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Site-dependent and state-dependent inhibition of pruritogen-responsive spinal neurons by scratching
- Source :
- European Journal of Neuroscience. 36:2311-2316
- Publication Year :
- 2012
- Publisher :
- Wiley, 2012.
-
Abstract
- The relief of itch by scratching is thought to involve inhibition of pruritogen-responsive neurons in the spinal cord. We recorded the responses of superficial dorsal horn neurons in mice to intradermal injection of the pruritogens chloroquine and histamine. Scratching within an area 5-17 mm distant from the injection site, outside of the units' mechanoreceptive fields (off-site), significantly inhibited chloroquine-evoked and histamine-evoked responses without affecting capsaicin-evoked firing. This is consistent with observations that scratching at a distance from a site of itch is antipruritic. In contrast, scratching directly at the injection site (within the receptive field; on-site) had no effect on chloroquine-evoked neuronal firing, but enhanced the same neurons' responses to intradermal injection of the algogen capsaicin. Moreover, neuronal responses to histamine were enhanced during on-site scratching, and this was followed by suppression of firing below baseline levels after termination of scratching. Scratching thus inhibits pruritogen-responsive neurons in a manner that depends on the input modality (i.e. pain vs. histamine-dependent or histamine-independent itch) and skin location.
- Subjects :
- integumentary system
General Neuroscience
Scratching
Spinal cord
eye diseases
chemistry.chemical_compound
medicine.anatomical_structure
nervous system
chemistry
Receptive field
Capsaicin
Anesthesia
medicine
Reflex
Intradermal injection
skin and connective tissue diseases
Posterior Horn Cell
Neuroscience
Histamine
Subjects
Details
- ISSN :
- 0953816X
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- European Journal of Neuroscience
- Accession number :
- edsair.doi...........e59a3c87295aff2fc353f8d0ee62f803