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Interleukin (IL) 8 was measured in CSF of 14 patients with severe traumatic brain injury. IL-8 levels were significantly higher in CSF (up to 8,000 pg/ml) than serum (up to 2,400 pg/ml) (p &lt; 0.05), suggesting intrathecal production. Maximal IL-8 values in CSF correlated with a severe dysfunction of the blood–brain barrier. Nerve growth factor (NGF) was detected in CSF of 7 of 14 patients (range of maximal NGF: 62–12,130 pg/ml). IL-8 concentrations were significantly higher in these patients than in those without NGF (p &lt; 0.01). CSF containing high IL-8 (3,800–7,900 pg/ml) induced greater NGF production in cultured astrocytes (202–434 pg/ml) than samples with low IL-8 (600–1,000 pg/ml), which showed a smaller NGF increase (0–165 pg/ml). Anti-IL-8 antibodies strongly reduced (52–100%) the release of NGF in the group of high IL-8, whereas in the group with low IL-8, this effect was lower (0–52%). The inability of anti-IL-8 antibodies to inhibit the synthesis of NGF completely may depend on cytokines like tumor necrosis factor α and IL-6 found in these CSF samples, which may act in association with IL-8. Thus, IL-8 may represent a pivotal cytokine in the pathology of brain injury.

journal of cerebral blood flow and metabolism

Interleukin-8 Released into the Cerebrospinal Fluid after Brain Injury is Associated with Blood–Brain Barrier Dysfunction and Nerve Growth Factor Production