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Related Experiment Videos

"Nanosized voltmeter" enables cellular-wide electric field mapping.

Katherine M Tyner1, Raoul Kopelman, Martin A Philbert

  • 1Toxicology Program and Chemistry Department, University of Michigan, Ann Arbor, Michigan 48105, USA.

Biophysical Journal
|May 22, 2007
PubMed
Summary
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A novel photonic voltmeter allows unprecedented 3D mapping of intracellular electric fields throughout living cells. This reveals the complex, heterogeneous nature of the cytoplasm, challenging previous homogeneous models.

Area of Science:

  • Cellular Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Previous intracellular electric field (E field) measurements were limited to cell membranes (<0.1% of cell volume).
  • Existing membrane-dependent techniques require extensive cell-specific calibration.
  • The cellular cytoplasm is often simplified as a homogeneous solution in electrical models.

Purpose of the Study:

  • To introduce a novel nanodevice for comprehensive intracellular E field mapping.
  • To overcome limitations of existing membrane-bound measurement techniques.
  • To investigate the three-dimensional E field distribution within living cells.

Main Methods:

  • Development of a 30-nm "photonic voltmeter" for intracellular measurements.
  • External calibration of the nanodevice, enabling universal application.

Related Experiment Videos

  • Three-dimensional E field profiling throughout the entire volume of living cells.

    • Main Results:

    • Demonstrated the first complete 3D E field profiling within living cells.
    • Observed that mitochondrial E fields penetrate deeper into the cytosol than previously thought.
    • Provided evidence against the homogeneous electrical model of the cytoplasm.

    Conclusions:

    • The new photonic voltmeter enables accurate, cell-wide intracellular E field measurements.
    • The cell's cytoplasm exhibits complex electrical heterogeneity with distinct microdomains.
    • This finding necessitates revised electrical models for cellular function and dynamics.