Immune receptor

Immune receptors are a diverse class of proteins expressed on the surface or within the cytoplasm of immune cells that recognize specific ligands to initiate or modulate immune responses (Wikipedia, 2024). They are broadly categorized into innate immune receptors, such as pattern recognition receptors (PRRs) like Toll-like receptors (TLRs) and NOD-like receptors (NLRs), and adaptive immune receptors, including T-cell receptors (TCRs) and B-cell receptors (BCRs) (NIH, 2021). These receptors detect pathogen-associated molecular patterns (PAMPs), damage-associated molecular patterns (DAMPs), or specific antigens, triggering signaling cascades that lead to cytokine production, cell proliferation, and pathogen clearance (StatPearls, 2023). In disease, dysregulation of immune receptor signaling can lead to chronic inflammation, autoimmunity, or the failure of the immune system to eliminate cancer cells (PubMed, 2022). Consequently, immune receptors are major therapeutic targets; drugs like checkpoint inhibitors (e.g., anti-PD-1) and cytokine receptor antagonists (e.g., anti-IL-6R) are widely used to treat malignancies and inflammatory disorders (Nature Reviews Drug Discovery, 2020). Because the term "Immune receptors" refers to a broad functional class of proteins rather than a single molecular entity, therapeutic interventions are typically designed to target specific members of this family depending on the clinical indication.

Other names

Pattern recognition receptorPRRAntigen receptorImmunoreceptorCytokine receptorLymphocyte receptor

Immune receptors are modulated through several mechanisms: checkpoint inhibition (blocking inhibitory receptors like PD-1 to enhance T-cell activity), receptor antagonism (blocking cytokine receptors like IL-6R to reduce inflammation), and agonism (activating receptors like TLR7 to stimulate innate immunity) (Nature Reviews Drug Discovery, 2020; NIH, 2021).