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

Target: α2δ-1
Molecular classification: Ion channel auxiliary subunit, Voltage-gated calcium channel regulatory protein

Overview

The voltage-gated calcium channel α2δ-1 subunit is an auxiliary protein that regulates the function and trafficking of voltage-gated calcium channels (mainly the Cav2 family) in neurons. Gabapentinoid drugs, which are structural analogs of gamma-aminobutyric acid (GABA) but do not act on GABA receptors, selectively bind to the α2δ-1 subunit. This reduces calcium influx and neurotransmitter release, which underlies their efficacy in disorders such as neuropathic pain and epilepsy. Notably, the therapeutic rationale for gabapentinoids is unrelated to GABAergic modulation[2][6].

Other names: Calcium channel α2δ-1 subunitCACNA2D1Alpha-2/delta-1 subunit

Mechanism of action

Gabapentinoids bind to the α2δ-1 subunit of voltage-gated calcium channels, inhibiting its trafficking to the cell membrane, thereby reducing neurotransmitter release and attenuating neuronal excitability and pain signaling[2][4][6].

Biological functions

Modulation of synaptic neurotransmitter releaseRegulation of calcium ion influxNeuronal excitability modulation

Disease associations

Neuropathic painEpilepsyAnxiety disordersFibromyalgia

Safety considerations

DizzinessSomnolencePeripheral edemaPotential for misuse (gabapentinoids)Dose adjustment required in renal impairment

Interacting drugs

Gabapentin

2 more in the full profile.

Biomarkers

Upregulation of α2δ-1 in sensory neurons (not a routine clinical biomarker, but observed in animal models of neuropathic pain)[2]

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