points for pathogens. By binding to pathogens, IgA prevents them from adhering to and penetrating the epithelial cells, thus inhibiting infection. Additionally, IgA can activate other components of the immune system, such as complement proteins and phagocytic cells, to clear pathogens more effectively.
