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The insular cortex (IC) plays a principal role in the regulation of pain processing. Although opioidergic agonists depress cortical excitatory synaptic transmission, little is known about opioidergic roles in inhibitory synaptic transmission. In the IC, the opioid receptors differentially regulate the excitatory propagation: agonists of the mu (MOR), delta (DOR), and kappa (KOR) exhibit suppressive,...
The insular cortex (IC) contributes to nociceptive information processing. IC neurons express opioid receptors, including the mu (MOR), kappa (KOR), and delta (DOR) subtypes. Opioidergic agonists suppress excitatory synaptic transmission in the cerebral cortex. In addition, morphine injection into the IC reduces responses to noxious thermal stimuli. However, the mechanisms of the opioid-dependent...
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