Cited by 255Cannabis and Cannabinoid ResearchPain Mechanisms and TreatmentsNerve injury and regeneration

Peripheral nerve injury induces cannabinoid receptor 2 protein expression in rat sensory neurons

Wotherspoon, G., Fox, A., McIntyre, P., Colley, S., Bevan, S., Winter, J.·2005·Neuroscience

Abstract

We have localized cannabinoid receptor 2 protein in rat and mouse somatic sensory nervous system, using an antibody that recognizes mouse cannabinoid receptor 2. Little or no cannabinoid receptor 2 immunoreactivity was found in sections of naive rat or mouse dorsal root ganglia or spinal cord. This was in accord with the lack of detectable cannabinoid receptor 2 mRNA in (dorsal root ganglion) neurons by in situ hybridization experiments described in the literature. However, we could detect cannabinoid receptor 2 immunoreactivity following unilateral nerve damage-either by sciatic nerve section, or by spinal nerve ligation. It was localized to the superficial laminae of the dorsal horn of the spinal cord, ipsilateral to the nerve damage, coincident with the area of termination of damaged afferents which was marked by loss of isolectin B4 binding. This upregulation was not seen in cannabinoid receptor 2 null mice. The cannabinoid receptor 2 protein in spinal cord appeared to be expressed on sensory neuron afferent terminals as it colocalized with two markers of damaged afferents, namely growth associated protein-43 and the neuropeptide galanin. Moreover, it did not colocalize with markers of activated microglial cells (OX-42) or astroglial cells (glial fibrillary acidic protein) in rat spinal cord. In the peripheral nerve, accumulation of cannabinoid receptor 2 immunoreactivity was seen in nerve sections proximal, but not distal, to the ligation site, suggesting transport down the nerve from the cell bodies. Although convincing cannabinoid receptor 2 immunoreactivity was seen in neither uninjured nor injured dorsal root ganglion neuron cell bodies in tissue sections, expression was detectable in isolated, cultured neurons that had received a prior axotomy in vivo. This clear demonstration of CB(2) receptors on sensory neurons suggests an additional cellular target for CB(2) agonist induced analgesia, at least in neuropathic models.

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Crossref · 10.1016/j.neuroscience.2005.06.009

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Authors
Wotherspoon, G., Fox, A., McIntyre, P., Colley, S., Bevan, S., & Winter, J.
Affiliations
Novartis (Switzerland) (CH)
Corresponding author
Winter, J.
Venue
Neuroscience
Publisher
Elsevier BV
Published
2005-01
Volume
135
Issue
1
Pages
235-245
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2036912145
Cited by
251
References
47
Citations by year
2026: 2 · 2025: 1 · 2024: 3 · 2023: 6 · 2022: 11 · 2021: 10 · 2020: 9 · 2019: 9 · 2018: 10 · 2017: 9 · 2016: 11 · 2015: 6 · 2014: 16 · 2013: 14 · 2012: 11
FWCI
12.33
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (submittedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
Keywords
CB2 receptor, peripheral nerve injury, neuropathic pain, sensory neurons, dorsal root ganglia, dorsal horn, sciatic nerve section, spinal nerve ligation, axotomy, galanin, growth-associated protein 43
MeSH terms
Animals, Astrocytes, Ganglia, Spinal, Cricetinae, Immunohistochemistry, Ligation, Male, Mice, Inbred C57BL, Neurons, Afferent, Pain, Peripheral Nervous System Diseases, Spinal Cord, Spinal Nerves, CHO Cells, Rats, Wistar, Microglia, DNA Primers, Mice, Knockout, Receptor, Cannabinoid, CB2, Mice, Rats, Peripheral Nerve Injuries

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