Results 61 to 70 of about 455,752 (196)

Demonstration of beat‐to‐beat, on‐demand ATP synthesis in ventricular myocytes reveals sex‐specific mitochondrial and cytosolic dynamics

The Journal of Physiology, EarlyView.
Abstract figure legend Beat‐locked mitochondrial ATP transients reveal modular, sex‐specific bioenergetic control during excitation–contraction coupling. A, each action potential activates L‐type CaV1.2 channels, producing a Ca2+ influx that triggers ryanodine receptors (RyR2) and elicits SR Ca2+ release.
Paula Rhana, Collin Matsumoto, L. Fernando Santana   +2 more
wiley   +1 more source

When NCX switches sides: Experimental and computational insights into Ca2+ regulation in the heart

The Journal of Physiology, EarlyView.
Abstract figure legend Due to its presence inside the dyadic cleft, Na+/Ca2+ exchanger (NCX) builds a functional unit together with L‐type calcium channels and ryanodine receptors in the dyadic cleft. NCX acts bidirectionally (forward and reverse mode) dependent on extracellular calcium ([Ca2+]o) and sodium ([Na+]o) concentrations and the membrane ...
Wilhelm Neubert, Judith Hüttemeister, Paulina Sander, Nagaiah Chamakuri, Felix Hohendanner, Martin Falcke, Frank R. Heinzel   +6 more
wiley   +1 more source

Computer Three-Dimensional Reconstruction of the Sinoatrial Node [PDF]

Circulation, 2005
Background— There is an effort to build an anatomically and biophysically detailed virtual heart, and, although there are models for the atria and ventricles, there is no model for the sinoatrial node (SAN).
Dobrzynski, H.; id_orcid 0000-0003-4754-5975, Li, J., Tellez, J., Greener, I. D., Nikolski, V. P., Wright, S. E., Parson, S. H., Jones, S. A., Lancaster, M. K., Yamamoto, M., Honjo, H., Takagishi, Y., Kodama, I., Efimov, I. R., Billeter, R., Boyett, M. R.   +15 more
openaire   +2 more sources

A case report of sinoatrial arrest caused by temporal lobe epilepsy in subclinical glioblastoma

BMC Cardiovascular Disorders, 2020
Background Atrial fibrillation with symptomatic bradycardia, higher grade atrioventricular block, and sinus node disease are all common indications for permanent pacemaker implantation.
Jörg Reifart, Marlene Tschernatsch, Christian W. Hamm, Johannes Sperzel, Andreas Hain   +4 more
doaj   +1 more source

An age‐associated decline in the role of the sarcoplasmic reticulum and associated calcium‐handling proteins sets the pace for sinoatrial node function

The Journal of Physiology, EarlyView.
Abstract figure legend Stable, responsive pacemaking in the sinoatrial node is driven by the activity of the funny current (membrane clock), interplay of calcium cycling and release from the sarcoendoplasmic reticulum with depolarising sodium‐calcium exchange current (calcium clock). With increasing age, key proteins associated with calcium cycling are
Sandra A. Jones, Fiona S. Godbeer, Matthew K. Lancaster   +2 more
wiley   +1 more source

The morphologic development of the sinoatrial node in the mouse

The American Journal of Cardiology, 1970
Abstract A plastic embedding technique was employed on mouse embryos after fixation with a gluteraldehyde-paraformaldehyde mixture and preparation of large, 1 to 2 μ sections cut on a rotary microtome with steel knives. It was then possible to trace the sinoatrial node back to mouse embryos of 4 sol1 2 mm crown-rump length ( 10 1 2 days
Departments of Pediatrics (Cardiology) and Pathology, University of Florida College of Medicine, Gainesville, Fla. 32601 USA ( host institution ), Van Mierop, L.H.S., Gessner, Ira H.   +2 more
openaire   +3 more sources

One-dimensional rabbit sinoatrial node models: benefits and limitations

, 2003
INTRODUCTION: Cardiac multicellular modeling has traditionally focused on ventricular electromechanics. More recently, models of the atria have started to emerge, and there is much interest in addressing sinoatrial node structure and function.
Garny, A, Hunter, PJ, Boyett, MR, Kohl, P, Noble, D, Noble, Denis   +5 more
core   +1 more source

HL-1 cells express an inwardly rectifying K+ current activated via muscarinic receptors comparable to that in mouse atrial myocytes [PDF]

, 2010
An inwardly rectifying K^+ current is present in atrial cardiac myocytes that is activated by acetylcholine (I_{KACh}). Physiologically, activation of the current in the SA node is important in slowing the heart rate with increased parasympathetic tone ...
Muriel Nobles, Sonia Sebastian, Tinker, A., Andrew Tinker, Nobles, M., Sebastian, S., Nobles, Muriel   +6 more
core   +1 more source

TRIP8bnano peptide prevents cAMP binding to HCN2 channels alleviating pain‐like behaviors in rats with neuropathic pain

The Journal of Physiology, EarlyView.
Abstract figure legend We tested the hypothesis that cAMP binding to HCN2 channels in nociceptors is a causal driver of neuropathic pain by using TRIP8bnano, a synthetic peptide we previously developed as a selective antagonist of cAMP in HCN channels. TRIP8bnano effectively abolishes cAMP potentiation of HCN2 currents in small‐diameter DRG neurons and
Santiago I. Loya‐Lopez, Kimberly Gomez, Alessandro Porro, Gerhard Thiel, Anna Moroni, Heather N. Allen, Rajesh Khanna, Andrea Saponaro   +7 more
wiley   +1 more source

Regional electrical differences and arrhythmia in the rat atria: Role of sympathetic nerve distribution and function

The Journal of Physiology, EarlyView.
Abstract figure legend Atrial fibrillation commonly develops in the left atrium and pulmonary veins (PVs), and can be triggered by sympathetic nerve activity. Here, we examined regional atrial differences in sympathetic nerve distribution and function in the rat.
James Saleeb‐Mousa, Manish Kalla, Neil Herring, Christopher O'Shea, Andrew M. Coney, Keith L. Brain, Andrew P. Holmes   +6 more
wiley   +1 more source