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Related Concept Videos

Gap Junctions01:37

Gap Junctions

55.7K
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Gap Junctions01:27

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another  cell. These cell junctions are classified  into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight...
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Contact-dependent Signaling01:19

Contact-dependent Signaling

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
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Patch Clamp01:18

Patch Clamp

6.0K
Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

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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...
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Related Experiment Video

Updated: Nov 11, 2025

Single-cell Microinjection for Cell Communication Analysis
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Single-cell Microinjection for Cell Communication Analysis

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Approaches to Study Gap Junctional Coupling.

Jonathan Stephan1, Sara Eitelmann1, Min Zhou2

  • 1Institute of Neurobiology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

Frontiers in Cellular Neuroscience
|March 29, 2021
PubMed
Summary

Glial cells form interconnected networks for brain function. This study presents methods to analyze these networks, revealing how cell differences impact communication and ion flow.

Keywords:
astrocyte syncytial isopotentialitypaired recordingspatch clamptracer couplingwide field imaging

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Electrophysiology

Background:

  • Astrocytes and oligodendrocytes are crucial glial cells supporting brain functions like homeostasis and signal transmission.
  • These glial cells form interconnected networks (syncytia) via connexin-based gap junctions, enabling intercellular communication.
  • Glial network connectivity is heterogeneous across brain regions, affecting electrical signaling and ion distribution.

Purpose of the Study:

  • To present accessible methods for analyzing gap junctional communication in glial networks.
  • To investigate how cellular heterogeneity influences electrical communication and ion spread within the brain.
  • To understand the contribution of glial cell properties to overall neuronal function.

Main Methods:

  • Paired recordings between glial cells.
  • Determination of syncytial isopotentiality.
  • Fluorescent tracer coupling and network topography analysis.
  • Wide-field imaging of ion-sensitive dyes.

Main Results:

  • Demonstrated methods reveal cellular heterogeneity in glial networks.
  • Identified electrical isolation of functional circuits due to cell differences.
  • Showed reduced ion transfer between different glial cell types.
  • Revealed anisotropy in tracer coupling within glial networks.

Conclusions:

  • The presented electrophysiological and imaging techniques are valuable for studying glial networks.
  • Glial network heterogeneity significantly impacts intercellular communication and ion dynamics.
  • Understanding glial cell properties is essential for comprehending their role in neuronal function.