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Role of Neurotransmitters in Sensitization of Pain Responses

Role of Neurotransmitters in Sensitization of Pain Responses Abstract: Injection of capsaicin into the skin results in pain, primary heat and mechanical hyperalgesia, and secondary mechanical allodynia and hyperalgesia. Sensory receptors in the area of secondary mechanical allodynia and hyperalgesia are unaffected, and so the sensory changes must be due to central actions of the initial intense nociceptive discharge that follows the capsaicin injection. Central sensitization of the responses of spinothalamic tract neurons lasts several hours, but can be prevented by spinal cord administration of non‐NMDA and NMDA glutamate receptor antagonists or NK1 substance P receptor antagonists. The long‐lasting increase in excitability of spinothalamic tract cells depends on the activation of several second messenger cascades (PKC, PKA, and NO/PKG signal transduction pathways). The excitability change also depends on activation of calcium/calmodulin‐dependent kinase II, which is consistent with the proposal that this central sensitization response is a form of long‐term potentiation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of the New York Academy of Sciences Wiley

Role of Neurotransmitters in Sensitization of Pain Responses

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References (42)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services
ISSN
0077-8923
eISSN
1749-6632
DOI
10.1111/j.1749-6632.2001.tb05821.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: Injection of capsaicin into the skin results in pain, primary heat and mechanical hyperalgesia, and secondary mechanical allodynia and hyperalgesia. Sensory receptors in the area of secondary mechanical allodynia and hyperalgesia are unaffected, and so the sensory changes must be due to central actions of the initial intense nociceptive discharge that follows the capsaicin injection. Central sensitization of the responses of spinothalamic tract neurons lasts several hours, but can be prevented by spinal cord administration of non‐NMDA and NMDA glutamate receptor antagonists or NK1 substance P receptor antagonists. The long‐lasting increase in excitability of spinothalamic tract cells depends on the activation of several second messenger cascades (PKC, PKA, and NO/PKG signal transduction pathways). The excitability change also depends on activation of calcium/calmodulin‐dependent kinase II, which is consistent with the proposal that this central sensitization response is a form of long‐term potentiation.

Journal

Annals of the New York Academy of SciencesWiley

Published: Jan 1, 2001

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