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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes
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Probing action potentials of single beating cardiomyocytes using atomic force microscopy.

Jianjun Dong1,2, Bowei Wang1,2, Guoliang Wang1,2

  • 1International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology, Changchun 130022, China. 362053951@qq.com.

Analytical Methods : Advancing Methods and Applications
|July 29, 2024
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Summary
This summary is machine-generated.

This study introduces a nanoscale atomic force microscopy (AFM) method to precisely measure cardiomyocyte action potentials. This technique enables drug screening and disease research by analyzing cellular electrical activity at the single-cell level.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Cardiology

Background:

  • Electrophysiological studies of cardiomyocytes are crucial for understanding cardiac function and disease.
  • Existing methods for measuring action potentials often lack nanoscale resolution or the ability to study single beating cells.
  • Atomic force microscopy (AFM) offers high spatial resolution, but its application to dynamic cellular electrical activity is challenging.

Purpose of the Study:

  • To develop and validate a nanoscale method using AFM to probe action potentials of single beating cardiomyocytes.
  • To investigate the influence of indentation force on the tip-cell interface for reliable electrical measurements.
  • To demonstrate the feasibility of simultaneous electrophysiological and mechanical recordings of contracting cardiomyocytes.

Main Methods:

  • Utilized a conductive AFM tip as a nanoelectrode to record action potentials from self-beating cardiomyocytes.
  • Employed both non-constant and constant force contact modes for AFM measurements.
  • Developed an electrical model of the tip-cell interface and theoretically analyzed indentation force effects.
  • Leveraged AFM's force feedback for precise tip-cell contact control.

Main Results:

  • Successfully recorded nanoscale action potentials from single beating cardiomyocytes.
  • Demonstrated reliable measurements through precise control of tip-cell contact.
  • Showcased the feasibility of simultaneously acquiring action potential and force data during cardiomyocyte contraction.
  • Validated the method's utility by probing drug effects on action potentials.

Conclusions:

  • The developed AFM-based method provides a novel nanoscale approach for electrophysiological studies of single beating cardiomyocytes.
  • This technique is applicable to studying neurons, ion channels, and cellular responses to drugs.
  • It holds significant potential for disease state analysis and pharmaceutical drug testing and screening.