Cytosolic pattern recognition receptor (PRR)

Cytosolic pattern recognition receptors are a **category of intracellular receptors** that recognize pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs) within the cytoplasm, triggering innate immune responses[2][3][4][6]. Unlike membrane-bound receptors such as Toll-like receptors, cytosolic PRRs include several major families: NOD-like receptors (NLRs), which detect bacterial components and can assemble inflammasomes; RIG-I-like receptors (RLRs), which sense viral RNA in the cytoplasm; AIM2-like receptors (ALRs), which detect cytosolic DNA; and cGAS, which catalyzes the production of cyclic GMP-AMP in response to cytosolic DNA, triggering STING-mediated interferon production[3][4]. Activation of these receptors leads to pro-inflammatory signaling, induction of cell death pathways, or production of antiviral cytokines. Dysregulation of cytosolic PRR pathways is implicated in infections, inflammatory diseases, cancers, and autoimmune conditions[5][4]. The diversity and essential role of cytosolic PRRs make them promising but complex therapeutic targets; their broad category nature means that any therapeutic intervention must be specific to the individual receptor subtype to avoid unwanted immune activation or suppression[3][4][5].

Other names

Cytosolic PRRCytoplasmic PRRNOD-like receptor (NLR) (subcategory)RIG-I-like receptor (RLR) (subcategory)cGAS (cyclic GMP-AMP synthase) (subcategory)AIM2-like receptor (ALR) (subcategory)

Modulation of immune activation (e.g., dampening or stimulating PRR signaling pathways) Inhibition of inflammasome activation (e.g., NLRP3 inhibitors) Stimulation of interferon response (e.g., RIG-I agonists, cGAS-STING agonists)