Cinnamaldehyde inhibits L-type calcium channels in mouse ventricular cardiomyocytes and vascular smooth muscle cells
| Autor: | Sendoa Tajada, Yeranddy A. Alpizar, Julio Alvarez-Collazo, Thomas Voets, M. T. Pérez-García, Ana I. López-Medina, Karel Talavera, José R. López-López, Julio L. Alvarez, Bernd Nilius, Lucía Alonso-Carbajo |
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| Rok vydání: | 2014 |
| Předmět: |
Male
Chronotropic medicine.medical_specialty Cell type Vascular smooth muscle Calcium Channels L-Type Physiology Heart Ventricles Vasodilator Agents Myocytes Smooth Muscle Clinical Biochemistry Muscle Smooth Vascular Mice Transient Receptor Potential Channels Physiology (medical) Internal medicine medicine Animals Myocyte Myocytes Cardiac L-type calcium channel Acrolein Rats Wistar Receptor TRPA1 Cation Channel Voltage-dependent calcium channel Chemistry Calcium channel Calcium Channel Blockers Myocardial Contraction Mesenteric Arteries Rats Mice Inbred C57BL Vasodilation Endocrinology Vasoconstriction Biophysics |
| Zdroj: | Pflügers Archiv - European Journal of Physiology. 466:2089-2099 |
| ISSN: | 1432-2013 0031-6768 |
| Popis: | Cinnamaldehyde (CA), a major component of cinnamon, is known to have important actions in the cardiovascular system, including vasorelaxation and decrease in blood pressure. Although CA-induced activation of the chemosensory cation channel TRPA1 seems to be involved in these phenomena, it has been shown that genetic ablation of Trpa1 is insufficient to abolish CA effects. Here, we confirm that CA relaxes rat aortic rings and report that it has negative inotropic and chronotropic effects on isolated mouse hearts. Considering the major role of L-type Ca(2+) channels in the control of the vascular tone and cardiac contraction, we used whole-cell patch-clamp to test whether CA affects L-type Ca(2+) currents in mouse ventricular cardiomyocytes (VCM, with Ca(2+) as charge carrier) and in mesenteric artery smooth muscle cells (VSMC, with Ba(2+) as charge carrier). We found that CA inhibited L-type currents in both cell types in a concentration-dependent manner, with little voltage-dependent effects. However, CA was more potent in VCM than in VSMC and caused opposite effects on the rate of inactivation. We found these divergences to be at least in part due to the use of different charge carriers. We conclude that CA inhibits L-type Ca(2+) channels and that this effect may contribute to its vasorelaxing action. Importantly, our results demonstrate that TRPA1 is not a specific target of CA and indicate that the inhibition of voltage-gated Ca(2+) channels should be taken into account when using CA to probe the pathophysiological roles of TRPA1. |
| Databáze: | OpenAIRE |
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