Vascular smooth muscle cell calcium influx mechanisms (VSMC Ca2+ influx)

Calcium influx mechanisms in vascular smooth muscle cells (VSMCs) encompass the diverse pathways through which calcium ions enter the cytosol to trigger contraction and regulate cellular functions [StatPearls: Calcium Channel Blockers]. The primary pathway involves voltage-gated calcium channels (VGCCs), particularly the L-type Cav1.2 channel, which opens in response to membrane depolarization [PubMed: PMC2885005]. Other critical mechanisms include store-operated calcium entry (SOCE), mediated by STIM1 and Orai1, and receptor-operated calcium entry (ROCE), often involving the Transient Receptor Potential (TRP) channel family [PubMed: PMC3579373, Pharmacological Reviews: TRP channels]. These pathways are essential for maintaining vascular tone and systemic blood pressure, but their dysregulation is a key driver in the pathogenesis of hypertension, atherosclerosis, and pulmonary arterial hypertension [Circulation Research: VSMC in Hypertension]. Pharmacological intervention typically targets these mechanisms using calcium channel blockers (CCBs) like amlodipine and diltiazem, which are widely used to treat cardiovascular disorders by inducing vasodilation [NIH: LiverTox - Calcium Channel Blockers]. Beyond contraction, these calcium influx pathways also influence VSMC proliferation and migration, making them targets for preventing vascular remodeling and restenosis [Journal of Molecular and Cellular Cardiology]. Emerging therapies are exploring the inhibition of specific TRP and Orai channels to provide more selective control over vascular remodeling without the systemic side effects of traditional CCBs [Nature: Calcium signaling].

Other names

Vascular smooth muscle cell calcium entryVoltage-gated calcium entryStore-operated calcium entry (SOCE)Receptor-operated calcium entry (ROCE)Calcium signaling in vascular smooth muscle

Inhibition of calcium ion influx through voltage-dependent or store-operated channels to promote vasodilation and reduce vascular resistance.