Nanostimulation: manipulation of single neuron activity by juxtacellular current injection

Area of Science:

• Neuroscience
• Cellular Electrophysiology

Background:

• Single-neuron recording is common, but single-cell stimulation techniques are lacking.
• Existing methods are not easily applicable, hindering detailed study of neuronal function.

Purpose of the Study:

• To describe nanostimulation, a novel single-cell stimulation technique derived from juxtacellular labeling.
• To demonstrate the applicability and effectiveness of nanostimulation in mammalian brain research.

Main Methods:

• Utilized glass pipettes with specific DC resistance (4-7 Mohms) for juxtacellular configuration.
• Achieved high resistance (> or = 20 Mohms) indicating close neuronal contact.
• Applied nanoampere currents for neuronal activation, termed nanostimulation.

Main Results:

• Successfully activated neurons with controllable action potential (AP) frequency and number.
• Demonstrated selective inhibition of sensory responses in identified neurons.
• Provided evidence for cell-specific effects and selective single-neuron activation.

Conclusions:

• Nanostimulation is a practical and versatile technique for single-neuron manipulation in vivo.
• The method shows potential for advancing our understanding of neuronal contributions to behavior.
• Biophysical similarity to electroporation suggests membrane pore induction as the mechanism.