Elina I Schistad1, Line M Jacobsen, Cecilie Røe, Johannes Gjerstad. 1. *Department of Physical Medicine and Rehabilitation, Oslo University Hospital, Ullevaal †Faculty of Medicine §Department of Molecular Biosciences, University of Oslo ‡National Institute of Occupational Health, Oslo, Norway.
Abstract
OBJECTIVES: Previous studies have suggested that many inflammatory cytokines, including interleukin (IL)-1α, may be associated with lumbar radicular pain after disk herniation. In the present study, we examined how variability of the IL-1α gene affects pain intensity and the pressure pain threshold (PPT) in patients with symptomatic disk herniation. MATERIALS AND METHODS: A total of 121 patients with lumbar radicular pain due to disk herniation were recruited from Oslo University Hospital, Norway, and followed up at 6 weeks and 12 months. The primary outcome measures were pain intensity scores for the lower back and legs using a visual analog pain scale (VAS) and PPT for the gluteal muscles. Genotyping was carried out using a predesigned TaqMan assay for IL-1α rs1800587. The effect of the IL-1α genotype on the VAS and PPT was analyzed by repeated measure analyses of variance. RESULTS: The IL-1α gene C>T polymorphism rs1800587 affected VAS and PPT scores in patients with symptomatic disk herniation. Patients with the CT/TT genotype reported a higher VAS leg pain intensity (P=0.002) and also a lower PPT in the gluteal muscles (left P=0.016; right P=0.016) compared with patients with the CC genotype during 1 year of follow-up. DISCUSSION: The present data show that the IL-1α CT/TT genotype rs1800587 may be associated with increased pain intensity and corresponding reduced PPT during the first year after disk herniation.
OBJECTIVES: Previous studies have suggested that many inflammatory cytokines, including interleukin (IL)-1α, may be associated with lumbar radicular pain after disk herniation. In the present study, we examined how variability of the IL-1α gene affects pain intensity and the pressure pain threshold (PPT) in patients with symptomatic disk herniation. MATERIALS AND METHODS: A total of 121 patients with lumbar radicular pain due to disk herniation were recruited from Oslo University Hospital, Norway, and followed up at 6 weeks and 12 months. The primary outcome measures were pain intensity scores for the lower back and legs using a visual analog pain scale (VAS) and PPT for the gluteal muscles. Genotyping was carried out using a predesigned TaqMan assay for IL-1α rs1800587. The effect of the IL-1α genotype on the VAS and PPT was analyzed by repeated measure analyses of variance. RESULTS: The IL-1α gene C>T polymorphism rs1800587 affected VAS and PPT scores in patients with symptomatic disk herniation. Patients with the CT/TT genotype reported a higher VAS leg pain intensity (P=0.002) and also a lower PPT in the gluteal muscles (left P=0.016; right P=0.016) compared with patients with the CC genotype during 1 year of follow-up. DISCUSSION: The present data show that the IL-1α CT/TT genotype rs1800587 may be associated with increased pain intensity and corresponding reduced PPT during the first year after disk herniation.
Authors: Susan G Dorsey; Cynthia L Renn; Mari Griffioen; Cameron B Lassiter; Shijun Zhu; Heather Huot-Creasy; Carrie McCracken; Anup Mahurkar; Amol C Shetty; Colleen K Jackson-Cook; Hyungsuk Kim; Wendy A Henderson; Leorey Saligan; Jessica Gill; Luana Colloca; Debra E Lyon; Angela R Starkweather Journal: PLoS One Date: 2019-05-16 Impact factor: 3.240