Purinergic receptor P2X family member (P2X receptor)

The Purinergic receptor P2X family consists of ATP-gated, ligand-activated, nonselective cation channels that function as trimeric complexes, formed by seven genes in vertebrates (P2X1–P2X7). Upon binding extracellular ATP, these receptors enable the rapid influx of Na⁺, Ca²⁺, and K⁺, generating cellular depolarization and ion signaling events. They play key roles in neuronal signaling, muscle contraction, inflammation, immunity, and cell death. Each subunit features two transmembrane domains and a large extracellular ATP-binding domain, assembling as homotrimers or heterotrimers, with subtype-specific pharmacology and physiology. The P2X family is therapeutically relevant for modulating pain, inflammatory diseases, neurodegeneration, and immune responses. Therapeutic challenge arises from limited subtype selectivity and complex functional roles in diverse tissues. “Purinergic receptor P2X family member” is a collective name; drug discovery and biomedical studies often focus on individual subunits such as P2X3 or P2X7.

Other names

P2X receptorP2X purinoceptorP2XRATP-gated ion channelP2X1P2X2P2X3P2X4P2X5P2X6P2X7

Antagonism: Blocks ATP binding or channel opening to inhibit downstream signaling (main mode of action for current therapeutic agents) Agonism: Less common, promotes receptor activation and downstream signaling (rarely targeted clinically)