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Bulletin of experimental biology and medicine

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


PMID 23330075

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.

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G8134
Gallamine triethiodide, ≥98% (TLC), powder, muscarinic receptor antagonist
C30H60I3N3O3