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Updated: Sep 6, 2025

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Spinal TRPA1 Contributes to the Mechanical Hypersensitivity Effect Induced by Netrin-1.

Hong Wei1, Liisa Ailanen2, Miguel Morales2

  • 1Department of Physiology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland.

International Journal of Molecular Sciences
|June 24, 2022
PubMed
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Netrin-1 induces mechanical pain hypersensitivity via spinal TRPA1 receptors and pronociceptive neurons. This finding offers insights into pain mechanisms and potential therapeutic targets for chronic pain conditions.

Keywords:
TRPA1 receptorsmechanical hypersensitivitymedullary pain control neuronnetrin-1spinal cord

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Area of Science:

  • Neuroscience
  • Pain Research
  • Molecular Biology

Background:

  • Netrin-1 and its receptor DCC are implicated in pain signaling.
  • The specific downstream receptors mediating netrin-1's pronociceptive effects remain unclear.

Purpose of the Study:

  • To investigate whether spinal TRPC4/C5 or TRPA1 channels mediate netrin-1-induced pain.
  • To explore the role of netrin-1 in modulating the activity of pain control neurons in the rostral ventromedial medulla (RVM).

Main Methods:

  • Intrathecal administration of netrin-1 and receptor antagonists in rats.
  • Behavioral assessment of mechanical and heat pain sensitivity.
  • Electrophysiological recordings of RVM neuron activity.

Main Results:

  • Netrin-1 induced dose-dependent mechanical hypersensitivity lasting up to three weeks, without affecting heat sensitivity.
  • TRPA1 antagonist attenuated netrin-1-induced hypersensitivity in both early and late phases.
  • Netrin-1 increased the activity of pronociceptive RVM ON-like neurons during the late phase.

Conclusions:

  • Spinal TRPA1 receptors are crucial for the maintenance of netrin-1-induced mechanical hypersensitivity.
  • Pronociceptive RVM ON-like neurons are involved in netrin-1's pain-promoting actions.
  • These findings highlight TRPA1 and RVM neurons as potential targets for managing netrin-1-related pain.