Antigen Depot

“Antigen depot” refers to a conceptual and functional mechanism by which certain vaccine **adjuvants** (such as alum or oil-based adjuvants) create a persistent local reservoir of antigen at the site of injection, resulting in *slow and sustained antigen release and presentation* to the immune system[1][3][5][6][7]. The depot effect was historically believed to be a principal mechanism of action for many adjuvants, purportedly leading to enhanced antibody responses by keeping antigens available for antigen-presenting cells (APCs) over an extended period. However, more recent evidence suggests that while depot formation may contribute to immune responses, **it is neither always required nor sufficient for adjuvant-induced immunogenicity**, and other mechanisms (such as direct innate immune activation) are also critical[3][6][7]. “Antigen depot” is not a therapeutic target, molecule, or structural receptor. If you are seeking information on a particular protein, receptor, or cellular target, a more specific name will be needed.

Other names

antigen depotsdepot effect

Slow release of antigen at injection site; Increased antigen uptake by antigen-presenting cells (APCs); Prolonged immune system stimulation