Immune system proteins

Immune system proteins represent a vast and heterogeneous class of molecules that orchestrate the body's defense mechanisms and maintain physiological homeostasis (StatPearls, 2023). This category encompasses diverse functional groups, including immunoglobulins (antibodies), cytokines, chemokines, complement factors, and cell-surface receptors such as the T-cell receptor (TCR) and Major Histocompatibility Complex (MHC) molecules (UniProt, 2024). These proteins facilitate complex signaling networks that regulate immune cell activation, migration, and effector functions to eliminate foreign pathogens or malignant cells (PubMed, 2021). Because the term refers to a broad functional category rather than a single molecular entity, it is not considered a specific therapeutic target in drug discovery (NIH, 2023). However, individual proteins within this group, such as Tumor Necrosis Factor (TNF) or Programmed Cell Death Protein 1 (PD-1), are among the most successful and widely utilized targets for treating inflammatory, autoimmune, and oncological diseases (Nature Reviews Drug Discovery, 2022). Due to the breadth of this classification, it is typically subdivided into specific families for drug development and clinical diagnostic purposes (Frontiers in Pharmacology, 2021).

Other names

ImmunoproteinsImmune proteinsImmune system componentsImmune-related proteinsHost defense proteins

Varies widely by specific protein; includes neutralization of soluble cytokines, blockade of checkpoint receptors, depletion of specific immune cell subsets, and modulation of intracellular signaling pathways.