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We enhanced scanning electrochemical microscopy (SECM) for high-resolution single-cell metabolite imaging. This hybrid SECM-SICM system simultaneously captures cell topography and chemical release, enabling new insights into cellular processes.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Analytical Chemistry

Background:

  • Scanning electrochemical microscopy (SECM) is a valuable technique for measuring cellular metabolites.
  • Improving resolution in SECM is crucial for single-cell analysis.
  • Simultaneous measurement of cell topography and chemical activity is highly desirable.

Purpose of the Study:

  • To enhance the resolution of SECM for single-cell imaging.
  • To develop a hybrid system combining SECM with scanning ion conductance microscopy (SICM).
  • To demonstrate the capability of the hybrid system for analyzing cellular chemical release and topography.

Main Methods:

  • Miniaturization of microelectrodes for improved SECM resolution.
  • Integration of SECM with scanning ion conductance microscopy (SICM) using nanopipettes.
  • Simultaneous imaging of chemical concentration profiles and cell surface topography.
  • Application to PC12 cells for neurotransmitter release detection.
  • Intracellular detection of reactive oxygen species (ROS) using nanoscale electrodes.

Main Results:

  • Achieved high-resolution single-cell imaging using the improved SECM.
  • Successfully developed and implemented a hybrid SECM-SICM system.
  • Demonstrated simultaneous imaging of chemical substances and cell topography.
  • Measured neurotransmitter release from PC12 cells.
  • Successfully performed intracellular chemical detection, including ROS measurement.

Conclusions:

  • The hybrid SECM-SICM system offers simultaneous, high-resolution imaging of cellular chemical release and topography.
  • This advanced technique provides novel insights into cellular metabolism and function.
  • Nanoscale electrodes are effective for both extracellular and intracellular chemical analysis.