A photoisomerizable muscarinic antagonist. Studies of binding and of conductance relaxations in frog heart [PDF]
, 1982 These experiments employ the photoisomerizable compound, 3,3'-bis- [alpha-(trimethylammonium)methyl]azobenzene (Bis-Q), to study the response to muscarinic agents in frog myocardium. In homogenates from the heart, trans-Bis-Q blocks the binding of [3H]-N-
Birdsall, Nigel J. M. +5 more
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Pathophysiology of Cav1.3 L-type calcium channels in the heart
Frontiers in Physiology, 2023 Ca2+ plays a crucial role in excitation-contraction coupling in cardiac myocytes. Dysfunctional Ca2+ regulation alters the force of contraction and causes cardiac arrhythmias. Ca2+ entry into cardiomyocytes is mediated mainly through L-type Ca2+ channels,
Sahil Zaveri +10 more
doaj +1 more source
Complete atrial-specific knockout of sodium-calcium exchange eliminates sinoatrial node pacemaker activity. [PDF]
, 2013 The origin of sinoatrial node (SAN) pacemaker activity in the heart is controversial. The leading candidates are diastolic depolarization by "funny" current (If) through HCN4 channels (the "Membrane Clock" hypothesis), depolarization by cardiac Na-Ca ...
Alber, Sarah +13 more
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The sinoatrial node, a heterogeneous pacemaker structure [PDF]
Cardiovascular Research, 2000 This article focuses on the regional heterogeneity of the mammalian sinoatrial (SA) node in terms of cell morphology, pacemaker activity, action potential configuration and conduction, densities of ionic currents (i(Na), i(Ca,L), i(to), i(K,r), i(K,s) and i(f)), expression of gap junction proteins (Cx40, Cx43 and Cx45), autonomic regulation, and ageing.
M R, Boyett, H, Honjo, I, Kodama
openaire +2 more sources
Histopathological changes in the electrical conduction of cardiac nodes after acute myocardial infarction in dogs and horses, compared with findings in humans: A histological, morphometrical, and immunohistochemical study [PDF]
Veterinary World, 2023 Background and Aim: The heart conduction system is responsible for the occurrence of various types of cardiac arrhythmia. This study aimed to histologically and morphometrically describe damaged cardiac nodes during acute myocardial infarction and to ...
Fabián Gómez-Torres +2 more
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SCN5A and sinoatrial node pacemaker function [PDF]
Cardiovascular Research, 2007 The SCN5A gene encodes specific voltage-dependent Na+ channels abundant in cardiac muscle that open and close at specific stages of cardiac activity in response to voltage change, thereby controlling the magnitude and timecourse of voltage-dependent Na+ currents (iNa) in cardiac muscle cells.
Lei, Ming +3 more
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Parametric analysis of the ionic concentrations effects in the behavior of the sinoatrial node
Revista Facultad de Ingeniería Universidad de Antioquia, 2013 A sensibility study on the effect of ionic concentrations in the behavior of the sinoatrial node was carried out. The study was based on the model proposed by H. Zhang, A. V. Holden and M.R. Boyett.
Daniel Alfonso Sierra +2 more
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ATAC-Seq Reveals an Isl1 Enhancer That Regulates Sinoatrial Node Development and Function
Circulation Research, 2020 Supplemental Digital Content is available in the text. Rationale: Cardiac pacemaker cells (PCs) in the sinoatrial node (SAN) have a distinct gene expression program that allows them to fire automatically and initiate the heartbeat.
Giselle Galang +14 more
semanticscholar +1 more source
The role of inhibitory G proteins and regulators of G protein signaling in the in vivo control of heart rate and predisposition to cardiac arrhythmias [PDF]
, 2012 Inhibitory heterotrimeric G proteins and the control of heart rate. The activation of cell signaling pathways involving inhibitory heterotrimeric G proteins acts to slow the heart rate via modulation of ion channels.
Ang, R, Opel, A, Tinker, A
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Do human sinoatrial node cells have t-tubules?
Translational Research in Anatomy, 2021 Every heartbeat is generated by spontaneously depolarizing specialised nodal cells that make up the sinoatrial node (SN). The SN's unique properties depend on two complex mechanisms - the membrane-voltage and the Ca2+ clocks, regulated by strictly ...
Maria A. Petkova, Halina Dobrzynski
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