Sodium Currents
Sodium Currents - Related Videos
08:56
Demonstration of Proteolytic Activation of the Epithelial Sodium Channel (ENaC) by Combining Current Measurements with Detection of Cleavage Fragments
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Cited by 4 •
2014
Proteolytic activation of the epithelial sodium channel (ENaC) heterologously expressed in Xenopus laevis oocytes can be demonstrated by combining current measurements with a biotinylation approach to investigate the appearance of ion channel cleavage products at the cell surface. Functionally important cleavage sites can be identified by using site-directed mutagenesis.
04:31
Testing Monosynaptic Connections Using Tetrodotoxin and Tetrodotoxin-Resistant Sodium Channels
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2025
This video demonstrates testing monosynaptic connections using a transgenic fly. The fly has tetrodotoxin-resistant sodium channels and red light-activated channels in its presynaptic neurons, which are optogenetically excited to transmit signals to postsynaptic neurons.
01:26
Regulation of Sodium and Potassium
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2024
The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP). Sodium Regulation Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
08:53
Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
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2018
This work presents a protocol for manufacture sodium tungstate and sodium molybdate microcapsules via bacteria and their corresponding nanoparticles.
07:28
Measurement of Bioelectric Current with a Vibrating Probe
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Cited by 15 •
2011
The manufacture, calibration and use of non-invasive vibrating probes to measure bioelectric current in various biological systems is described.
FAQs
Depolarization changes the membrane voltage until a threshold is reached, triggering rapid opening of voltage-gated sodium channels. Sodium ions then enter the cell because their electrochemical gradient favors inward movement. This process provides the early electrical change needed for signaling in excitable cells, including neurons and muscle cells.
Inactivation terminates the inward sodium current after channels have opened. By stopping continued sodium entry, it helps end the depolarizing phase and supports subsequent repolarization of the membrane. The timing between channel opening and inactivation is therefore important when analyzing action potentials and the kinetics of voltage-gated sodium channels.
Mutations or drugs can modify the behavior of voltage-gated sodium channels, which may alter sodium-current properties and the resulting electrical activity. Patch-clamp studies allow researchers to examine these changes by comparing channel kinetics and action potentials under different conditions. This approach connects altered channel function with disease research and channel-targeting therapies.
Patch-clamp electrophysiology records ionic currents associated with sodium-channel activity across a cell membrane. Researchers use these measurements to examine how currents develop during electrical stimulation and how rapidly channel opening and inactivation occur. The resulting recordings support detailed analysis of action potentials, channel kinetics, and changes caused by mutations or drugs.
Recordings can reveal how sodium-channel activity contributes to action-potential generation and electrical signaling. They also provide information about channel kinetics, including the relationship between rapid opening and later inactivation. In biology, these measurements help compare sodium-channel behavior in neurons, muscle cells, and other excitable tissues.
Sodium currents are central to electrical signaling in neurons and muscle cells, making them relevant to both nervous-system and cardiovascular studies. Research examining these currents contributes to understanding epilepsy, pain, and cardiac arrhythmias. Measurements also support investigation of therapies designed to target sodium channels and modify abnormal electrical activity.