title: Circulating tumor necrosis factor-alpha correlates with electrodiagnostic abnormalities in Guillain-Barré syndrome.
abstract: Autoimmune damage to peripheral nerves, mediated by activated T lymphocytes and macrophages, underlies the pathogenesis of inflammatory demyelination in Guillain-Barré syndrome. Both T lymphocytes and macrophages secrete tumor necrosis factor-alpha, a cytokine that exerts toxic effects on myelin, Schwann cells, and endothelial cells. The reportedly high serum levels of this cytokine in patients with Guillain-Barré syndrome may reflect the degree of immune activation rather than a direct pathogenic effect. We compared serum levels of tumor necrosis factor-alpha, interleukin-1 beta, and soluble interleukin-2 receptor with well-established electrodiagnostic criteria for primary demyelination in 23 patients with Guillain-Barré syndrome, to assess the relationship between these cytokines and peripheral myelin damage. High serum levels of tumor necrosis factor-alpha were associated with prolonged distal motor latencies and slowed motor conduction velocities, prolonged or absent F-wave responses, and reduced amplitude of distal compound muscle action potentials. No significant correlation was observed between electrodiagnostic criteria for primary demyelination and serum levels of interleukin-1 beta or soluble interleukin-2 receptor. These findings suggest a putative role of tumor necrosis factor-alpha in the pathogenesis of peripheral nerve demyelination in Guillain-Barré syndrome.
authors.affiliation: Department of Neurology, Royal London Hospital, England.
authors.forename: M K
authors.initials: MK
authors.lastname: Sharief
authors.forename: D A
authors.initials: DA
authors.lastname: Ingram
authors.forename: M
authors.initials: M
authors.lastname: Swash
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004568:Electrodiagnosis; D005260:Female; D006801:Humans; D007375:Interleukin-1 / Q000097:blood; D008875:Middle Aged; D009994:Osmolar Concentration; D011129:Polyradiculoneuropathy / Q000097:blood* / Q000175:diagnosis*; D015375:Receptors, Interleukin-2 / Q000097:blood; D012995:Solubility; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis*
chemical_list: D007375:Interleukin-1; D015375:Receptors, Interleukin-2; D014409:Tumor Necrosis Factor-alpha