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Related Experiment Videos

Neurotrophins and hyperalgesia.

X Q Shu1, L M Mendell

  • 1Department of Neurobiology and Behavior, State University of New York, Stony Brook, NY 11794, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 8, 1999
PubMed
Summary

Nerve growth factor (NGF) sensitizes sensory neurons, contributing to pain perception. This study investigates NGF

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Area of Science:

  • Neuroscience
  • Pain Research
  • Cell Biology

Background:

  • Nerve growth factor (NGF) is vital for nociceptive neuron survival and adult pain signaling.
  • NGF levels increase after inflammatory skin injury, causing rapid thermal hyperalgesia.
  • Mast cells are implicated in NGF's action, releasing substances like serotonin and histamine.

Purpose of the Study:

  • To investigate the direct effects of NGF on dorsal root ganglion (DRG) neurons.
  • To explore the role of NGF in sensitizing sensory neurons to heat stimuli.
  • To examine the acute effects of other neurotrophins, like brain-derived neurotrophic factor (BDNF), on nociceptive pathways.

Main Methods:

  • Culturing small-diameter dorsal root ganglion cells.
  • Assessing NGF's acute effects on capsaicin responses in DRG neurons.
  • Investigating the impact of trkB receptor ligands (BDNF, neurotrophin-4/5) on nociceptive afferents.

Main Results:

  • NGF acutely conditions capsaicin responses in DRG neurons, suggesting heat sensitization.
  • Ligands for the trkB receptor (BDNF, neurotrophin-4/5) acutely sensitize nociceptive afferents and induce hyperalgesia.
  • Histamine receptor blockade did not prevent NGF-induced hyperalgesia; serotonin receptor effects were complex.

Conclusions:

  • NGF directly sensitizes sensory neurons, potentially via the capsaicin receptor (VR1), contributing to heat hyperalgesia.
  • BDNF, upregulated after inflammation, may be a key peripheral mediator of neurotrophin-induced hyperalgesia.
  • NGF's role in adult pain involves direct neuronal sensitization and interaction with mast cell mediators.

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