Perceptual correlates of nociceptive long-term potentiation and long-term depression in humans.

Content Provider	Semantic Scholar
Author	Klein, Thomas Magerl, Walter Hopf, Hanns-Christian Sandkühler, Jürgen Treede, Rolf-Detlef
Copyright Year	2004
Abstract	Long-term potentiation (LTP) and long-term depression (LTD) of synaptic strength are ubiquitous mechanisms of synaptic plasticity, but their functional relevance in humans remains obscure. Here we report that a long-term increase in perceived pain to electrical test stimuli was induced by high-frequency electrical stimulation (HFS) (5 x 1 sec at 100 Hz) of peptidergic cutaneous afferents (27% above baseline, undiminished for >3 hr). In contrast, a long-term decrease in perceived pain (27% below baseline, undiminished for 1 hr) was induced by low-frequency stimulation (LFS) (17 min at 1 Hz). Pain testing with punctate mechanical probes (200 microm diameter) in skin adjacent to the HFS-LFS conditioning skin site revealed a marked twofold to threefold increase in pain sensitivity (secondary hyperalgesia, undiminished for >3 hr) after HFS but also a moderate secondary hyperalgesia (30% above baseline) after strong LFS. Additionally, HFS but not LFS caused pain to light tactile stimuli in adjacent skin (allodynia). In summary, HFS and LFS stimulus protocols that induce LTP or LTD in spinal nociceptive pathways in animal experiments led to similar LTP- and LTD-like changes in human pain perception (long-term hyperalgesia or hypoalgesia) mediated by the conditioned pathway. Additionally, secondary hyperalgesia and allodynia in adjacent skin induced by the HFS protocol and, to a minor extent, also by the LFS protocol, suggested that these perceptual changes encompassed an LTP-like heterosynaptic facilitation of adjacent nociceptive pathways by a hitherto unknown mechanism.
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Alternate Webpage(s)	http://www.jneurosci.org/content/jneuro/24/4/964.full.pdf
Alternate Webpage(s)	http://www.jneurosci.org/content/24/4/964.full.pdf
PubMed reference number	14749441v1
Volume Number	24
Issue Number	4
Journal	The Journal of neuroscience : the official journal of the Society for Neuroscience
Language	English
Access Restriction	Open
Subject Keyword	Acute onset pain Aplysia BaseLine dental cement CNS disorder Chronic pain Conditioning (Psychology) Depressive disorder Diameter (qualifier value) Electric stimulation technique Hearing Loss, High-Frequency Hertz (Hz) Hyalinosis, Systemic Hyperalgesia Li-Fraumeni Syndrome Long-Term Potentiation Memory Disorders Nervous system structure Neuronal Plasticity Neuroscience discipline Pain Perception Protocols documentation Reflex action Soft Tissue Injuries Substance Withdrawal Syndrome chemosensitization/potentiation facilitation hypalgesia
Content Type	Text
Resource Type	Article