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Article | Voltage-Gated Na Channels
Michael Clerx, Paul G.A. Volders, Gary R. Mirams
We present variability in reported midpoints of activation and inactivation for the cardiac fast sodium current, INa, show the correlation between these midpoints, and discuss possible experimental sources of variability.
Article | Contractile Function
Matvey Pilagov, Sonette Steczina, Ateeqa Naim, Michael Regnier, Michael A. Geeves, Neil M. Kad
Single-molecule imaging provides a high spatial resolution of fluorescent ATP binding to myosin within cardiac myofibrils. This is used to determine how cMyBP-C affects the reserve of cardiac myosins used to modulate force. Here, we study PKA phosphorylation and a haploinsufficiency-causing mutation from human tissue.
Article
Joshua B. Holmes, Julian E. Stelzer
Danicamtiv and omecamtiv mecarbil are second- and first-generation myotropic sarcomere activators intended to treat patients with heart failure with reduced ejection fraction. This study directly compares the in vivo cardiac mechanisms to assess whether danicamtiv has improved upon the shortcomings of omecamtiv mecarbil.
Article
David Gong, Jennifer L. Orthmann-Murphy, Deepak Kumar, Gabriel D. Dungan, Ayman W. El-Hattab, Nicoline Schiess, Yun L. Luo, Mona M. Freidin, Charles K. Abrams
Gong et al. present two novel, disease-causing genetic variants of connexin 47. In vitro assays and MD simulations of these mutant proteins reveal unique mechanisms that relate connexin 47 mutations to severities of Pelizaeus–Merzbacher-like disease 1.
Article
Yu Zhou, Xiao-Ming Xia, Christopher J. Lingle
The role of BK S6 residues R329K330K331 and E321/E324 in β subunit–mediated inactivation is probed. WT R329K330K331 hinders inactivation in closed states, while RKK mutations stabilize inactivated states even under conditions where channels are otherwise closed. E321/E324 mutations do not permit closed-state inactivation.
Article | Contractile Function
Josè Manuel Pioner, Enrico Pierantozzi, Raffaele Coppini, Egidio Maria Rubino, Valentina Biasci, Giulia Vitale, Annunziatina Laurino, Lorenzo Santini, Marina Scardigli, Davide Randazzo, Camilla Olianti, Matteo Serano, Daniela Rossi, Chiara Tesi, Elisabetta Cerbai, Stephan Lange, Carlo Reggiani, Leonardo Sacconi, Corrado Poggesi, Cecilia Ferrantini, Vincenzo Sorrentino
Obscurin deletion in mice is linked to compensated dilated cardiomyopathy, reduced sarcoplasmic reticulum volume, T-tubule alterations, altered E-C coupling, impaired response to inotropic agents, and increased propensity to arrhythmias.
Article | Contractile Function
Seong-Won Han, Justin Kolb, Gerrie P. Farman, Jochen Gohlke, Henk L. Granzier
To store and preserve muscle function, glycerol is often used, but its effect on passive properties is unclear. Muscles stored in glycerol showed increased passive stress that persisted after thin filament removal, indicating a titin-specific mechanism. Glycerol storage should be avoided in passive stiffness studies.
Journal of General Physiology Cover Image for Volume 157, Issue 4
Current Issue
Volume 157,
Issue 4,
7 July 2025
Reviews & Opinions
Commentary | Voltage-Gated Na Channels
Colleen E. Clancy
The comprehensive meta-analysis from Clerx and coauthors challenges long-standing assumptions about data interpretation, data comparison, and electrophysiological data used to develop models.
Research News | Contractile Function
Ben Short
JGP study reveals that glycerol storage increases the titin-based stiffness of muscle fibers, suggesting that this commonly used method should be avoided by researchers interested in the passive properties of muscle.
Viewpoint | Voltage-Gated Na Channels
Peter Hull, Angelika Lampert
Metaphors shape how we communicate and understand science, from genetic blueprints to molecular gates. This article explores their role in the sodium channel fast inactivation mechanism.

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