Results 101 to 110 of about 17,120 (211)

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 interplay between dynamic regulation of ion‐channel gating and trafficking in cardiac arrhythmogenesis

The Journal of Physiology, EarlyView.
Abstract figure legend Cardiac cellular electrophysiology is modulated by multiple factors, including temperature, extracellular K+, heart rate/pacing frequency, and drugs. These modulators can have distinct effects on ion‐channel gating and transcription/trafficking over time.
Stefan Meier, Anna S. Savchenko, Paul G. A. Volders, Jordi Heijman   +3 more
wiley   +1 more source

Multiscale mechanistic modelling of heterogeneity in cardiac sub‐cellular calcium handling accounting for variable t‐system density

The Journal of Physiology, EarlyView.
Abstract figure legend Illustration of spatial calcium dynamics (left panels) and the state cycle approximation (middle panel) that enables reduced simulation of spatially dependent dynamics without explicit description of space (right panels). The selected example here illustrates a spontaneous calcium wave, showing temporal snapshots of local calcium
Michael A Colman, Yohannes Shiferaw, David Conesa   +2 more
wiley   +1 more source

Sedentary ageing remodels the structure–function relationships that underlie calcium signalling at super‐resolution scales in the heart

The Journal of Physiology, EarlyView.
Abstract figure legend Illustration of calcium spark function and ryanodine receptor (RyR) structure within a sedentary model of ageing. Upon sympathetic stimulation from 1 µM isoprenaline a linear response to calcium spark morphology occurred, accompanied by a biphasic progression of RyR remodelling across age.
Miriam E. Hurley, David Conesa, Alan P. Benson, Michael A. Colman   +3 more
wiley   +1 more source

Old dog, new trick: Charybdotoxin as a novel ryanodine receptor blocker

The Journal of Physiology, EarlyView.
Abstract figure legend The peptide toxin charybdotoxin (ChTx) from the scorpion Leiurus quinquestriatus was tested on single‐channel currents of the ryanodine receptor incorporated into planar lipid bilayers. The structure–function relationship of ChTx was investigated using toxin variants generated by isosteric substitutions of the basic amino acids ...
Zsuzsanna Édua Magyar, Judit Hevesi, Frigyes Mészáros, Zsolt Bozsó, János Szolomájer, Gábor Tóth, György Panyi, Péter Enyedi, Zoltán Varga, Zoltán Pethő, János Almássy   +10 more
wiley   +1 more source

Structural basis for simvastatin-induced skeletal muscle weakness associated with type 1 ryanodine receptor T4709M mutation

The Journal of Clinical Investigation
Statins lower cholesterol, reducing the risk of heart disease, and are among the most frequently prescribed drugs. Approximately 10% of individuals develop statin-associated muscle symptoms (SAMS; myalgias, rhabdomyolysis, and muscle weakness), often ...
Gunnar Weninger, Haikel Dridi, Steven Reiken, Qi Yuan, Nan Zhao, Linda Groom, Jennifer Leigh, Yang Liu, Carl Tchagou, Jiayi Kang, Alexander Chang, Estefania Luna-Figueroa, Marco C. Miotto, Anetta Wronska, Robert T. Dirksen, Andrew R. Marks   +15 more
doaj   +1 more source

Interactive Role of the DHPR β_1a SH3 Domain in Skeletal Muscle Excitation–Contraction Coupling

Biomolecules
Excitation–contraction (EC) coupling in skeletal muscle requires a physical interaction between the voltage-gated calcium channel, dihydropyridine receptor (DHPR), and the ryanodine receptor (RyR1) Ca2+ release channel.
Yamuna Karunasekara, Shouvik Aditya, Nicole C. Norris, Jean Cappello, Angela F. Dulhunty, Philip G. Board, Jose M. Eltit, Claudio F. Perez, Marco G. Casarotto   +8 more
doaj   +1 more source

Phillygenin Suppresses Glutamate Exocytosis in Rat Cerebrocortical Nerve Terminals (Synaptosomes) through the Inhibition of Ca_v2.2 Calcium Channels

Biomedicines
Glutamate is a major excitatory neurotransmitter that mediates neuronal damage in acute and chronic brain disorders. The effect and mechanism of phillygenin, a natural compound with neuroprotective potential, on glutamate release in isolated nerve ...
Ming-Yi Lee, Tzu-Yu Lin, Ya-Ying Chang, Kuan-Ming Chiu, Su-Jane Wang   +4 more
doaj   +1 more source

Testicular SIRT1 Loss Reveals an Aging‐Like Proteomic Landscape and Precipitates Reproductive Deterioration

Andrology, Volume 14, Issue 6, Page 1579-1589, September 2026.
ABSTRACT Background Advanced paternal age is associated with reduced male fertility and testicular dysfunction. Among the molecular regulators involved in aging, SIRT1, a NAD+‐dependent deacetylase, plays a pivotal role in maintaining oxidative balance and cellular homeostasis.
María Iniesta‐Cuerda, Jiřina Havránková, Hedvika Řimnáčová, Jiří Moravec, František Liška, Martin Knytl, Milena Králíčková, Jan Nevoral   +7 more
wiley   +1 more source

Polarized Light Microscopy for Quantitative Assessment of Sarcomere‐Scale Structural Order in Cardiac Tissue

Journal of Biophotonics, Volume 19, Issue 8, August 2026.
Impact of cardiac and respiratory arrest on cardiac muscle tissue. Wistar rats were injected (on the left) either with cisatracurium to induce a respiratory arrest or lidocaine to induce a cardiac arrest (in the middle). Further, the pathophysiological changes developed and were assessed with linear polarization microscopy at 600–3000 nm wavelength ...
Gennadii Piavchenko, Artem Venediktov, Zoya Shamitko, Karina Urazova, Mariia Obelchakova, Evelina Khabarova, Anton Ershov, Natalia Kartashkina, Viktoria Grikh, Valerii Smirnov, Galina Ramenskaya, Alexander Yatskovskiy, Igor Meglinski   +12 more
wiley   +1 more source