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Patch Clamp

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Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping

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Adapting the Quesant Nomad atomic force microscope for biology and patch-clamp atomic force microscopy.

S Besch¹, K V Snyder, P C Zhang

¹Huges Center for Single Molecule Biophysics, Physiology and Biophysical Sciences, SUNY at Buffalo, Buffalo, NY 14214, USA.

Cell Biochemistry and Biophysics

|January 13, 2004

Summary

A modified atomic force microscope (AFM) enables reliable patch-clamp measurements for biological studies. This enhanced AFM system achieves high sensitivity, allowing detailed analysis of cellular responses.

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Area of Science:

Biophysics
Cell Biology
Instrumentation

Background:

Atomic Force Microscopy (AFM) is a powerful tool for nanoscale imaging and force measurements.
Patch-clamp electrophysiology is crucial for studying ion channel function and cellular electrical activity.
Integrating AFM with patch-clamp techniques presents challenges in biological applications due to noise and biocompatibility.

Purpose of the Study:

To modify an existing atomic force microscope (AFM) for reliable patch-clamp applications in demanding biological research.
To develop a system capable of simultaneous AFM imaging and patch-clamp recordings.
To achieve high sensitivity and low noise levels for precise measurement of cellular responses.

Main Methods:

Modification of a Quesant Nomad AFM, including biologically inert scan head and integrated optics for Köhler illumination.
Development of specialized software for automated gentle approach, force feedback, X-Y positioning, and force-distance curve measurements.
Implementation of a bevel-cut scan head for patch-clamp pipette clearance and a removable cantilever attachment system.

Main Results:

The modified patch-clamp AFM achieved low noise levels of 600 fA (3 kHz bandwidth) and 1 µA RMS (10 kHz bandwidth).
Simultaneous AFM imaging and patch-clamp recordings were successfully performed.
The system enabled measurement of sub-Angstrom, sub-millisecond electromotile responses in cells through correlated electrical and mechanical data.

Conclusions:

The developed patch-clamp AFM is a reliable and sensitive tool for advanced biological applications.
The integration of AFM and patch-clamp techniques provides a powerful platform for studying cellular electrophysiology and mechanics.
This enhanced system facilitates detailed investigation of cellular dynamics and responses at the nanoscale.