scholarly journals Involvement of Spinal Substance P and Excitatory Amino Acids in Inflammatory Hyperalgesia in Rats.

1998 ◽  
Vol 76 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Kazuhiko Okano ◽  
Yasushi Kuraishi ◽  
Masamichi Satoh
Keyword(s):  
Amino Acids ◽  
Substance P ◽  
Excitatory Amino Acids ◽  
Inflammatory Hyperalgesia

Central sensitization following intradermal injection of capsaicin

1997 ◽  
Vol 20 (3) ◽  
pp. 471-471 ◽  
Author(s):  
William D. Willis
Keyword(s):  
Amino Acids ◽  
Substance P ◽  
Central Sensitization ◽  
Mechanical Allodynia ◽  
Excitatory Amino Acids ◽  
Intradermal Injection ◽  
Mechanical Hyperalgesia ◽  
Spinothalamic Tract ◽  
Nociceptive Neurons ◽  
Primary Hyperalgesia

Intradermal capsaicin in humans causes pain, primary hyperalgesia, and secondary mechanical hyperalgesia and allodynia. Parallel changes occur in the responses of primate spinothalamic tract cells and in rat behavior. Neurotransmitters that trigger secondary mechanical hyperalgesia and allodynia include excitatory amino acids and substance P. Secondary mechanical allodynia is actively maintained by central mechanisms. Our group has investigated mechanisms of central sensitization of nociceptive neurons by examining the responses to intradermal injection of capsaicin. These experiments are pertinent to issues raised by coderre & katz (sect. 2).

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