The effect of verapamil-induced blockade of L-type calcium ionic currents (ICa,L) on the action of non-selective adrenergic cardiac stimulation by norepinephrine was examined during different periods of early postnatal ontogeny. In 1-week-old rats, intravenous norepinephrine induced a short-term tachycardia both with and without preliminary injected verapamil. In 3-week-old rats, norepinephrine alone produced no chronotropic effect; in contrast, it induced a biphasic tachycardia in verapamil-treated rats. In 6- and 20-month-old rats, norepinephrine induced a short-term tachycardia, which could be prevented by verapamil. The age-related peculiarities of chronotropic action of non-selective adrenergic stimulation are indicative of the role of L-type calcium ionic channels in the development of sympathetic control over the heart.
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Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 161, No. 6, pp. 696-699, June, 2016
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Zefirov, T.L., Kuptsova, A.M., Biktemirova, R.G. et al. Effect of ICa,L Blockade on Adrenergic Stimulation in Developing Heart. Bull Exp Biol Med 161, 746–748 (2016). https://doi.org/10.1007/s10517-016-3500-5
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DOI: https://doi.org/10.1007/s10517-016-3500-5