Voltage-dependent calcium channel α2δ-1 subunit (α2δ-1)

The **voltage-dependent calcium channel α2δ-1 subunit** is an **auxiliary protein** associated with high-voltage–activated (e.g., L-type and N-type) calcium channels in neurons, muscle, and cardiac tissue[1][2][5][7]. It is anchored to the extracellular side of the membrane, increasing calcium current density by promoting trafficking and functional expression of the α1 pore-forming subunits on the plasma membrane and altering channel gating properties[1][3][5]. The α2δ-1 subunit also acts as a receptor for gabapentinoid drugs (gabapentin, pregabalin), which alleviates neuropathic pain by inhibiting pathological channel trafficking and neurotransmitter release[4][7]. Beyond its auxiliary channel functions, α2δ-1 is involved in synaptic organization through interactions with thrombospondins and is implicated in multiple neurological and cardiovascular disorders[6][7].

Other names

Calcium channel, voltage-dependent, α2/δ subunit 1CACNA2D1α2δ1Calcium channel α2/δ-1 subunit

Gabapentinoids bind to the α2δ-1 subunit, inhibiting trafficking of voltage-gated calcium channels to the membrane, reducing synaptic calcium influx and neurotransmitter release, thus diminishing pain signaling