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Presynaptic cGMP-dependent protein kinase-I mediates synaptic potentiation in spinal amplification of pain
BMC Pharmacology volume 9, Article number: S25 (2009)
Activity-dependent facilitation of pain is functionally linked to plasticity at synapses between peripheral sensory afferents and spinal projection neurons. However, the underlying cellular and molecular mechanisms are not well-understood . We observed that long-term potentiation at these synapses involves a presynaptic mechanism comprising activity-induced decrease in synaptic failures. This process involves activation of the cGMP-dependent protein kinase-I (PKG-I) in presynaptic terminals of nociceptive afferents and potentiation of vesicular transmitter release via modulation of IP3 receptors and myosin light chains. Mice lacking PKG-I specifically in nociceptors did not develop spinal long-term potentiation and showed marked defects in pathological pain in vivo.
Our results reveal a causal link between PKG-I-dependent presynaptic modulation of transmitter release, long-term potentiation at spinal synapses and the induction of pathological pain.
Woolf CJ, Salter MW: Neuronal plasticity: Increasing the gain in pain. Science. 2000, 288: 1765-1768. 10.1126/science.288.5472.1765.
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Luo, C., Kuner, R. Presynaptic cGMP-dependent protein kinase-I mediates synaptic potentiation in spinal amplification of pain. BMC Pharmacol 9, S25 (2009). https://doi.org/10.1186/1471-2210-9-S1-S25
- Myosin Light Chain
- Transmitter Release
- Presynaptic Terminal
- Spinal Projection
- Sensory Afferents