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Neurology. 2007 Jul 3;69(1):42-9.

Differential expression of cytokines in painful and painless neuropathies.

Author information

  • 1Department of Neurology, University of Würzburg, Würzburg, Germany. ueceyler_n@klinik.uni-wuerzburg.de

Abstract

BACKGROUND:

Pain is a common symptom in peripheral neuropathies. The factors determining why some peripheral neuropathies are painful and others are not are incompletely understood. Pro-inflammatory cytokines have been implicated to play a crucial role in the generation of pain.

OBJECTIVE:

To investigate whether cytokine profiles differ between patients with painful or painless neuropathy.

METHODS:

In this prospective study, we analyzed blood mRNA and protein levels of the pro-inflammatory cytokines interleukin-2 (IL-2) and tumor necrosis factor-alpha (TNF) and the anti-inflammatory cytokines IL-4 and IL-10 in 32 patients with painful neuropathy, 20 patients with painless neuropathy, and 38 healthy control subjects, using quantitative real-time PCR and ELISA.

RESULTS:

Patients with a painful neuropathy had about twofold higher IL-2 mRNA (p = 0.001) and TNF mRNA (p < 0.0001) and protein levels (p = 0.009) than healthy control subjects and about twofold higher IL-2 and TNF mRNA (p = 0.03; p = 0.001) and protein levels (p = 0.04; p = 0.04) than patients with painless neuropathy. In contrast, mRNA levels of the anti-inflammatory cytokine IL-10 were about twofold higher in patients with painless neuropathy than in patients with painful neuropathy (p = 0.001) and controls (p = 0.004). IL-4 protein levels were 20-fold higher in patients with painless neuropathy (p < 0.0001) and 17-fold higher in patients with painful neuropathy (p < 0.0001) than in healthy control subjects.

CONCLUSIONS:

A pro-inflammatory cytokine profile seems to be associated with pain in the setting of a peripheral neuropathy, corroborating findings in animal models with experimental painful neuropathies. This may have implications for future treatment strategies.

PMID:
17606879
[PubMed - indexed for MEDLINE]
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