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The Use of Magnetic Resonance Spectroscopy as a Tool for the Measurement of Bi-hemispheric Transcranial Electric Stimulation Effects on Primary Motor Cortex Metabolism

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Published on: November 19, 2014

Wireless magnetothermal deep brain stimulation.

Ritchie Chen¹, Gabriela Romero², Michael G Christiansen¹

¹Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)

|March 14, 2015

Summary

This summary is machine-generated.

Researchers developed wireless deep brain stimulation using magnetic nanoparticles to activate heat-sensitive neurons. This method enables remote, minimally invasive neural excitation for studying brain circuits and treating neurological disorders.

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Area of Science:

Neuroscience
Biotechnology
Materials Science

Background:

Deep brain stimulation (DBS) is crucial for studying brain circuits and treating neurological disorders.
Current DBS methods often require invasive implants and wired connections, limiting chronic applications.
Targeting specific neuronal populations remains a challenge in brain stimulation.

Purpose of the Study:

To demonstrate a novel, wireless method for neural excitation using magnetic nanoparticles.
To investigate the potential of magnetothermal activation of heat-sensitive neurons for deep brain stimulation.
To assess the feasibility of chronic, implant-free neural stimulation.

Main Methods:

Utilized magnetic nanoparticles that generate heat via hysteresis when exposed to alternating magnetic fields.
Activated the heat-sensitive capsaicin receptor TRPV1 using nanoparticle-generated heat for neural excitation.
Administered wireless magnetothermal stimulation in the ventral tegmental area of mice.
Monitored neuronal activity in targeted and projecting brain regions.

Main Results:

Successfully achieved remote and minimally invasive neural excitation through magnetothermal activation of TRPV1(+) neurons.
Demonstrated widespread and reversible neuronal firing in response to wireless stimulation.
Observed excitation in targeted ventral tegmental area neurons and their projection sites.
Confirmed nanoparticle persistence in the brain for over one month, enabling chronic stimulation.

Conclusions:

Wireless magnetothermal stimulation offers a promising approach for deep brain stimulation.
This technique allows for chronic, implant-free neural modulation.
The method facilitates the study of intact brain circuits and holds potential for treating neurological disorders.