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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.

The Role of Ion Channels in Neuronal Computation

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.

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.

Electrochemical Gradient and Channel Proteins: An Overview

Electrochemical Gradient and Channel Proteins: An Overview

An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...

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: Jul 17, 2026

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

Single channels and ionic currents in peptidergic nerve terminals.

J R Lemos, J J Nordmann, I M Cooke

|January 5, 1986

Summary

Researchers analyzed ionic currents in isolated nerve terminals from a crustacean sinus gland. They identified novel sodium (Na+) and calcium (Ca2+) activated channels crucial for neurohormone secretion.

Area of Science:

Neuroscience
Cell Biology
Biophysics

Background:

Control of secretion involves membrane depolarization and calcium (Ca2+) entry.
Direct analysis of nerve terminal ionic currents is challenging due to their small size and inaccessibility.

Purpose of the Study:

To extend patch-clamp analysis to isolated peptidergic nerve terminals.
To characterize membrane ionic currents and their influence on secretion in these terminals.

Main Methods:

Utilized whole-terminal voltage clamp and single-channel recordings.
Applied patch-clamp techniques to isolated nerve terminals from a crustacean neurohaemal organ (sinus gland).

Main Results:

Identified inward currents carried by sodium (Na+) and Ca2+, and outward currents primarily by potassium (K+).

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Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Published on: December 24, 2013

Isolating and Culturing Vestibular and Spiral Ganglion Somata from Neonatal Rodents for Patch-Clamp Recordings

Isolating and Culturing Vestibular and Spiral Ganglion Somata from Neonatal Rodents for Patch-Clamp Recordings

Published on: April 21, 2023

Related Experiment Videos

Last Updated: Jul 17, 2026

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Published on: December 24, 2013

Isolating and Culturing Vestibular and Spiral Ganglion Somata from Neonatal Rodents for Patch-Clamp Recordings

Isolating and Culturing Vestibular and Spiral Ganglion Somata from Neonatal Rodents for Patch-Clamp Recordings

Published on: April 21, 2023

Discovered two novel single-channel currents, showing low selectivity between Na+ and K+, activated by intracellular Na+ or Ca2+ respectively.

Determined channel conductances of 69 and 213 pS in symmetrical 310 mM KCl.

Conclusions:

Established the feasibility of analyzing electrical activity and secretion from isolated neuronal terminals.
Provides a foundation for comparing intracellular recordings with whole-cell and single-channel currents in relation to peptide neurohormone release.