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Antinociception produced by capsaicin: spinal or peripheral mechanism?
A Dickenson1, N Ashwood, A F Sullivan
1Department of Pharmacology, University College, London, U.K.
European Journal of Pharmacology
|October 9, 1990
Summary
Capsaicin, a compound found in chili peppers, reduces pain signals in the spinal cord. This study shows capsaicin
Area of Science:
- Neuroscience
- Pharmacology
- Pain Research
Background:
- Capsaicin is known for its antinociceptive properties.
- Its effects on spinal nociceptive responses require further elucidation.
Purpose of the Study:
- To investigate the impact of capsaicin on nociceptive responses in the spinal cord.
- To examine capsaicin's effects on both in vivo and in vitro spinal cord preparations.
Main Methods:
- Recording neuronal activity in the dorsal horn of anesthetized rats.
- Administering capsaicin systemically, intradermally, and intrathecally.
- Utilizing a neonatal rat spinal cord-tail preparation in vitro.
- Measuring tissue capsaicin concentrations using HPLC.
Main Results:
- Systemic capsaicin reduced C-fibre evoked input in rats.
- Local capsaicin injections caused transient excitation followed by insensitivity.
- Spinal capsaicin rapidly attenuated evoked C-fibre input.
- In vitro, capsaicin reduced responses to noxious heat and substance P.
Conclusions:
- Capsaicin effectively modulates spinal nociceptive processing.
- It exhibits both local and systemic antinociceptive effects.
- These findings support capsaicin's role in pain management strategies.