Ion Channel Mechanisms in Vascular Smooth Muscle Proliferation

Vascular smooth muscle cells (VSMCs) inhabit the medial layer of blood vessels and ordinarily maintain a contractile, non‐proliferative phenotype. In response to injury, inflammatory mediators or growth factors, VSMCs undergo phenotypic switching to a synthetic state characterised by enhanced proliferation, migration and matrix synthesis. Central to this transition is the regulation of membrane potential and intracellular Ca2+ concentration by specific ion channels. Intermediate (KCa3.1) and large‐conductance (BKαβ1) Ca2+‐activated K+ channels collaborate with non‐selective cation channels (notably TRPC1) to modulate Ca2+ influx either directly or by setting the driving force for receptor‐operated entry. The resultant Ca2+ transients activate downstream kinases, in particular the ERK1/2 mitogen‐activated protein kinase cascade, and transcriptional programmes involving CREB, c‐Fos and cyclins. Through these pathways, ion channels exert tight control over cell‐cycle progression, governing the formation of neointimal hyperplasia, restenosis and aspects of atherosclerotic remodelling. Furthermore, emerging evidence indicates cross‐talk between ion channel activation and G‐protein signalling in fine‐tuning proliferative responses, underscoring the complexity and therapeutic potential of targeting channel‐dependent mechanisms in vascular disease.

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Ion Channel Mechanisms in Vascular Smooth Muscle Proliferation publication trend

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Technical terms

Intermediate conductance Ca2+‐activated K+ channel (KCa3.1): A potassium channel activated by rises in intracellular calcium, contributing to membrane hyperpolarisation and promoting sustained Ca2+ entry in VSMCs.

Large‐conductance Ca2+‐ and voltage‐activated K+ channel (BKαβ1): A high‐conductance K+ channel sensitive to both intracellular calcium and membrane voltage, which regulates vascular tone and influences proliferative responses.

TRPC1 channel: A member of the transient receptor potential canonical family that mediates receptor‐operated and store‐depletion Ca2+ entry, integrating extracellular signals with intracellular kinase pathways.

ERK1/2 pathway: A mitogen‐activated protein kinase cascade that transduces extracellular growth cues into nuclear transcriptional programmes governing cell proliferation and survival.

Platelet‐derived growth factor‐BB (PDGF‐BB): A dimeric growth factor that binds PDGF receptor β, triggering downstream signalling through kinases such as ERK1/2 and modulating ion channel activity to drive VSMC proliferation.

References

1. The Intermediate Conductance Calcium-activated Potassium Channel KCa3.1 Regulates Vascular Smooth Muscle Cell Proliferation via Controlling Calcium-dependent Signaling*. Journal of Biological Chemistry (2013).
2. Tungstate-Targeting of BKαβ1 Channels Tunes ERK Phosphorylation and Cell Proliferation in Human Vascular Smooth Muscle. PLOS ONE (2015).
3. Functional cooperation between IKCa and TRPC1 channels regulates serum‐induced vascular smooth muscle cell proliferation via mediating Ca2+ influx and ERK1/2 activation. Cell Proliferation (2022).