Evidence and explanation for the involvement of the nucleus accumbens in pain processing.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing preclinical and clinical mechanistic data without systematic methodology.
PubMed 31638081 · doi:10.4103/1673-5374.266909
What was done
The authors summarized anatomical, pharmacological, and therapeutic evidence regarding the involvement of the nucleus accumbens in pain processing, pain modulation, and analgesia across preclinical and clinical literature.
What was found
The abstract reports no numerical data or effect sizes. It details that the nucleus accumbens receives input from and projects to key pain-processing structures (prefrontal cortex, anterior cingulate cortex, periaqueductal gray, habenula, thalamus), expresses high densities of μ-opioid receptors, responds via multiple neurotransmitter systems (opioids, dopamine, CGRP, GABA, glutamate, substance P) associated with analgesia, and produces pain relief upon deep brain stimulation.
Why it matters
It highlights that the nucleus accumbens functions beyond reward and addiction, acting as a critical integration hub for motivational salience in pain avoidance and analgesia.
Limits
As a narrative review, it lacks a systematic search protocol, explicit inclusion criteria, and quality assessment. The abstract reports no quantitative results, sample sizes, or clinical safety profiles for interventions such as deep brain stimulation.
Cited by
- supports The brain processes pleasure and pain within the same anatomical neural regions.