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Vascular Effects of Calcium Channel Antagonists: New Evidence

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Abstract

Calcium channel antagonists have a well-established role in the management of cardiovascular diseases. L-type calcium channels in vascular cells are a key therapeutic target in hypertension and are the preferred molecular target of the initial calcium channel antagonists. However, third-generation dihydropyridine (DHP) calcium channel antagonists, including manidipine, nilvadipine, benidipine and efonidipine, appear to have effects in addition to blockade of the L-type calcium channel. Voltage-gated calcium channels are widely expressed throughout the cardiovascular system. They constitute the main route for calcium entry, essential for the maintenance of contraction. Cardiac and vascular cells predominantly express L-type calcium channels. More recently, T-type channels have been discovered, and there is emerging evidence of their significance in the regulation of arterial resistance. A lack of functional expression of L-type channels in renal efferent arterioles may be consistent with an important role of T-type channels in the regulation of efferent arteriolar tone. Although the exact role of T-type calcium channels in vascular beds remains to be determined, they could be associated with gene-activated cell replication and growth during pathology. The three major classes of calcium channel antagonists are chemically distinct, and exhibit different functional effects depending on their biophysical, conformation-dependent interactions with the L-type calcium channel. The DHPs are more potent vasodilators, and generally have less cardiode-pressant activity than representatives of other classes of calcium channel antagonist such as diltiazem (a phenylalkylamine) and verapamil (a benzothiazepine). In contrast to older calcium channel antagonists, the newer DHPs, manidipine, nilvadipine, benidipine and efonidipine, dilate not only afferent but also efferent renal arterioles, a potentially beneficial effect that may improve glomerular hypertension and provide renoprotection. The underlying mechanisms for the heterogenous effects of calcium channel antagonists in the renal microvasculature are unclear. A credible hypothesis suggests a contribution of T-type calcium channels to efferent arteriolar tone, and that manidipine, nilvadipine and efonidipine inhibit both L and T-type channels. However, other mechanisms, including an effect on neuronal P/Q-type calcium channels (recently detected in arterioles), the microheterogeneity of vascular beds, and other types of calcium influx may also play a role. This article presents recent data about the expression and physiological role of calcium channels in arteries and the molecular targets of the calcium channel antagonists, particularly those exhibiting distinct renovascular effects.

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  1. Physiopathologie Cardiovasculaire, CHU Arnaud de Villeneuve, INSERM U-637; Université Montpellier 1, 34295, Montpellier Cedex 5, France

    Sylvain Richard

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Richard, S. Vascular Effects of Calcium Channel Antagonists: New Evidence. Drugs 65 (Suppl 2), 1–10 (2005). https://doi.org/10.2165/00003495-200565002-00002

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