Ion Channel Expression
Ion Channel Expression - Related Videos
10:00
Controllable Ion Channel Expression through Inducible Transient Transfection
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Cited by 2 •
2017
Studying ion channels through a heterologously expressing system has become a core technique in biomedical research. In this manuscript, we present a time efficient method to achieve tightly controlled ion channel expression by performing transient transfection under the control of an inducible promoter.
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Ion Channels
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2019
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange. Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...
08:00
Patch Clamp Recording of Ion Channels Expressed in Xenopus Oocytes
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Cited by 12 •
2008
This is intended as an introduction to patch clamp recording from Xenopus laevis oocytes. It covers vitelline membrane removal, formation of a gigaohm seal (gigaseal), and the optional conversion of the patch to the outside-out topology.
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Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells
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Cited by 4 •
2010
We will demonstrate how to study the effect of a single point mutation on the function of an ion channel.
11:34
Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels
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Cited by 5 •
2013
Afferent sensory neurons signal sensory information from the periphery to the central nervous system. Identifying specific afferent neurons will help in understanding their physiology. We describe a method of retrograde labeling to identify afferent neurons, and study the voltage-gated ion channels in these neurons using patch clamp electrophysiology and immunocytochemistry.
FAQs
Several stages can change the functional result: gene transcription determines the initial RNA supply, translation produces channel subunits, and folding and assembly determine whether those subunits form usable proteins. Subsequent modification and trafficking influence stability and delivery. Examining these stages separately helps distinguish reduced production from faulty processing or inefficient arrival at the cell surface.
Producing a channel subunit does not ensure that a functional channel reaches the correct membrane. Folding gives the protein its usable structure, assembly combines subunits when required, and trafficking directs the processed protein to the plasma membrane or an intracellular compartment. Disruption at any point can change channel localization and therefore alter where ion movement affects cell behavior.
Expression controls how much channel protein is produced and where it is delivered, whereas channel gating determines when an available channel opens or closes. Gating may respond to voltage, ligands, or mechanical signals. Separating abundance, localization, and gating allows biological studies to ask whether altered ion movement reflects channel quantity, placement, or stimulus-dependent activity.
A useful investigation can follow the sequence from gene transcription and translation through folding, assembly, modification, and trafficking. The analysis should also identify whether channels are delivered to the plasma membrane or retained in intracellular compartments. Comparing these stages helps locate the point at which channel production, processing, or delivery changes the resulting cellular response.
These studies connect channel abundance and localization with electrical signaling, muscle contraction, secretion, and cellular homeostasis. The relevant outcome depends on where channels are delivered and how they respond to voltage, ligands, or mechanical signals. Consequently, expression analysis can link molecular changes in membrane proteins to broader changes in cellular function.
Changes in channel abundance or localization can disturb the movement of ions and contribute to disease-related cellular dysfunction. Measuring these changes helps investigators identify whether abnormal channel production, processing, or delivery is involved. Manipulating expression also supports the development of targeted therapies designed to address channel-related abnormalities rather than treating cellular effects without examining their molecular source.