Expression levels of IL‑17 and TNF‑α in degenerated lumbar intervertebral discs and their correlation

Liu,Xiao‑Gang; Hou,Hong‑Wei; Liu,Yi‑Lin

doi:10.3892/etm.2016.3250

Expression levels of IL‑17 and TNF‑α in degenerated lumbar intervertebral discs and their correlation

Authors:
- Xiao‑Gang Liu
- Hong‑Wei Hou
- Yi‑Lin Liu
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Affiliations: Department of Orthopedics, Weihai Hospital of Qingdao University, Weihai, Shandong 264200, P.R. China, Department of Information, Weihai Hospital of Qingdao University, Weihai, Shandong 264200, P.R. China, Department of Internal Medicine, Worker's Hospital of Xinjiang Dushanzi Mining Area Services Division, Karamay, Xinjiang 833699, P.R. China
Published online on: April 11, 2016 https://doi.org/10.3892/etm.2016.3250
Pages: 2333-2340

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Abstract

The present study aimed to investigate the expression and roles of interleukin (IL)‑17 and tumor necrosis factor (TNF)‑α in intervertebral disc degeneration (IDD) and to identify the association between the effects of IL‑17 and TNF‑α in IDD. This may increase understanding of the pathogenic mechanism underlying IDD, and aid the development of alternative therapies. The experimental group consisted of 40 samples of nucleus pulposus tissue obtained from the intervertebral discs (IVDs) of patients with IDD by surgical intervention, and was further divided into an annulus fibrosus disrupted group, comprising 18 patients in which the external annulus was ruptured, and an annulus fibrosus intact group comprising 22 patients. The control group consisted of 20 samples of nucleus pulposus tissue from the IVDs of patients with traumatic lumbar disc fractures. The mRNA and protein expression levels of IL‑17 and TNF‑α in the 50 tissue samples were detected by semi‑quantitative reverse transcription polymerase chain reaction and immunohistochemical staining, respectively, and the results were statistically analyzed. The IL‑17 and TNF‑α protein and mRNA expression levels in the annulus fibrosus disrupted and annulus fibrosus intact groups were both higher compared with those in the control group. In addition, the expression levels of IL‑17 and TNF‑α in the annulus fibrosus disrupted group were significantly higher compared with those in the annulus fibrosus intact group (P<0.01). A positive correlation was identified between the mRNA and protein expression levels of IL‑17 and TNF‑α in the experimental group (r=0.957, P<0.01). IL‑17 and TNF‑α may therefore be involved in the progression of human IDD, and may have synergistic effects in the development of IDD.

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