Peculiar effects of muscarinic M1, M2, and M3 receptor blockers on cardiac chronotropic function in neonatal rats.

N I Ziyatdinova, A M Sergeeva, R E Dementieva, T L Zefirov

Department of Anatomy, Physiology, and Human Health Protection, Kazan (Volga Region) Federal University, Russia.

Bulletin of experimental biology and medicine 2012 Nov

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The effects of muscarinic M(1), M(2), and M(3) cholinergic receptor blockade on the regulation of chronotropic function of the heart were studied in vivo in 7-day-old rat pups. Intravenous injection of M(2) receptor blocker gallamine produced no changes in cardiac chronotropy. In contrast, M(1) receptor blocker pirenzepine and M(3) receptor blocker 4DAMP provoked bradycardia. These data attest to the involvement of M(1) and especially M(3) cholinergic receptors in the regulation of cardiac chronotropy in rat pups, which confirms the view on pronounced species-specific and age-related peculiarities in the heart control mechanisms.

Citation

N I Ziyatdinova, A M Sergeeva, R E Dementieva, T L Zefirov. Peculiar effects of muscarinic M1, M2, and M3 receptor blockers on cardiac chronotropic function in neonatal rats. Bulletin of experimental biology and medicine. 2012 Nov;154(1):1-2