title: MicroRNA expression profiles differentiate chronic pain condition subtypes.
abstract: Chronic pain is a significant health care problem, ineffectively treated because of its unclear etiology and heterogeneous clinical presentation. Emerging evidence demonstrates that microRNAs (miRNAs) regulate the expression of pain-relevant genes, yet little is known about their role in chronic pain. Here, we evaluate the relationship among pain, psychological characteristics, plasma cytokines, and whole blood miRNAs in 22 healthy controls (HCs); 33 subjects with chronic pelvic pain (vestibulodynia, VBD); and 23 subjects with VBD and irritable bowel syndrome (VBD + IBS). VBD subjects were similar to HCs in self-reported pain, psychological profiles, and remote bodily pain. VBD + IBS subjects reported decreased health and function; and an increase in headaches, somatization, and remote bodily pain. Furthermore, VBD subjects exhibited a balance in proinflammatory and anti-inflammatory cytokines, whereas VBD + IBS subjects failed to exhibit a compensatory increase in anti-inflammatory cytokines. VBD subjects differed from controls in expression of 10 miRNAs of predicted importance for pain and estrogen signaling. VBD + IBS subjects differed from controls in expression of 11 miRNAs of predicted importance for pain, cell physiology, and insulin signaling. miRNA expression was correlated with pain-relevant phenotypes and cytokine levels. These results suggest that miRNAs represent a valuable tool for differentiating VBD subtypes (localized pain with apparent peripheral neurosensory disruption vs widespread pain with a central sensory contribution) that may require different treatment approaches.
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC.
authors.forename: Brittney P
authors.initials: BP
authors.lastname: Ciszek
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC.
authors.forename: Asma A
authors.initials: AA
authors.lastname: Khan
authors.affiliation: Cystic Fibrosis Center, University of North Carolina, Chapel Hill, NC.
authors.forename: Hong
authors.initials: H
authors.lastname: Dang
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC.
authors.forename: Gary D
authors.initials: GD
authors.lastname: Slade
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC.
authors.forename: Shad
authors.initials: S
authors.lastname: Smith
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC.
authors.forename: Eric
authors.initials: E
authors.lastname: Bair
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC.
authors.forename: William
authors.initials: W
authors.lastname: Maixner
authors.affiliation: Pelvic Pain Center, University of North Carolina, Chapel Hill, NC.
authors.forename: Denniz
authors.initials: D
authors.lastname: Zolnoun
authors.affiliation: Center for Pain Research and Innovation, University of North Carolina, Chapel Hill, NC. Electronic address: andrea_neely@unc.edu.
authors.forename: Andrea G
authors.initials: AG
authors.lastname: Nackley
mesh_terms: D000328:Adult; D059350:Chronic Pain / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D008297:Male; D035683:MicroRNAs / Q000235:genetics*
chemical_list: D035683:MicroRNAs