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Patterns of pain: meta-analysis of microarray studies of pain

Michael L LaCroix-Fralish1, Jean-Sebastien Austin, Felix Y Zheng

  • 1Department of Psychology, McGill University, Montreal, QC, Canada H3A 1B1 Department of Anesthesia Research, Faculty of Dentistry, McGill University, Montreal, QC, Canada H3A 1B1 Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada H3A 1B1.

Pain
|May 13, 2011
PubMed

Insights

This meta-analysis identified 79 key genes consistently regulated in chronic pain states across multiple studies. Immune-related genes were prominent, with Reg3b and Ccl2 showing broad upregulation in rat models.

Area of Science:

  • Neuroscience
  • Genetics
  • Immunology

Background:

  • Chronic pain affects millions globally, with complex underlying genetic mechanisms.
  • Previous gene expression studies have yielded numerous candidate genes, but consistency across studies is lacking.

Purpose of the Study:

  • To identify consistently regulated genes across multiple chronic pain microarray studies using meta-analysis.
  • To functionally annotate identified genes and validate key candidates in animal models.

Main Methods:

  • Meta-analysis of 20 published microarray studies (2002-2008) on tonic/chronic pain.
  • Gene ontology-based functional annotation clustering.
  • Quantitative real-time polymerase chain reaction validation in rat and mouse models of nerve injury and inflammation.

Main Results:

  • Identified 2254 statistically significant genes, with 79 genes consistently regulated (P<0.01) in 4+ independent experiments.
  • Functional annotation revealed significant enrichment of immune-related genes.
  • Validated 43 genes in rat sciatic chronic constriction injury (CCI) model; Reg3b and Ccl2 were upregulated across multiple rat pain conditions.

Conclusions:

  • Meta-analysis reveals a core set of genes, particularly immune-related, involved in chronic pain.
  • Gene expression patterns can be specific to pain etiology, location, and species.
  • Reg3b and Ccl2 represent promising conserved targets for chronic pain research.

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