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Three functionally distinct classes of C-fibre nociceptors in primates
Matthew Wooten1, Hao-Jui Weng2, Timothy V Hartke1
1Department of Neurosurgery, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21287, USA.
Nature Communications
|June 21, 2014
Summary
Primate C-fibre polymodal nociceptors are functionally distinct. Quickly conducting (QC) and slowly conducting (SC) fibers show unique responses to heat, chemicals like beta-alanine, and histamine, differentiating pain and itch pathways.
Area of Science:
- Neuroscience
- Sensory Biology
- Primate Physiology
Background:
- C-fibre polymodal nociceptors in primates are classified by mechanosensitivity.
- Understanding these classifications is crucial for deciphering pain and itch signaling.
Purpose of the Study:
- To investigate functional differences between quickly conducting (QC) and slowly conducting (SC) mechanically sensitive polymodal nociceptors in primates.
- To characterize the chemosensitivity and response patterns of different C-fibre subtypes.
Main Methods:
- Utilized capsaicin and beta-alanine application to assess C-fibre responses.
- Performed intradermal injections and calcium imaging in primate dorsal root ganglion.
- Analyzed responses to mild burns, heat sensitization, and conductive properties.
Main Results:
- QC nociceptors vigorously responded to capsaicin and beta-alanine, unlike SC nociceptors.
- Mechanically insensitive C-fibres (C-MIAs) showed distinct responses to capsaicin and histamine.
- Calcium imaging confirmed beta-alanine and histamine activate separate capsaicin-responsive neuron populations.
Conclusions:
- Primate polymodal nociceptive afferents comprise at least three distinct functional subpopulations.
- Beta-alanine responsive QC fibres may correspond to murine MrgprD-expressing, non-peptidergic nociceptors.
- Histamine-induced itch and capsaicin-induced pain are likely peripherally encoded in C-MIAs.
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