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Related Concept Videos

Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
The Role of Ion Channels in Neuronal Computation01:19

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.
Non-gated Ion Channels01:24

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.
Non-gated Ion Channels01:24

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.
Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

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...

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Related Experiment Video

Updated: Jun 19, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
10:08

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting

Published on: December 9, 2022

[Ca(2+)-dependent potassium channels play important roles in regulatory volume decrease in human nasopharyngeal

Shu-Tong He1, Lin-Yan Zhu, Lin-Jie Yang

  • 1Department of Physiology, Medical College of Jinan University, Guangzhou 510632, China.

Sheng Li Xue Bao : [Acta Physiologica Sinica]
|October 23, 2009
PubMed
Summary
This summary is machine-generated.

Calcium-dependent potassium channels are key to cell volume regulation in human nasopharyngeal carcinoma cells during hypotonic stress. These channels facilitate regulatory volume decrease (RVD) by managing potassium currents and cell swelling.

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Screening Ion Channels in Cancer Cells
06:19

Screening Ion Channels in Cancer Cells

Published on: June 16, 2023

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Last Updated: Jun 19, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
10:08

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting

Published on: December 9, 2022

Screening Ion Channels in Cancer Cells
06:19

Screening Ion Channels in Cancer Cells

Published on: June 16, 2023

Area of Science:

  • Cell Biology
  • Ion Channel Physiology
  • Cancer Cell Research

Background:

  • Cell volume regulation is crucial for cellular functions.
  • Volume-activated chloride channels are known to be involved in cell volume control.
  • The specific role of potassium channels in human nasopharyngeal carcinoma cell volume regulation requires further elucidation.

Purpose of the Study:

  • To investigate the role of various potassium channels in regulatory volume decrease (RVD) in CNE-2Z cells.
  • To understand the contribution of potassium currents to cell volume regulation under hypotonic conditions.

Main Methods:

  • Whole-cell patch clamp technique to record potassium currents.
  • Time-lapse imaging to monitor and analyze cell volume changes.
  • Application of hypotonic solutions (160 mOsm/L) and specific channel blockers (clotrimazole, 4-AP).

Main Results:

  • Hypotonic solution induced cell swelling (144.5+/-4.2%) and activated potassium currents (59.2 pA/pF at 92 mV), leading to RVD (48.9+/-4.6% recovery in 20 min).
  • Clotrimazole, a calcium-dependent potassium channel blocker, significantly inhibited potassium current (98.5+/-2.8%) and RVD (89.3+/-4.9%).
  • Extracellular calcium depletion abolished potassium current activation and inhibited RVD; 4-AP partially inhibited potassium currents (66.6+/-5.3%).

Conclusions:

  • Calcium-dependent potassium channels are the primary component of volume-activated potassium channels in CNE-2Z cells, playing a vital role in their volume regulation.
  • Voltage-gated potassium channels also contribute partially to the volume-activated potassium current.
  • These findings highlight the importance of specific potassium channel subtypes in maintaining cell volume homeostasis in cancer cells.