title: Peculiar effects of muscarinic M1, M2, and M3 receptor blockers on cardiac chronotropic function in neonatal rats.
abstract: 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.
authors: Department of Anatomy, Physiology, and Human Health Protection, Kazan (Volga Region) Federal University, Russia.
authors: N I
authors: NI
authors: Ziyatdinova
authors: A M
authors: AM
authors: Sergeeva
authors: R E
authors: RE
authors: Dementieva
authors: T L
authors: TL
authors: Zefirov
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D005703:Gallamine Triethiodide / Q000494:pharmacology; D006339:Heart Rate / Q000187:drug effects* / Q000502:physiology*; D018727:Muscarinic Antagonists / Q000494:pharmacology*; D010880:Piperidines / Q000494:pharmacology; D010890:Pirenzepine / Q000494:pharmacology; D051381:Rats; D043643:Receptor, Muscarinic M1 / Q000037:antagonists & inhibitors*; D043585:Receptor, Muscarinic M2 / Q000037:antagonists & inhibitors*; D043587:Receptor, Muscarinic M3 / Q000037:antagonists & inhibitors*; D013268:Stimulation, Chemical; D014630:Vagus Nerve / Q000502:physiology
chemical_list: D018727:Muscarinic Antagonists; D010880:Piperidines; D043643:Receptor, Muscarinic M1; D043585:Receptor, Muscarinic M2; D043587:Receptor, Muscarinic M3; D010890:Pirenzepine; C042375:4-diphenylacetoxy-1,1-dimethylpiperidinium; D005703:Gallamine Triethiodide