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Researchers developed magnetoelectric nanodiscs (MENDs) for remote neuromodulation. These MENDs enable precise control of brain activity and behaviors in mice, offering a less invasive alternative to deep brain stimulation.

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Area of Science:

  • Neuroscience
  • Materials Science
  • Biotechnology

Background:

  • Deep brain stimulation (DBS) is a crucial tool in neuroscience but involves invasive electrode implantation.
  • Less invasive neuromodulation techniques are needed to broaden the applications of brain stimulation.
  • Nanomaterials offer potential for remote modulation by converting magnetic fields into electrical signals.

Purpose of the Study:

  • To synthesize and characterize magnetoelectric nanodiscs (MENDs) for efficient magnetoelectric coupling.
  • To investigate the efficacy of MENDs in modulating neuronal activity via magnetic stimulation.
  • To demonstrate the in vivo application of MENDs for remote behavioral control in mice.

Main Methods:

  • Synthesis of core-double-shell Fe3O4-CoFe2O4-BaTiO3 magnetoelectric nanodiscs (MENDs).
  • In vitro neuronal cultures were decorated with MENDs and stimulated with magnetic fields.
  • In vivo studies involved injecting MENDs into specific brain regions (ventral tegmental area, subthalamic nucleus) of mice.
  • Behavioral responses (reward, motor control) were monitored following magnetic stimulation.

Main Results:

  • MENDs exhibited efficient magnetoelectric coupling and robust responses in decorated neurons.
  • Magnetic stimulation of MENDs induced neuronal activity even with sub-threshold individual particle potentials.
  • A model of repetitive subthreshold depolarization explained the observed in vitro and in vivo effects.
  • Remote control of reward and motor behaviors was achieved in mice by stimulating MENDs in targeted brain areas.

Conclusions:

  • Magnetoelectric nanodiscs (MENDs) provide a viable platform for remote, non-invasive neuromodulation.
  • MENDs enable precise control over neuronal activity and complex behaviors via external magnetic fields.
  • This technology holds promise for advancing neuroscience research and developing novel therapeutic strategies.