Volume-regulated anion channel subunit LRRC8A (LRRC8A)

Volume-regulated anion channel subunit LRRC8A (LRRC8A or SWELL1) is the essential pore-forming subunit of the volume-regulated anion channel (VRAC), an ion channel complex activated by cell swelling to mediate efflux of chloride ions and organic osmolytes for restoration of cell volume. LRRC8A belongs to a family of five leucine-rich repeat-containing proteins (LRRC8A–E); functional channels are heteromeric assemblies requiring LRRC8A, typically forming hexameric structures in the membrane. Structurally, LRRC8A contains extracellular, transmembrane, intracellular, and leucine-rich repeat domains that together create a channel selective for anions. VRAC channels participate in cell volume regulation, neurotransmitter release (notably glutamate from astrocytes), and various disease-relevant processes including cancer progression, neuronal excitotoxicity, and cardiovascular pathophysiology. The channel possesses distinct pharmacology, with DCPIB as the most selective inhibitor in research. Therapeutic targeting remains experimental due to the ubiquitous and vital function of LRRC8A, and safety profiles are not established beyond preclinical data[1][2][3].

Other names

SWELL1Leucine-rich repeat-containing protein 8AVolume-regulated anion channel subunit LRRC8AAGM5KIAA1437LRRC8UNQ221/PRO247HsLRRC8AFLJ10337Swelling protein 1

Potent inhibition of VRAC-mediated current by DCPIB; DCPIB blocks the pore, leading to inhibition of anion flux Allosteric modulation by synthetic nanobodies (“sybodies”) that bind to cytoplasmic domains, either inhibiting (Sb1-3) or potentiating (Sb4-5) channel activity