Pharmacological Effects of Terpenoids on Vascular Smooth Muscle

Terpenoids exert significant modulatory effects on vascular smooth muscle tone through diverse molecular mechanisms. Both monoterpenoids (for example carveol, perillyl alcohol and limonene) and sesquiterpenoids (notably farnesol and trans-caryophyllene) have been shown to induce vasorelaxation by targeting ion channels, intracellular kinases and endothelial pathways. Endothelium-dependent relaxation often involves nitric oxide synthesis and subsequent activation of the cyclic GMP–protein kinase G cascade. Endothelium-independent mechanisms include blockade of L-type calcium channels, activation of ATP-sensitive and voltage-dependent potassium channels, and inhibition of Rho-kinase and protein kinase C. Structure–activity analyses highlight the importance of functional moieties—hydroxyl groups, epoxide rings and isoprenoid chain length—in determining potency and selectivity. These agents demonstrate efficacy against both electro-mechanical and pharmaco-mechanical coupling in isolated arterial preparations, human umbilical arteries and cultured vascular myocytes. The pharmacological profile of terpenoids underscores their potential for development as adjunctive treatments in hypertension, pre-eclampsia and other vascular disorders, combining natural origin with multi-target actions and a favourable tolerability profile. Ongoing research aims to refine the balance between bioavailability, tissue selectivity and therapeutic index to deliver clinically viable phytotherapeutics for global cardiovascular health.

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Pharmacological Effects of Terpenoids on Vascular Smooth Muscle publication trend

The graph below shows the total number of articles in pharmacological effects of terpenoids on vascular smooth muscle across all publications each year (not limited to Nature Index journals).

Technical terms

Terpenoids: Natural compounds built from isoprene units, abundant in essential oils and plant extracts, with diverse bioactivities.

Vascular smooth muscle: Contractile cells in blood vessel walls that regulate vessel diameter and blood flow.

Vasorelaxation: Relaxation of vascular smooth muscle leading to dilation of blood vessels and reduced vascular resistance.

Endothelium-dependent relaxation: Vasodilation mediated by factors released from endothelial cells, chiefly nitric oxide.

L-type calcium channels: Voltage-gated channels in smooth muscle membranes that control Ca2+ influx and contraction.

NO–cGMP–PKG pathway: Signalling cascade initiated by nitric oxide, increasing cyclic GMP and activating protein kinase G to induce smooth muscle relaxation.

References

1. Cinnamyl alcohol attenuates vasoconstriction by activation of K+ channels via NO-cGMP-protein kinase G pathway and inhibition of Rho-kinase. Experimental & Molecular Medicine (2012).
2. Hydroxyl Group and Vasorelaxant Effects of Perillyl Alcohol, Carveol, Limonene on Aorta Smooth Muscle of Rats. Molecules (2018).
3. Farnesol Inhibits L-type Ca2+ Channels in Vascular Smooth Muscle Cells*. Journal of Biological Chemistry (1997).
4. Relaxant Effect of Monoterpene (−)-Carveol on Isolated Human Umbilical Cord Arteries and the Involvement of Ion Channels. Molecules (2020).
5. Structural relationships and vasorelaxant activity of monoterpenes. DARU Journal of Pharmaceutical Sciences (2012).