Voltage-dependent N-type calcium channel subunit alpha-1B (CaV2.2) (CaV2.2)

N-type voltage-gated calcium channels, specifically the pore-forming subunit alpha-1B (CaV2.2), are high-voltage-activated ion channels predominantly localized at presynaptic nerve terminals and dendrites in the central and peripheral nervous systems [1, 5]. They play a pivotal role in converting action potentials into intracellular calcium signals, which trigger the exocytosis of various neurotransmitters, including glutamate, GABA, and substance P [5, 13]. These channels are critical components of the nociceptive pathway, specifically mediating the transmission of pain signals from primary afferent fibers to the dorsal horn of the spinal cord [2, 11]. Dysregulation or overexpression of CaV2.2 has been implicated in chronic and neuropathic pain, as well as neurological disorders such as migraine and myoclonus-dystonia [2, 6, 11]. Pharmacological targeting of these channels primarily involves direct blockade, as seen with the intrathecal peptide analgesic ziconotide, or indirect modulation of channel trafficking and activity by gabapentinoids like pregabalin [3, 9, 15, 21]. Therapeutic development is often challenged by narrow safety windows, as the channels are essential for normal neuronal signaling, leading to potential side effects like dizziness, confusion, and ataxia [3, 5, 21].

Other names

CACNA1BN-type voltage-gated calcium channelCalcium channel, L type, alpha-1 polypeptide isoform 5Brain calcium channel IIIBIII

Blockade of calcium ion influx into presynaptic terminals, which inhibits the release of pro-nociceptive neurotransmitters such as glutamate and substance P in the dorsal horn of the spinal cord.