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Ion Channels in Small Cells and Subcellular Structures Can Be Studied with a Smart Patch-Clamp System
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Ion Channels in Small Cells and Subcellular Structures Can Be Studied with a Smart Patch-Clamp System
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Journal Article
Ion Channels in Small Cells and Subcellular Structures Can Be Studied with a Smart Patch-Clamp System
2002
Overview
We have developed a scanning patch-clamp technique that facilitates single-channel recording from small cells and submicron cellular structures that are inaccessible by conventional methods. The scanning patch-clamp technique combines scanning ion conductance microscopy and patch-clamp recording through a single glass nanopipette probe. In this method the nanopipette is first scanned over a cell surface, using current feedback, to obtain a high-resolution topographic image. This same pipette is then used to make the patch-clamp recording. Because image information is obtained via the patch electrode it can be used to position the pipette onto a cell with nanometer precision. The utility of this technique is demonstrated by obtaining ion channel recordings from the top of epithelial microvilli and openings of cardiomyocyte T-tubules. Furthermore, for the first time we have demonstrated that it is possible to record ion channels from very small cells, such as sperm cells, under physiological conditions as well as record from cellular microstructures such as submicron neuronal processes.
Publisher
Elsevier Inc,Biophysical Society
Subject
/ Cells
/ Epithelial Cells - physiology
/ Epithelial Cells - ultrastructure
/ Feedback
/ Intracellular Membranes - physiology
/ Intracellular Membranes - ultrastructure
/ Ion Channels - ultrastructure
/ Ions
/ Male
/ Membrane Potentials - physiology
/ Microscopy, Scanning Probe - instrumentation
/ Microscopy, Scanning Probe - methods
/ Myocytes, Cardiac - physiology
/ Myocytes, Cardiac - ultrastructure
/ Patch-Clamp Techniques - instrumentation
/ Patch-Clamp Techniques - methods
/ Rats
