Inflammatory Cytokine Profile in Children With Severe Acute Respiratory Syndrome




* Departments of Paediatrics
Chemical Pathology
Microbiology, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
Objective. To study the inflammatory cytokine profile in children with severe acute respiratory syndrome (SARS) and to investigate whether monoclonal antibody to tumor necrosis factor-
(TNF-
) could be considered for treatment of these patients.
Methods. Plasma inflammatory cytokine concentrations (interleukin [IL]-1ß, IL-6, IL-8, IL-10, IL-12p70, and TNF-
) were monitored longitudinally on admission, immediately before corticosteroids, and 1 to 2 days and 7 to 10 days after the drug treatment in a cohort of pediatric patients (n = 8) with virologic confirmed SARS-associated coronavirus infection. None of the patients required mechanical ventilation or intensive care treatment. All children except 1 (patient 3) received corticosteroids.
Results. Plasma IL-1ß levels (excluding patient 3) were substantially elevated immediately before (range: 7721 ng/L) and 7 to 10 days after (range: 7664 ng/L) corticosteroid treatment. In contrast, the plasma concentrations of other key proinflammatory cytokines, including IL-6 and TNF-
, were not overtly increased in any of the patients throughout the course of illness. In addition, plasma IL-10 concentration was significantly lower 1 to 2 days and 7 to 10 days after corticosteroid treatment, compared with the immediate pretreatment level. Similarly, plasma IL-6 and IL-8 concentrations were significantly decreased 7 to 10 days after the drug treatment.
Conclusions. Pediatric SARS patients have markedly elevated circulating IL-1ß levels, which suggests selective activation of the caspase-1-dependent pathway. Other key proinflammatory cytokines, IL-6 and TNF-
, showed only mildly elevated levels at the initial phase of the illness. The current evidence does not support the use of TNF-
monoclonal antibody in this group of children.
Key Words: children cytokines SARS
Abbreviations: SARS, severe acute respiratory syndrome SARS-CoV, SARS-associated coronavirus ARDS, acute respiratory distress syndrome TNF-
, tumor necrosis factor-
IL, interleukin RSV, respiratory syncytial virus
Received for publication Jul 31, 2003; Accepted Oct 1, 2003.
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