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ACC Plasticity Maintains Masseter Hyperalgesia Caused by Occlusal Interference.

X X Xu1, Y Cao1, S Y Mo1

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Improper dental work can cause chronic jaw pain by altering brain pathways. This study shows that blocking specific glutamate receptors in the anterior cingulate cortex (ACC) can relieve this pain in rats.

Keywords:
anterior cingulate cortexchronic masticatory muscle painglutamate receptorlong term potentiationocclusal interferencesynaptic transmission

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Area of Science:

  • Neuroscience
  • Pain Research
  • Dental Science

Background:

  • Acute occlusal interference, often from dental alterations, can lead to chronic masticatory muscle pain.
  • The precise mechanisms driving this pain, particularly the role of synaptic plasticity in the anterior cingulate cortex (ACC), remain unclear.

Purpose of the Study:

  • To investigate the role of synaptic plasticity in the ACC in the development of chronic masticatory muscle pain induced by acute occlusal interference.
  • To explore the involvement of glutamate receptors in the ACC in mediating this pain.

Main Methods:

  • Established a rat model of experimental occlusal interference (EOI).
  • Utilized in vivo local field potential (LFP) recordings to assess synaptic strength and plasticity from the medial thalamus (MT) to the ACC.
  • Administered glutamate receptor antagonists (CNQX and Ro 25-6981) into the ACC via microdialysis to examine their effects on synaptic transmission and pain.

Main Results:

  • EOI application led to significant potentiation of LFP amplitude in the ACC.
  • Long-term potentiation (LTP) in the ACC was occluded in EOI rats, indicating altered synaptic plasticity.
  • Blocking NMDA receptors (NR2B subunit) in the ACC with Ro 25-6981 alleviated EOI-induced potentiation of LFP and relieved mechanical hyperalgesia in masseter muscles.

Conclusions:

  • Prolonged acute occlusal interference potentiates synaptic transmission in the ACC.
  • This potentiation, mediated by glutamate receptors (specifically NMDA receptors), plays a crucial role in the development of chronic masticatory muscle pain.
  • Targeting synaptic plasticity in the ACC may offer a therapeutic strategy for managing dental occlusion-induced pain.