Antigens and immune system components

Antigens and immune system components refers to a broad biological category rather than a single molecular entity. Antigens are molecules, often proteins or polysaccharides, that can be recognized by the adaptive immune system, specifically by B-cell or T-cell receptors [Janeway's Immunobiology, 2016]. The components of the immune system include a diverse set of proteins such as cytokines, chemokines, complement factors, and various cell-surface receptors that coordinate the body's defense against pathogens and internal threats like cancer [NIH NIAID, 2023]. In clinical practice, specific molecules within this category are targeted by a wide range of drugs; for example, TNF-alpha inhibitors are used for rheumatoid arthritis, and immune checkpoint inhibitors target PD-1/PD-L1 for oncology [Nature Reviews Drug Discovery, 2020]. Because this term encompasses thousands of distinct proteins with varying functions, it is considered a high-level classification rather than a specific, actionable therapeutic target [UniProt, 2024]. Therapeutic intervention within this category varies widely, ranging from immunosuppression in organ transplantation to immunostimulation in oncology [NIH, 2023].

Other names

Immune system proteinsImmunological factorsAntigens

Various mechanisms including cytokine neutralization, checkpoint inhibition, and immunosuppression depending on the specific component targeted.