Alpha-2-delta subunit of voltage-dependent calcium channel (α2δ subunit)

The **Alpha-2-delta subunit of voltage-dependent calcium channel** is an integral, auxiliary component of high voltage-activated calcium channels (CaV1/CaV2 types). It exists as four isoforms in humans (α2δ-1 to α2δ-4), each encoded by different CACNA2D genes. The subunit increases the channels' expression at the plasma membrane, augments calcium current density, and modulates channel kinetics and voltage-dependence, thereby shaping the activity of the pore-forming α1 subunit. Biologically, these subunits are essential for normal neurotransmission and synaptic plasticity; mutations or dysregulation are implicated in diseases such as epilepsy, neuropathic pain, and ataxia. α2δ-1 and α2δ-2 subunits are high-affinity binding sites for gabapentinoid drugs (gabapentin, pregabalin), which act by disrupting channel trafficking and reducing synaptic neurotransmitter release, particularly glutamate. The α2δ subunit is now a validated therapeutic target for several CNS disorders, though side effects such as sedation and dizziness are common during treatment[1][2][3][4][6][7][8][10].

Other names

alpha2delta subunitα2δ subunitvoltage-gated calcium channel alpha-2/delta subunitCaV alpha-2/delta subunitCACNA2D (gene family)alpha-2/delta-1, alpha-2/delta-2, alpha-2/delta-3, alpha-2/delta-4 (isoforms)

Inhibition of neurotransmitter release via binding to the α2δ-1 or α2δ-2 subunit (thus modulating calcium channel function) - Inhibition of trafficking of voltage-gated calcium channels to the cell membrane