Tumor necrosis factor-alpha, interleukin-1beta and interleukin-6 in the cerebrospinal fluid of newborn with meningitis

OBJETIVO: Analisar a utilidade da dosagem dos níveis de fator de necrose tumoral-a(TNF-a), interleucin-1b(IL-1b) e interleucina-6(IL-6) no líquido cefalorraqueano (LCR) para o diagnóstico precoce e avaliação do prognóstico da meningite neonatal. MÉTODO: Foram estudados 54 recém-nascidos submetidos à punção lombar.Trinta pacientes apresentavam meningite e 24 constituíram o grupo controle. As amostras de LCR e sangue foram obtidas no momento da suspeita clínica de meningite e estocadas a - 700C.A dosagem de citocinas foi feita pelo método ELISA (enzyme-linked immunosorbent assay). RESULTADOS: Foram detectadas citocinas no LCR em todos os neonatos com meningite. O TNF-a foi detectado em 63,3% dos casos, a IL-1b em 73,3% e a IL-6 em 96,6%. Os níveis liquóricos foram significativamente mais elevados do que os séricos nos neonatos com meningite. Não houve correlação entre os níveis de citocinas no LCR e complicações neurológicas. CONCLUSÃO: A detecção de TNF-a, IL-1b e IL-6 no LCR é de grande valor para o diagnóstico precoce de meningite neonatal. Entre as três citocinas analisadas, a IL-6 foi o melhor indicador de inflamação meníngea.

Cytokine Levels in Cerebrospinal Fluid and Delayed Ischemic Deficits in Patients with Aneurysmal Subarachnoid Hemorrhage

Subarachnoid hemorrhage (SAH) induces an inflammatory reaction and may lead to ischemic brain damage. The pathogenesis of brain dysfunction and delayed ischemic symptoms remain difficult to understand despite extensive surveys of such reactions. Cytokine production in the central nervous system following SAH and its relation with clinical outcome have hardly been studied. This study was aimed to determine whether the levels of IL-1 beta, IL-6 and TNF-alpha in the initial cerebrospinal fluid would increase following aneurysmal SAH, and be related with development of delayed ischemic deficit and clinical outcome. Nineteen patients suffering from aneurysmal SAH and 12 control volunteers were the subjects in this study. Cerebrospinal fluid samples were obtained on admission and the levels of each cytokine were determined with enzyme-linked immunosorbent assay. Patients with aneurysmal subarachnoid hemorrhage showed elevated levels of IL-1 beta, and TNF-alpha on admission. The patients with poor neurological status showed high levels of IL-1 beta, and IL-6. The patients who developed delayed ischemic deficit had high level of IL-6. We suggest that elevated level of IL-6 in cerebrospinal fluid of patients with aneurysmal SAH on admission can predict the high risk of delayed ischemic deficit.

Interleukin-5 and interleukin-10 are major cytokines in cerebrospinal fluid from patients with active neurocysticercosis

Neurocysticercosis (NCC) is a common neurological disorder especially in developing countries, caused by infection of the brain with encysted larvae of the tapeworm Taenia solium. Seizures are a common finding associated with this disease. The objective of the present study was to evaluate the correlation between the levels of various cytokines present in the cerebrospinal fluid (CSF) of patients with NCC and the severity of the disease. The levels of the cytokines IL-1î, TNF-alpha, IL-5, IL-10 and IFN-gamma were determined in the CSF of 22 patients with active NCC, 13 patients with inactive NCC and 15 control subjects. CSF from patients with active NCC presented significantly higher IL-5 levels compared to control subjects. IL-5 and IL-10 levels in CSF from NCC patients with inflammatory CSF were significantly higher than those detected in non-inflammatory CSF. These results show a predominant Th2 lymphocyte activation in human NCC and also indicate the possible use of cytokines in the CSF as a marker for the differential diagnosis between inactive disease and the active form of NCC