4.4 Article

Redundancy and multifunctionality among spinal locomotor networks

期刊

JOURNAL OF NEUROPHYSIOLOGY
卷 124, 期 5, 页码 1469-1479

出版社

AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.00338.2020

关键词

c-Fos; FosTRAP; multifunctionality; redundancy; spinal cord

资金

  1. UCLA Clinical and Translational Science Institute through National Institutes of Health Grant [UL1TR000124]
  2. Broccoli Foundation
  3. Nanette and Burt Forester, Be13ve inMiracles Foundation
  4. PwC

向作者/读者索取更多资源

c-Fos is used to identify system-wide neural activation with cellular resolution in vivo. However, c-Fos can only capture neural activation of one event. Targeted recombination in active populations (TRAP) allows the capture of two different c-Fos activation patterns in the same animal. So far, TRAP has only been used to examine brain circuits. This study uses TRAP to investigate spinal circuit activation during resting and stepping, giving novel insights of network activation during these events. The level of colabeled (c-Fos+ and TRAP+) neurons observed after performing two bouts of stepping suggests that there is a probabilistic-like phenomenon that can recruit many combinations of neural populations (synapses) when repetitively generating many step cycles. Between two 30min bouts of stepping, each consisting of thousands of steps, only similar to 20% of the neurons activated from the first bout of stepping were also activated by the second bout. We also show colabeling of interneurons that have been active during stepping and resting. The use of the FosTRAP methodology in the spinal cord provides a new tool to compare the engagement of different populations of spinal interneurons in vivo under different motor tasks or under different conditions. NEW & NOTEWORTHY The results are consistent with there being an extensive amount of redundancy among spinal locomotor circuits. Using the newly developed FosTRAP mouse model, only similar to 20% of neurons that were active (labeled by Fos-linked tdTomato expression) during a first bout of 30-min stepping were also labeled for c-Fos during a second bout of stepping. This finding suggests variability of neural networks that enables selection of many combinations of neurons (synapses) when generating each step cycle.

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