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µ-opioid receptor-mediated downregulation of midline thalamic pathways to basal and central amygdala

L Goedecke1, X Bengoetxea2, P Blaesse2

  • 1Institute of Physiology I, Westfaelische Wilhelms-Universitaet Muenster, Muenster, Germany. lena.goedecke@ukmuenster.de.

Scientific Reports
|November 30, 2019
PubMed

Insights

Brain µ-opioid receptors (MORs) in the dorsal midline thalamus dampen excitatory pathways to the amygdala. This finding reveals how MORs may reduce negative emotional states like pain and anxiety.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Behavioral Science

Background:

  • Brain µ-opioid receptors (MORs) are crucial for reward and managing negative emotions like pain, anxiety, and depression.
  • The dorsal midline thalamus (dMT) processes emotional signals and influences defensive behaviors via amygdala projections.
  • The precise role of MORs in modulating dMT-amygdala circuits is not fully understood.

Purpose of the Study:

  • To investigate the cellular and synaptic mechanisms of µ-opioid modulation within the dMT-amygdala circuitry.
  • To test the hypothesis that MORs negatively modulate excitatory networks in the dMT-amygdala pathway.

Main Methods:

  • Utilized retrograde tracers and channelrhodopsin-assisted circuit mapping.
  • Employed patch-clamp electrophysiology to record neuronal activity.
  • Examined MOR modulation of dMT projections to basal amygdala principal neurons (BA PN) and central amygdala (CeL) neurons.

Main Results:

  • Stimulation of MORs (somatic or synaptic) attenuated dMT neuron projections to both BA PN and CeL neurons.
  • MOR activation dampened the feedforward excitation of centromedial amygdala (CeM) neurons driven by dMT efferents.
  • Demonstrated that MORs act as negative modulators of excitatory activity in the dMT-amygdala pathway.

Conclusions:

  • µ-opioid receptor activation downregulates excitatory activity in dMT-amygdala networks.
  • This downregulation suggests a mechanism by which the µ-opioid system alleviates aversive states linked to stress, pain, and social rejection.

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