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Ion Channels01:19

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Single-Cell Calcium Imaging for Studying the Activation of Calcium Ion Channels
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Imaging with Ion Channels.

Cheng Zhu1, Kaixiang Huang1, Yunong Wang1

  • 1Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States.

Analytical Chemistry
|March 24, 2021
PubMed
Summary
This summary is machine-generated.

Researchers integrated gated ion channels into scanning ion conductance microscopy (SICM) probes. This novel platform enables spatial sensing at interfaces by detecting local electric field gradients using TRPV1 channels.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Surface Science

Background:

  • Scanning ion conductance microscopy (SICM) is a powerful technique for nanoscale imaging.
  • Gated ion channels offer precise molecular sensing capabilities.
  • Integrating biosensors with microscopy enhances spatial resolution and functional information.

Purpose of the Study:

  • To develop a robust platform for spatial information collection at interfaces using gated ion channels.
  • To demonstrate the feasibility of using voltage-gated ion channels as sensors in SICM.
  • To establish a generalizable approach for imaging applications with ion channel-based probes.

Main Methods:

  • Utilized a dual-barrel pipet for SICM probe positioning and ion channel housing.
  • Incorporated voltage-gated transient receptor potential vanilloid 1 (TRPV1) channels in a sniffer-patch configuration.
  • Developed scanning routines and automated signal analysis for ion channel activation detection.

Main Results:

  • Successfully demonstrated spatially resolved sensing using TRPV1 channels in SICM.
  • Imaged a porous membrane, detecting local electric field gradients at pores.
  • Showcased activation of TRPV1 channels by transmembrane potential-induced electric fields near pores.

Conclusions:

  • Gated ion channels can be effectively incorporated into SICM probes for advanced imaging.
  • This approach provides a robust platform for collecting spatial information at interfaces.
  • The demonstrated methodology is generalizable for various imaging applications utilizing ion channel sensors.