Related Experiment Video

Updated: Jun 9, 2026

Visualizing Shifts on Neuron-Glia Circuit with the Calcium Imaging Technique
11:41

Visualizing Shifts on Neuron-Glia Circuit with the Calcium Imaging Technique

Published on: April 8, 2022

Calcium-activated potassium channels BK and IK1 are functionally expressed in human gliomas but do not regulate cell

Iskandar F Abdullaev1, Alena Rudkouskaya, Alexander A Mongin

  • 1Center for Neuropharmacology and Neuroscience, Albany Medical College, Albany, New York, United States of America.

Plos One
|September 3, 2010
PubMed

Insights

Calcium-activated potassium channels do not significantly impact glioma cell proliferation. Pharmacological inhibitors showed antiproliferative effects likely due to off-target actions, not direct channel inhibition in these brain tumor cells.

Area of Science:

  • Neuroscience
  • Oncology
  • Molecular Biology

Background:

  • Gliomas are aggressive brain tumors with poor treatment outcomes.
  • Calcium-activated potassium channels (KCa) have been implicated in tumor cell proliferation, but their role in gliomas is debated.

Purpose of the Study:

  • To investigate the expression and functional role of Ca(2+)-activated K(+) channels in human glioblastoma cell proliferation.

Main Methods:

  • Quantitative RT-PCR to detect KCa channel transcripts (BK, IK1, SK2).
  • Whole-cell electrophysiology to confirm functional expression of BK and IK1 channels.
  • Pharmacological inhibition and siRNA-mediated gene silencing of KCa channels.
  • Cell proliferation assays.

Main Results:

  • Transcripts for BK, IK1, and SK2 channels were detected in glioblastoma cells.
  • BK and IK1 channels were functionally expressed, while SK2 was not implicated.
  • Pharmacological inhibitors of BK and IK1 reduced proliferation, but at high concentrations.
  • siRNA knockdown of BK and IK1 channels did not affect glioma cell proliferation rates.

Conclusions:

  • Ca(2+)-activated K(+) channels do not play a critical role in the proliferation of human glioma cells.
  • Observed antiproliferative effects of channel inhibitors are likely due to off-target actions rather than direct channel blockade.

More Related Videos

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes10:19

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes

Published on: January 10, 2011

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)11:19

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)

Published on: September 26, 2015

Related Concept Videos

Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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.
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...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...