L-type and N-type voltage-gated calcium channels (L/N-type VGCC)

L-type and N-type high-voltage-activated calcium channels are critical components of the voltage-gated calcium channel (VGCC) family, serving as key regulators of calcium entry in excitable cells (Wikipedia, 2024). L-type channels (CaV1.1–CaV1.4) are primarily found in cardiac and smooth muscle, where they mediate excitation-contraction coupling, and in endocrine cells, where they regulate hormone secretion such as aldosterone (NIH, 2024). N-type channels (CaV2.2) are predominantly localized at presynaptic nerve terminals, where they trigger the release of neurotransmitters like norepinephrine and play a vital role in pain transmission and sympathetic nervous system activity (PubMed, 2019). Drugs that act as dual L/N-type blockers, such as cilnidipine, are utilized in the management of hypertension, offering advantages over L-type-selective blockers by suppressing sympathetic reflex activity and providing renoprotective effects through the dilation of both afferent and efferent renal arterioles (JAPI, 2024). These channels are also significant targets in the treatment of chronic pain and are being investigated for their roles in neurodegenerative and neuropsychiatric disorders (NIH, 2022). Structurally, these channels are heteromultimeric complexes consisting of a pore-forming alpha-1 subunit and auxiliary subunits that modulate channel kinetics and trafficking (StatPearls, 2023).

Other names

L-type calcium channelsN-type calcium channelsL/N-type calcium channel blocker targetHigh-voltage-activated calcium channelsHVA calcium channelsCaV1 and CaV2.2 channels

Blockade of the alpha-1 subunit of both L-type and N-type voltage-gated calcium channels, inhibiting the influx of calcium ions into cells.