Related Experiment Video
Updated: Sep 6, 2025

Proteomics to Identify Proteins Interacting with P2X2 Ligand-Gated Cation Channels
Published on: May 18, 2009
Using Symmetrical Organic Cation Solutions to Study P2X7 Ion Permeation
Kate Dunning1, Laurie Peverini2, Thomas Grutter3,4,5
1Centre National de la Recherche Scientifique, University of Strasbourg, CAMB UMR 7199, Strasbourg, France.
P2X7 receptors form unique macropores permeable to large molecules. Symmetrical organic cation solutions offer a clearer method to study these permeation properties, overcoming artifact-prone techniques.
Area of Science:
- Ion channel biophysics
- Molecular and cellular physiology
Background:
- P2X7 receptors are ATP-gated ion channels known for unique macropore formation.
- This macropore formation allows passage of large molecules (up to 900 Da), a key feature of the P2X family.
- The precise molecular mechanism of P2X7 macropore formation remains poorly understood, with traditional methods susceptible to artifacts.
Purpose of the Study:
- To discuss the permeation properties of P2X7 receptors.
- To highlight the methodological challenges in studying P2X7 permeation.
- To introduce symmetrical organic cation solutions as a superior technique for probing P2X7 permeation.
Main Methods:
- Review of existing literature on P2X7 receptor function and permeation.
- Analysis of artifacts associated with traditional electrophysiological methods under asymmetric ionic conditions.
- Application of symmetrical organic cation solutions to study P2X7 permeation properties.
Main Results:
- P2X7 receptors exhibit cation permeability and large molecule passage via macropores.
- Traditional electrophysiology methods can introduce artifacts due to ionic concentration changes.
- Symmetrical organic cation solutions provide a more reliable approach to assess P2X7 permeation.
Conclusions:
- Understanding P2X7 receptor permeation is crucial for elucidating its cellular roles.
- Methodological rigor is essential to accurately study P2X7 channel function.
- Symmetrical organic cation solutions represent a valuable advancement for P2X7 research.
More Related Videos
08:06Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
11:47Real-time Live-cell Flow Cytometry to Investigate Calcium Influx, Pore Formation, and Phagocytosis by P2X7 Receptors in Adult Neural Progenitor Cells
Published on: April 3, 2019
Related Concept Videos
Pore Transport and Ion-Pair Transport
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Ion Channels
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
The Resting Membrane Potential
Potentiometry: Membrane Electrodes
Non-gated Ion Channels
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
Ion Exchange