European Spine Journal

, Volume 11, Issue 5, pp 467–475

Dorsal root sensitivity to interleukin-1 beta, interleukin-6 and tumor necrosis factor in rats

  • Cüneyt A. Özaktay
  • John M. Cavanaugh
  • Ibrahim Asik
  • Joyce A. DeLeo
  • James N. Weinstein
Original Article

DOI: 10.1007/s00586-002-0430-x

Cite this article as:
Özaktay, C.A., Cavanaugh, J.M., Asik, I. et al. Eur Spine J (2002) 11: 467. doi:10.1007/s00586-002-0430-x

Abstract.

The release of inflammatory cytokines caused by a disrupted disc may play a critical role in pain production at nerve endings, axons, and nerve cell bodies. Herniated disc tissue has been shown to release inflammatory cytokines such as interleukin-1 beta (IL-1β), interleukin-6 (IL-6), tumor necrosis factor (TNF), and other algesic chemicals. This study was designed to characterize the effects of these proinflammatory cytokines on the somatosensory neural response at the dorsal root level in rats. It is hypothesized that their effects on nerve endings in disc and adjacent tissue contribute to low-back pain, and the effects on dorsal root axons and ganglia contribute to radiculopathy and sciatica. Surgically isolated sacral dorsal roots were investigated by electrophysiologic techniques. IL-1β, IL-6, or TNF (100 ng, each) were applied onto the dorsal roots. Neural responses and mechanosensitivity of the receptive fields were evaluated over time. The results showed that 3 h after each cytokine application, the neural activity was statistically decreased. The mechanical sensitivity of the receptive fields increased at 90 min following IL-1β or TNF application, and returned to normal more than 3 h after IL-1β application. IL-1β, IL-6, and TNF may be neurotoxic to dorsal root axons. Furthermore IL-1β and TNF may sensitize the peripheral receptive fields. This study suggests that dorsal roots may be impaired by these proinflammatory cytokines.

Interleukin-1 beta Interleukin-6 Tumor necrosis factor Radiculopathy Low-back pain 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Cüneyt A. Özaktay
    • 1
  • John M. Cavanaugh
    • 1
  • Ibrahim Asik
    • 2
  • Joyce A. DeLeo
    • 3
  • James N. Weinstein
    • 3
  1. 1.Wayne State University, Bioengineering Center, 818W Hancock, Detroit, MI 48201, USA
  2. 2.University of Ankara, School of Medicine, Ibn-I Sina Hospital, Department of Anesthesiology and Intensive Care, Sihhiye, Ankara, Turkey
  3. 3.Dartmouth-Hitchcock Medical Center, Department of Anesthesiology, Lebanon, New Hampshire, USA

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