Ligand-gated ion channels influencing Ca2+ flux (CP-LGICs)

Ligand-gated ion channels (LGICs) influencing calcium (Ca2+) flux constitute a diverse functional class of transmembrane proteins that open to allow the passage of cations, including Ca2+, upon the binding of specific chemical ligands (Traynelis et al., 2010, Pharmacological Reviews). This category encompasses several critical receptor families, most notably the N-methyl-D-aspartate (NMDA) glutamate receptors, certain nicotinic acetylcholine receptors (nAChRs) such as the alpha-7 subtype, and P2X purinergic receptors (Fucile, 2004, Critical Reviews in Neurobiology; North, 2002, Physiological Reviews). The influx of calcium through these channels serves as a vital signal for numerous intracellular processes, including the regulation of synaptic plasticity, gene expression, and the activation of various calcium-dependent enzymes (Paoletti et al., 2013, Nature Reviews Neuroscience). Because calcium is a potent signaling molecule, its dysregulation via these channels is a central mechanism in excitotoxicity and is heavily implicated in the pathogenesis of neurodegenerative conditions like Alzheimer's disease, as well as chronic pain, epilepsy, and psychiatric disorders (Dong et al., 2009, Acta Pharmacologica Sinica). Consequently, these channels are major therapeutic targets; for instance, memantine is used to mitigate NMDA-mediated excitotoxicity in dementia, while varenicline targets nAChRs for smoking cessation (Parsons et al., 2007, Neuropharmacology). This entry describes a broad functional grouping rather than a single molecular entity.

Other names

Calcium-permeable ligand-gated ion channelsIonotropic receptorsLigand-activated calcium channelsCP-LGICs

Drugs targeting these channels typically act as uncompetitive pore blockers, competitive antagonists, or allosteric modulators to regulate the duration and magnitude of ion conductance and subsequent calcium-dependent signaling pathways.