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Multiple retrograde tracing methods compatible with 3DISCO clearing.

Shuai Han1, Dongdong Li1, Yuhui Kou1

  • 1Department of Trauma and Orthopedics, Peking University People's Hospital, Beijing, China.

Artificial Cells, Nanomedicine, and Biotechnology
|November 13, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method combining neuroanatomy tracing and optical clearing to visualize multiple spinal motor neuron pools simultaneously. This technique provides a comprehensive 3D view of motor neuron organization within the spinal cord.

Keywords:
Motor neuronsoptical tissue clearingretrograde tracingspinal cord

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Area of Science:

  • Neuroscience
  • Spinal Cord Anatomy
  • Motor Neuron Research

Background:

  • Understanding the spatial organization of spinal motor neuron pools is essential but challenging due to the complexity of the spinal cord.
  • Previous methods using single-labeling and sectioning limited the observation to one motor neuron pool per specimen and prevented intact-tissue analysis.

Purpose of the Study:

  • To develop and validate a multiple retrograde tracing method compatible with 3DISCO optical clearing for simultaneous visualization of multiple spinal motor neuron pools.
  • To overcome the limitations of previous techniques and provide a holistic, three-dimensional view of motor neuron pool organization.

Main Methods:

  • A novel multiple retrograde tracing technique was combined with the 3DISCO optical clearing method.
  • Four different fluorescent tracers (Fluoro-Gold, Fluoro-Ruby, Cholera Toxin Subunit B, Alexa Fluor 488 and 647 Conjugate) were injected into the hindlimbs of adult C57BL/6 mice.
  • Spinal cords were optically cleared using 3DISCO and imaged with a confocal microscope to reconstruct a three-dimensional model.

Main Results:

  • The developed method successfully labeled four distinct motor neuron pools targeting injected hindlimb muscles.
  • Positive signals for all four tracers were detected, confirming the efficacy of the multiple labeling approach.
  • A three-dimensional model of the four motor neuron pools was reconstructed, revealing their spatial relationships within the spinal cord.

Conclusions:

  • This study presents the first simultaneous delineation of the spatial relationship between four different motor neuron pools targeting skeletal muscles within a single spinal cord.
  • The combined neuroanatomical tracing and optical clearing technique offers a powerful tool for a holistic understanding of spinal motor neuron organization.
  • This advanced method overcomes previous limitations, enabling intact-tissue, multi-pool visualization for comprehensive spinal cord research.