Circulating microRNAs differentiate nociceptive and nociplastic pain: An exploratory study

Area of Science:

• Biochemistry
• Molecular Biology
• Pain Research

Background:

• Nociceptive and nociplastic pain have distinct mechanisms but are difficult to differentiate clinically.
• Circulating microRNAs (miRNAs) are emerging as potential biomarkers for objective, mechanism-based pain classification.

Purpose of the Study:

• To determine if specific circulating miRNAs can differentiate nociceptive pain in hip osteoarthritis (HO) from nociplastic pain in chronic primary pain (CPP).
• To assess the relationship between these miRNAs and clinical/psychological outcomes.

Main Methods:

• Plasma samples from patients with HO (n=13), CPP (n=11), and controls (n=7) were analyzed using microarray screening and real-time PCR.
• Pain intensity, disability, quality of life, and psychological factors were assessed.
• Decision tree modeling and ROC analysis were used for classification accuracy.

Main Results:

• A predictive model using let-7a, miR-26a, and miR-16 demonstrated strong performance (R²=0.677; AUC>0.94).
• Let-7a correlated with structural changes in HO; miR-26a related to pain traits in CPP; miR-16 decreased post-CBT.
• miR-126 and miR-146a were linked to post-surgical pain reduction in HO.

Conclusions:

• Circulating miRNAs may help differentiate nociceptive and nociplastic pain mechanisms.
• These findings support the potential of miRNA-based biomarkers for precision pain diagnostics and personalized management.