Results 31 to 40 of about 1,321,275 (276)
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
openaire +3 more sources
Function and Dysfunction of Human Sinoatrial Node [PDF]
Korean Circulation Journal, 2015 Sinoatrial node (SAN) automaticity is jointly regulated by a voltage (cyclic activation and deactivation of membrane ion channels) and Ca(2+) clocks (rhythmic spontaneous sarcoplasmic reticulum Ca(2+) release). Using optical mapping in Langendorff-perfused canine right atrium, we previously demonstrated that the β-adrenergic stimulation pushes the ...
Joung, Boyoung, Chen, Peng-Sheng
openaire +4 more sources
Endogenous driving and synchronization in cardiac and uterine virtual tissues: bifurcations and local coupling [PDF]
, 2006 Cardiac and uterine muscle cells and tissue can be either autorhythmic or excitable. These behaviours exchange stability at bifurcations produced by changes in parameters, which if spatially localized can produce an ectopic pacemaking focus.
Benson, A.P. +4 more
core +1 more source
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
core +1 more source
Nature Communications, 2020 Mechanisms for human sinoatrial node (SAN) dysfunction are poorly understood and whether human SAN excitability requires voltage-gated sodium channels (Nav) remains controversial.
Ning Li +20 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
core +1 more source
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 early stages of heart development: insights from chicken embryos [PDF]
, 2016 The heart is the first functioning organ in the developing embryo and the detailed understanding of the molecular and cellular mechanisms involved in its formation provides insights into congenital malformations affecting its function and therefore the ...
Alsan +19 more
core +2 more sources
Frontiers in Physiology, 2020 The rhythmic electrical activity of the heart’s natural pacemaker, the sinoatrial node (SAN), determines cardiac beating rate (BR). SAN electrical activity is tightly controlled by multiple factors, including tissue stretch, which may contribute to ...
L. Katsnelson +8 more
semanticscholar +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
core +2 more sources