Volume-sensitive outwardly rectifying chloride channel (VSORC)

The Volume-sensitive outwardly rectifying chloride channel (VSORC), also known as the Volume-regulated anion channel (VRAC), is a ubiquitously expressed membrane protein complex essential for cellular volume homeostasis (Voss et al., 2014). It is primarily composed of the Leucine-rich repeat-containing protein 8A (LRRC8A) subunit, which forms heterohexamers with other LRRC8 family members to facilitate the efflux of chloride ions and organic osmolytes like taurine and glutamate in response to osmotic swelling (Qiu et al., 2014). Beyond its role in regulatory volume decrease, VSORC is a critical mediator of apoptotic volume decrease (AVD), a hallmark of programmed cell death (Planells-Cases et al., 2015). In clinical contexts, VSORC is implicated in cancer multidrug resistance, particularly to platinum-based agents, and plays a significant role in the pathophysiology of ischemic stroke by contributing to excitotoxic glutamate release (Zhang et al., 2008). While pharmacological inhibitors like DCPIB show promise in preclinical models for neuroprotection and oncology, the channel's broad physiological distribution and its requirement for normal immune system development present significant challenges for targeted drug design (Osei-Owusu et al., 2018).

Other names

Volume-regulated anion channelVRACVolume-sensitive outwardly rectifying anion channelVSORLRRC8ASWELL1

Inhibition of chloride and organic osmolyte efflux through the LRRC8 hexameric complex to modulate cell volume and signaling.