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Ion Channels

Ion Channels

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...

Stomach pH Regulation

Stomach pH Regulation

The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...

Non-gated Ion Channels

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.

Mechanically-gated Ion Channels

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...

Non-gated Ion Channels

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.

Mechanically-gated Ion Channels

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...

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Related Experiment Video

Updated: Jun 28, 2026

Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor

Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor

Published on: February 10, 2014

Acid-sensitive ion channels in gastrointestinal function.

¹Department of Experimental and Clinical Pharmacology, University of Graz, Universitätsplatz 4, A-8010 Graz, Austria. peter.holzer@uni-graz.at

Current Opinion in Pharmacology

|December 4, 2003

Summary

This summary is machine-generated.

Multiple acid sensors monitor extracellular pH changes. Different sensors like acid-sensing ion channels, TRPV1, P2X ion channels, and TASK channels respond to varying levels of acidosis, impacting gastrointestinal functions.

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Last Updated: Jun 28, 2026

Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor

Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor

Published on: February 10, 2014

In vitro Functional Characterization of Mouse Colorectal Afferent Endings

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Published on: January 21, 2015

Whole Cell Electrophysiology of Primary Cultured Murine Enterochromaffin Cells

Whole Cell Electrophysiology of Primary Cultured Murine Enterochromaffin Cells

Published on: September 26, 2018

Area of Science:

Physiology
Neuroscience
Gastroenterology

Background:

Extracellular pH deviations are critical physiological signals.
Afferent neurons express various acid sensors involved in bodily functions.

Purpose of the Study:

To elucidate the roles of different acid sensors in physiological and pathological conditions.
To differentiate the activation mechanisms of various acid-sensing channels.

Main Methods:

The study reviews the known functions and activation properties of acid-sensing ion channels.
Analysis of transient receptor potential cation channels (TRPV1), ionotropic purinoceptor (P2X) channels (P2X2), and two-pore domain background K+ channels (TASK).

Main Results:

Acid-sensing ion channels activate with moderate acidification.
TRPV1 channels are gated by severe acidosis.
P2X and TASK channels modulate neuronal excitability in response to acidosis without direct signaling.

Conclusions:

These acid sensors are crucial for regulating acid secretion, foregut motility, and mucosal protection.
Understanding these sensors is vital for addressing gastrointestinal issues like inflammation, ischemia, and stasis.