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Updated: May 24, 2026

Whole Cell Patch Clamp for Investigating the Mechanisms of Infrared Neural Stimulation

Whole Cell Patch Clamp for Investigating the Mechanisms of Infrared Neural Stimulation

Published on: July 31, 2013

Infrared light excites cells by changing their electrical capacitance.

Mikhail G Shapiro¹, Kazuaki Homma, Sebastian Villarreal

¹Department of Biochemistry and Molecular Biology, University of Chicago, 929 E. 57th Street, GCIS W244, Illinois 60637, USA.

Nature Communications

|March 15, 2012

Summary

Infrared light stimulates cells via a novel electrostatic mechanism involving water absorption and temperature changes. This discovery clarifies infrared nerve stimulation, paving the way for new medical therapies.

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Area of Science:

Biophysics
Neuroscience
Biomedical Engineering

Background:

Optical stimulation advances brain function studies and holds medical promise.
Pulsed infrared laser stimulation (>1.5 μm) can directly stimulate nerves/muscles without pre-treatment.
The mechanism of infrared stimulation remained unclear, limiting clinical translation.

Purpose of the Study:

To elucidate the underlying mechanism of infrared light-induced cellular excitation.
To demonstrate a novel, general electrostatic mechanism for infrared stimulation.
To support the clinical potential of infrared stimulation therapies.

Main Methods:

Investigated cellular responses to pulsed infrared laser stimulation.
Analyzed the role of water absorption and localized heating.
Examined changes in plasma membrane electrical capacitance.
Assessed the reversibility and fundamental requirements of the stimulation mechanism.

Main Results:

Infrared pulses are absorbed by water, causing rapid local temperature increases.
This heating reversibly alters plasma membrane capacitance, leading to cell depolarization.
The mechanism is general, relying only on basic cell membrane properties.
The process is fully reversible.

Conclusions:

Infrared light excites cells through a novel electrostatic mechanism driven by photothermal effects.
This mechanism explains the effectiveness of infrared stimulation for nerve and muscle activation.
Findings highlight the broad applicability and therapeutic potential of pulsed infrared stimulation.