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- W2060810312 abstract "We examined the effect of the peripheral application of glutamate and capsaicin to the temporomandibular joint (TMJ) in influencing the activation and central sensitization of TMJ-responsive nociceptive neurons in the trigeminal subnucleus caudalis/upper cervical cord (Vc/UCC). The activity of single neurons activated by noxious mechanical stimulation of the TMJ was recorded in the Vc/UCC of 49 halothane-anesthetized male rats. Cutaneous mechanoreceptive field (RF), cutaneous mechanical activation threshold (MAT), and TMJ MAT of each neuron were assessed before and after injection of 0.5 M glutamate (or vehicle) and 1% capsaicin (or vehicle) into the TMJ. A total of 49 nociceptive neurons (37 nociceptive-specific, 12 wide-dynamic-range) that could be activated by blunt noxious mechanical stimulation of the TMJ were studied. When injected alone, glutamate and capsaicin activated and induced central sensitization (reflected in cutaneous RF expansion and cutaneous and/or TMJ MAT reduction) in most Vc/UCC neurons. Following glutamate injection, capsaicin evoked greater activity and less cutaneous/TMJ MAT reduction compared with capsaicin alone, whereas capsaicin abolished all subsequent glutamate-evoked activity and depressed cutaneous RF expansion in most neurons. Glutamate effects on deep afferents and Vc/UCC neurons were analogous since glutamate sensitized afferent and neuronal responses to capsaicin but the desensitizing effects of capsaicin on glutamate-evoked excitability of Vc/UCC neurons contrast with the lack of capsaicin-induced modulation of glutamate-evoked afferent excitability [Lam, D.K., Sessle, B.J., Hu, J.W., 2008a. Glutamate and capsaicin effects on trigeminal nociception I: activation and peripheral sensitization of deep craniofacial nociceptive afferents. Brain Res. doi:10.1016/j.brainres.2008.11.029], suggesting that peripheral and central sensitization may be differentially involved in the nociceptive effects of glutamate and capsaicin applied to deep craniofacial tissues." @default.
- W2060810312 created "2016-06-24" @default.
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- W2060810312 date "2009-02-01" @default.
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- W2060810312 title "Glutamate and capsaicin effects on trigeminal nociception II: Activation and central sensitization in brainstem neurons with deep craniofacial afferent input" @default.
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- W2060810312 doi "https://doi.org/10.1016/j.brainres.2008.11.056" @default.
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