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

Voltage-dependent calcium channel α2δ subunit 1 is an extracellular auxiliary subunit of high-voltage activated voltage-gated calcium channels, prominently α1 and β subunit complexes[1][2][4]. The α2δ-1 subunit plays a fundamental role in increasing surface expression, density, and voltage sensitivity of these calcium channels, thereby facilitating calcium influx crucial for cellular excitability and neurotransmitter release[1][3]. It is predominantly expressed in neurons of both central and peripheral nervous systems and is involved in synaptic development, neuronal signaling, and plasticity[2]. α2δ-1 serves as the primary binding site for gabapentinoid drugs (gabapentin, pregabalin), mediating their therapeutic effects in neuropathic pain and certain types of epilepsy via modulation of channel trafficking and function, especially by reducing aberrant excitatory neurotransmission seen in these disorders[2][4][6][8]. Overexpression of α2δ-1 is associated with increased pain signaling in neuropathic conditions, and targeting this subunit has become an established therapeutic strategy for managing neuropathic pain[6].

Other names

Calcium channel α2δ1 subunitCacna2d1 (gene symbol)Calcium channel auxiliary subunit α2δ1Cavα2δ1

Inhibition of calcium influx by binding to the α2δ-1 subunit, thereby altering trafficking and function of voltage-gated calcium channels[4][6][7][8]