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Dynamic Quantitative Sensory Testing to Characterize Central Pain Processing
Published on: February 16, 2017
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The Contribution of Baseline Circulating Endocannabinoids to Individual Differences in Human Pain Sensitivity: A
S A Fatemi1, S S Abssy1, S L Bourke1,2
1Centre for Multimodal Sensorimotor and Pain Research, Faculty of Dentistry, University of Toronto, Toronto, Canada.
Biorxiv : the Preprint Server for Biology
|September 5, 2025
Summary
The endocannabinoid system, including anandamide and 2-arachidonoylglycerol, influences pain perception. While not globally predictive, FAAH substrates like anandamide and oleoylethanolamide correlate with pressure pain thresholds in healthy adults.
Area of Science:
- Neuroscience
- Pharmacology
- Human Physiology
Background:
- The endocannabinoid (eCB) system modulates nociception, with evidence suggesting its role in individual pain differences.
- The FAAH C385A polymorphism is linked to reduced pain sensitivity in humans, implying eCB tone influences pain perception.
Purpose of the Study:
- To investigate the association between the eCB system and somatosensory/pain sensitivity using quantitative sensory testing (QST).
- To test if FAAH genotype, cannabis use, or sex influence serum eCB/NAE concentrations.
- To determine if FAAH genotype or baseline eCB/NAE levels correlate with QST measures.
Main Methods:
- Quantitative sensory testing (QST) was performed on 91 healthy participants.
- Serum concentrations of eCBs (anandamide, 2-AG) and NAEs (PEA, OEA) were measured.
- Factor analysis and linear regressions were used to analyze relationships between genotype, serum levels, and QST outcomes.
Main Results:
- Serum eCB/NAE concentrations did not differ significantly based on sex, FAAH genotype, or cannabis use.
- FAAH genotype did not impact QST measures.
- Baseline 2-AG and general FAAH substrate levels were not associated with QST, except for pressure pain thresholds (PPT).
- Circulating anandamide (AEA) and oleoylethanolamide (OEA) levels were associated with PPT.
Conclusions:
- Baseline eCB/NAE levels may not be a universal predictor of somatosensory and pain sensitivity in healthy adults.
- Circulating levels of FAAH substrates, specifically AEA and OEA, show an association with pressure pain thresholds.
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