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Related Concept Videos

Gap Junctions01:37

Gap Junctions

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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Related Experiment Video

Updated: Jun 13, 2026

A Functional Assay for Gap Junctional Examination; Electroporation of Adherent Cells on Indium-Tin Oxide
11:02

A Functional Assay for Gap Junctional Examination; Electroporation of Adherent Cells on Indium-Tin Oxide

Published on: October 18, 2014

Non-invasive microfluidic gap junction assay.

Sisi Chen1, Luke P Lee

  • 1Biomolecular Nanotechnology Center, Berkeley Sensor & Actuator Center, Department of Bioengineering, University of California-Berkeley, 408C Stanley Hall, CA 94720-1762, USA.

Integrative Biology : Quantitative Biosciences From Nano to Macro
|May 18, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a microfluidic platform to quantitatively measure gap junction communication and dye transfer. The system reveals effective diffusivity and reveals insights into the pharmacological inhibition of gap junctions.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Microfluidics

Background:

  • Gap junctions facilitate intercellular communication via ion and biomolecule exchange, crucial for cardiac and neuronal functions.
  • Existing methods for studying gap junction communication often yield unquantifiable data or are difficult to implement.
  • Quantitative analysis of gap junction dynamics is needed to understand cellular communication and drug effects.

Purpose of the Study:

  • To develop and utilize a quantitative microfluidic platform for measuring gap junction communication.
  • To determine the effective diffusivity of molecular transfer through gap junctions in C6 cells.
  • To investigate the efficacy of the gap junction blocker 18alpha-GA under varying conditions and assess recovery.

Main Methods:

  • Employing a microfluidic cell biology platform for quantitative measurement of dye spread.
  • Utilizing hydrodynamic focusing for selective dye loading (calcein/AM) of confluent cell layers.
  • Monitoring dye transfer dynamics via time-lapse fluorescent microscopy and analyzing pharmacological effects.

Main Results:

  • Measured effective diffusivity of calcein transfer in Cx43-expressing C6 cells as 3.4 x 10(-13) m(2)/s.
  • Demonstrated that 18alpha-GA is less effective in serum-containing media but highly effective (2.5 microM) in serum-free conditions.
  • Observed rapid resumption of dye spread within 1 minute after drug washout, indicating no effect on transcriptional regulation.

Conclusions:

  • The integrated microfluidic platform enables in situ monitoring of gap junction communication.
  • The study provides dynamic data on intercellular molecular transfer and pharmacological modulation of gap junctions.
  • Findings offer new insights into the conditions affecting gap junction blocker efficacy and recovery.