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Spinal NMDA-recepto...
Spinal NMDA-receptor dependent amplification of nociceptive transmission to rat primary somatosensory cortex (SI).
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Kalliomäki, Jarkko (författare)
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- Granmo, Marcus (författare)
- Lund University,Lunds universitet,Neurofysiologi,Forskargrupper vid Lunds universitet,Neurophysiology,Lund University Research Groups
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- Schouenborg, Jens (författare)
- Lund University,Lunds universitet,Neurofysiologi,Forskargrupper vid Lunds universitet,Neurophysiology,Lund University Research Groups
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Pain. - 1872-6623. ; 104:1-2, s. 195-200
- Relaterad länk:
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http://www.ncbi.nlm....
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visa fler...
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The role of NMDA mechanisms in spinal pathways mediating acute nociceptive input to the somatosensory cortex is not clear. In this study, the effect of NMDA-antagonists on nociceptive C fibre transmission to the primary somatosensory cortex (SI) was investigated. Cortical field potentials evoked by CO2-laser stimulation of the skin were recorded in the halothane/nitrous oxide anaesthetized rat. The SI nociceptive evoked potential (EP) amplitudes were dependent on the frequency of noxious heat stimulation. The amplitudes of SI potentials evoked by CO2-laser pulses (duration 15–20 ms, stimulation energy 21–28 mJ/mm2) delivered at a frequency of 0.1 Hz were approximately 40% of the amplitudes of potentials evoked by 1.0 Hz stimulation. After intrathecal lumbar application of either of the NMDA-antagonists CPP or MK-801, the amplitudes of nociceptive SI potentials, evoked by 1.0 Hz stimulation of the contralateral hindpaw, were reduced to approximately 40% of controls. By contrast, field potentials evoked by 0.1 Hz stimulation of the hindpaw were unaffected by MK-801. SI potentials evoked by 1.0 Hz stimulation of the contralateral forepaw did not change after lumbar application of CPP or MK-801, indicating that the depression of hindpaw EPs was due to a segmental effect in the spinal cord. It is concluded that spinal NMDA-receptor mechanisms amplify the acute transmission of nociceptive C fiber input to SI in a frequency-dependent way.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Neurovetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Neurosciences (hsv//eng)
Nyckelord
- C fibre
- Nociception
- Pain
- Somatosensory cortex
- NMDA-receptor
- Wind-up
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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