Chloride voltage-gated channel 2 (CLCN2) (CLCN2)

Chloride voltage-gated channel 2 (CLCN2), also known as ClC-2, is a widely expressed transmembrane protein that facilitates the movement of chloride ions across cell membranes in response to hyperpolarization, cell swelling, and low pH. In the peripheral nervous system, it is expressed in both neurons and glial cells, such as Schwann cells, where it plays a critical role in maintaining chloride homeostasis and regulating membrane excitability. By providing a background chloride conductance, CLCN2 helps stabilize the resting membrane potential and prevents the development of ectopic discharges that can lead to neuropathic pain. Mutations in the CLCN2 gene are primarily associated with leukoencephalopathy and certain forms of epilepsy, highlighting its importance in myelin stability and neuronal network balance. Pharmacologically, CLCN2 is targeted by activators like lubiprostone to enhance chloride secretion in epithelial tissues, while its role in the nervous system makes it a potential target for modulating nerve conduction and treating sensory disturbances.

Other names

ClC-2Chloride channel protein 2CLC2Voltage-gated chloride channel 2Chloride channel, voltage-sensitive 2

Activation of CLCN2 increases chloride conductance, which typically stabilizes the resting membrane potential and prevents hyperexcitability in neurons and glia. Inhibition of the channel reduces chloride efflux, which can lead to membrane depolarization and increased excitability or impaired volume regulation.