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Pathophysiology of disk-related sciatica. I.--Evidence supporting a chemical component
Denis Mulleman1, Saloua Mammou, Isabelle Griffoul
1François Rabelais de Tours University, EA 3853 Immuno-Pharmaco-Génétique des Anticorps thérapeutiques, 37044 Tours, France.
Joint Bone Spine
|July 28, 2005
Summary
Chemical factors from herniated discs, not just pressure, cause sciatica pain. Tumor necrosis factor-alpha (TNF-alpha) is a key inflammatory substance, suggesting TNF-alpha antagonists may treat sciatica.
Area of Science:
- Biomedical Science
- Neuroscience
- Orthopedics
Background:
- Sciatica pain from herniated discs was traditionally attributed solely to mechanical nerve root compression.
- Clinical observations suggest a chemical component contributes to sciatica, as surgery outcomes vary and symptom severity doesn't always correlate with herniation size.
Purpose of the Study:
- To investigate the role of chemical factors, beyond mechanical compression, in causing sciatica related to intervertebral disc disease.
- To identify specific inflammatory substances involved in disc-induced nerve root pain.
Main Methods:
- Review of clinical observations and experimental studies on sciatica pathophysiology.
- Analysis of animal models demonstrating nucleus pulposus (NP) induced nerve root abnormalities.
- Evaluation of the inhibitory effects of various drugs on NP-induced nerve root damage.
Main Results:
- Experimental evidence shows nucleus pulposus (NP) can cause nerve root dysfunction without mechanical compression.
- Inflammatory mediators secreted by NP cells are implicated in nerve root pain.
- Tumor necrosis factor-alpha (TNF-alpha) is identified as a primary candidate substance responsible for nerve root pain.
Conclusions:
- Sciatica involves both mechanical and chemical factors, with inflammatory substances from the NP playing a significant role.
- Targeting TNF-alpha with antagonists presents a promising therapeutic strategy for managing disk-related sciatica.