期刊
NEUROPHARMACOLOGY
卷 52, 期 2, 页码 655-661出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropharm.2006.09.008
关键词
central sensitization; pain; hyperalgesia; spinal cord; neuropathic pain; pain memory
资金
- Austrian Science Fund FWF [P 18129] Funding Source: Medline
We recently reported perceptual correlates of long-term potentiation (LTP) of synaptic strength within the nociceptive system demonstrating the functional relevance of UP for human pain sensation. UP is generally classified as NMDA-receptor dependent or independent. Here we show that low doses of the NMDA-receptor antagonist ketamine (0.25 mg/kg) prevented the long-term increase in perceived pain to electrical test stimuli, which was induced by high-frequency electrical stimulation (HFS) of nociceptive afferents. Whereas in a control experiment HFS led to a stable increase in perceived pain by 51% for the entire observation period of I It HFS given 4 min after i.v. ketamine was ineffective. In contrast, HFS induced a two-fold increase of pinprick-evoked pain surrounding the HFS site (secondary neurogenic hyperalgesia) in both experiments. Pain evoked by light tactile stimuli (allodynia) was also unaffected by ketamine. These data support the concept that homotopic hyperalgesia to electrical stimulation of the conditioned pathway is a perceptual correlate of NMDA-receptor sensitive homosynaptic LTP in the nociceptive system, e.g. in the spinal cord. Although secondary neurogenic hyperalgesia and allodynia are induced by the same HFS protocol, they involve additional NMDA-receptor insensitive mechanisms of heterosynaptic facilitation. (c) 2006 Elsevier Ltd. All rights reserved.
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