Voltage-gated calcium channel subunit alpha2-delta-1 (α2δ-1)

Voltage-gated calcium channel subunit α2δ-1 is an auxiliary protein associated with the large family of voltage-gated calcium channels, specifically Cav1 and Cav2 types. It is encoded by the *CACNA2D1* gene, with its product enhancing trafficking to the cell membrane and increasing the density and activity of calcium channels at the cell surface. The α2δ-1 subunit alters voltage sensor properties and coupling, making calcium influx more efficient at physiological voltages in excitable cells. Its expression and function have established roles both in normal nerve and muscle signaling and in pathological states such as neuropathic pain and epilepsy. Gabapentinoid drugs, such as gabapentin and pregabalin, target α2δ-1 to achieve clinical benefit. The subunit may serve as both a therapeutic drug target and a biomarker for certain pain states.

Other names

Alpha-2/delta-1 subunitCACNA2D1 gene productCalcium channel auxiliary subunit α2δ-1

Drugs such as gabapentin and pregabalin bind to α2δ-1, inhibiting its function, which reduces calcium channel trafficking/surface expression and dampens calcium currents. This results in decreased neuronal excitability and neurotransmitter release, underlying therapeutic effects in neuropathic pain and epilepsy. The α2δ-1 subunit remodulates voltage-sensor coupling and fine-tunes the voltage dependence of channel activation.