Related Experiment Video
Updated: Jun 15, 2025
11:07
In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
Published on: May 11, 2020
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Persistent inward currents in human motoneurons: emerging evidence and future directions
Ricardo N O Mesquita1,2,3, Janet L Taylor2,3, C J Heckman4
1Department of Electrical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
Journal of Neurophysiology
|August 28, 2024
Summary
Neuromodulators like serotonin and noradrenaline enhance persistent inward currents (PICs) in motoneurons, crucial for motor control. Understanding PIC modulation offers new avenues for improving movement in health and disease.
Area of Science:
- Neuroscience
- Motor Control Physiology
Background:
- Motoneuron excitability is modulated by serotonin and noradrenaline.
- These neuromodulators activate voltage-gated channels generating persistent inward currents (PICs).
- PICs are vital for initiating, accelerating, and sustaining motoneuron firing patterns.
Purpose of the Study:
- To review the role of PICs in motoneuron firing.
- To discuss methods for estimating PIC modulation in vivo.
- To present emerging evidence on PIC modulation in health and disease.
Main Methods:
- Review of existing literature on PICs and motoneuron firing.
- Description of techniques for estimating PICs in motoneurons.
- Synthesis of current findings on PIC modulation.
Main Results:
- Neuromodulators significantly influence motoneuron responses to synaptic input via PICs.
- Advancements in in vivo techniques allow for detailed examination of PIC modulation.
- PICs play a critical role in amplifying and prolonging synaptic effects on motoneurons.
Conclusions:
- PICs are key determinants of motoneuron firing and motor output.
- Understanding PIC modulation provides mechanistic insight into motor control.
- Further research into PIC physiology can lead to novel therapeutic strategies for motor disorders.
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