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Related Experiment Video

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Author Spotlight: Microglia Research on Spinal Cord Heterogeneity and Purification
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Scratching activates microglia in the mouse spinal cord.

Ying Zhang1, Siok L Dun, Yi-Hung Chen

  • 1Department of Pharmacology, Temple University School of Medicine, Philadelphia, Pennsylvania; Department of Pathophysiology, Kunming Medical University, Kunming, China.

Journal of Neuroscience Research
|October 31, 2014
PubMed
Summary

Scratching activates spinal cord microglia, indicated by increased CD11b expression, following pruritogen injection. This microglial activation, along with phospho-p38 upregulation, is reduced by nalfurafine, a κ-opioid receptor agonist.

Keywords:
GNTIcompound 48/80gliaitchnalfurafinep38phospho-p38

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Area of Science:

  • Neuroscience
  • Immunology
  • Pruritogen Research

Background:

  • Repetitive scratching is a common symptom of various skin conditions.
  • The role of spinal cord microglial activation in itch-scratch behavior is not fully understood.

Purpose of the Study:

  • To investigate the hypothesis that scratching induced by pruritogens activates microglial cells in the mouse spinal cord.
  • To examine the expression of microglial markers and associated signaling pathways during scratching behavior.

Main Methods:

  • Immunohistochemistry was used to detect cluster determinant 11b (CD11b), a microglial marker, in mouse spinal cords.
  • Western blotting was employed to quantify CD11b and phospho-p38 (p-p38) expression levels.
  • Mice were injected with pruritogens (compound 48/80 or GNTI) or saline, with or without nalfurafine pretreatment.

Main Results:

  • Subcutaneous injection of compound 48/80 or GNTI significantly upregulated CD11b expression in the spinal cord within 10-30 minutes, indicating microglial activation.
  • Western blot analysis confirmed increased CD11b levels peaking at 30 minutes post-injection.
  • Phospho-p38 (p-p38) levels also increased in parallel with CD11b, and nalfurafine pretreatment suppressed both CD11b and p-p38 upregulation.

Conclusions:

  • Scratch behavior induced by compound 48/80 and GNTI is associated with parallel activation of spinal cord microglial cells.
  • The findings suggest a role for microglial activation and p38 MAPK signaling in the spinal cord's response to pruritogens.
  • Nalfurafine, a κ-opioid receptor agonist, effectively suppresses this pruritogen-induced microglial activation.