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Reverse-engineering placebo analgesia.

Bin Chen¹, Nitsan Goldstein¹, Julia Dziubek¹

¹McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 43 Vassar Street, Cambridge, MA 02139, USA.

Current Biology : CB

|September 6, 2024

Summary

This summary is machine-generated.

Researchers engineered placebo analgesia in mice by pairing a context with pain relief from central amygdala neurons. This context-dependent pain relief exceeded morphine effects, revealing new therapeutic potential.

Keywords:

acute pain anesthesia associative learning central amygdala chronic pain placebo analgesia

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Determining Pain Detection and Tolerance Thresholds Using an Integrated, Multi-Modal Pain Task Battery

Determining Pain Detection and Tolerance Thresholds Using an Integrated, Multi-Modal Pain Task Battery

Published on: April 14, 2016

Area of Science:

Neuroscience
Pain Research
Behavioral Pharmacology

Background:

Placebo analgesia is a known phenomenon, but robust rodent models are lacking for mechanistic studies.
Previous attempts to model placebo analgesia in rodents with chronic pain have yielded inconsistent results.

Purpose of the Study:

To establish a reliable mouse model of placebo analgesia.
To investigate the neural circuits underlying placebo analgesia.
To explore methods for engineering placebo effects for pain management.

Main Methods:

Utilized general-anesthesia-activated neurons in the central amygdala (CeA_GA) to induce potent pain relief.
Paired a specific context with CeA_GA-mediated analgesia in acute and chronic pain models.
Performed in vivo imaging to observe CeA_GA neuron activity in the conditioned context.

Main Results:

Conditioning with CeA_GA activation produced robust, context-dependent analgesia, surpassing morphine's effects.
CeA_GA neurons were not reactivated in the conditioned context, despite the analgesic phenotype.
Placebo-induced analgesia appears to engage circuits beyond CeA_GA, involving other analgesic/nociceptive pathways.

Conclusions:

Activation of a central pain-suppressing circuit can engineer placebo analgesia.
Contextual conditioning with active treatment can harness placebo effects for pain relief.
The findings suggest plasticity in broader neural circuits mediates engineered placebo analgesia.