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Voltage-Gated Calcium Channel Alpha-2-Delta Subunit (α2δ)

Target: α2δ
Molecular classification: Voltage-gated calcium channel auxiliary subunit, Ion channel subunit

Overview

The voltage-gated calcium channel alpha-2-delta (α2δ) subunit is an auxiliary protein component of high-voltage activated calcium channels. It plays a critical role in modulating the trafficking, density, and biophysical properties of these channels at the plasma membrane. It is encoded by four genes: CACNA2D1, CACNA2D2, CACNA2D3, and CACNA2D4. The α₂δ₋₁ and α₂δ₋₂ isoforms are molecular targets for gabapentinoid drugs like gabapentin and pregabalin, used for neuropathic pain and epilepsy. Recent research indicates that some alpha‐2/delta proteins interact directly with glutamate receptors or extracellular matrix proteins—suggesting broader roles beyond classic channel modulation.

Other names: VGCC α2δ subunitCACNA2D1CACNA2D2CACNA2D3CACNA2D4Alpha-2-Delta subunit

Mechanism of action

Binding to α₂δ₋₁ and α₂δ₋₂ subunits, reducing calcium influx and abnormal excitability.

Biological functions

Calcium channel modulationRegulation of calcium current densityNeuronal excitability regulationTrafficking of VGCC complexesSubcellular targeting of channels

Disease associations

Neuropathic painEpilepsyCerebellar ataxia

Interacting drugs

Gabapentin

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