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CLINICAL TRIAL
CONTROLLED CLINICAL TRIAL
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Circulating erythropoietin and interleukin-6 concentrations increase in critically ill children with sepsis and septic shock.
Critical Care Medicine 1996 September
OBJECTIVES: To investigate a possible relationship between plasma erythropoietin and interleukin-6 (IL-6) in critically ill children with sepsis or septic shock. To examine the modulatory effects of plasma from these patients on erythropoietin production in vitro, employing a cell culture system that uses the erythropoietin-producing Hep 3B cell line.
DESIGN: A prospective, controlled clinical and laboratory study.
SETTING: A pediatric intensive care unit and research laboratory facility at a children's hospital.
PATIENTS: Children admitted to the pediatric intensive care unit with the diagnosis of sepsis or septic shock (n = 16), and control patients without infection or anemia (n = 16) were admitted to the study.
INTERVENTIONS: None.
MEASUREMENTS AND MAIN RESULTS: Blood samples were obtained from 16 children with sepsis or septic shock, and 16 age-matched controls. Plasma erythropoletin and IL-6 concentrations were measured using an enzyme-linked immunoassay. Plasma erythropoietin concentrations were significantly higher in children with sepsis or septic shock (120 +/- 26 mlU/mL) than in controls (10 +/- 2 mlU/mL) (p < .001). Plasma IL-6 concentrations were greater in children diagnosed with sepsis or septic shock (12,405 +/- 6662 pg/mL) than in control patients (7 +/- 1 pg/mL) (p < .001), and higher in septic shock patients (27,469 +/- 13,647 pg/mL) than sepsis patients (688 +/- 258 pg/mL) (p = .03). Hep 3B cells were incubated under hypoxic conditions in media containing plasma from control patients, or patients diagnosed with sepsis or septic shock. Media concentrations of erythropoietin were measured using an enzymelinked immunoassay. Hep 3B cells incubated with plasma from patients diagnosed with sepsis or septic shock produced more erythropoietin (216 +/- 23 mlU/mL) than Hep 3B cells incubated under the same conditions in media containing plasma from control patients (152 +/- 11 mlU/mL) (p = .04). Hypoxic Hep 3B cell erythropoietin production in media incubated with plasma from patients diagnosed with sepsis or septic shock correlated significantly (although weakly) with plasma IL-6 values from these same patients (p = .03, r2 = .28).
CONCLUSIONS: Plasma erythropoietin and IL-6 values are increased in critically ill children with sepsis or septic shock in comparison with controls. The data indicate that one or more plasma factors are responsible for stimulation of hypoxia-induced erythropoietin production in the Hep 3B cell line and suggest a possible role for IL-6 in the regulation of erythropoletin production in critically ill children with sepsis or septic shock.
DESIGN: A prospective, controlled clinical and laboratory study.
SETTING: A pediatric intensive care unit and research laboratory facility at a children's hospital.
PATIENTS: Children admitted to the pediatric intensive care unit with the diagnosis of sepsis or septic shock (n = 16), and control patients without infection or anemia (n = 16) were admitted to the study.
INTERVENTIONS: None.
MEASUREMENTS AND MAIN RESULTS: Blood samples were obtained from 16 children with sepsis or septic shock, and 16 age-matched controls. Plasma erythropoletin and IL-6 concentrations were measured using an enzyme-linked immunoassay. Plasma erythropoietin concentrations were significantly higher in children with sepsis or septic shock (120 +/- 26 mlU/mL) than in controls (10 +/- 2 mlU/mL) (p < .001). Plasma IL-6 concentrations were greater in children diagnosed with sepsis or septic shock (12,405 +/- 6662 pg/mL) than in control patients (7 +/- 1 pg/mL) (p < .001), and higher in septic shock patients (27,469 +/- 13,647 pg/mL) than sepsis patients (688 +/- 258 pg/mL) (p = .03). Hep 3B cells were incubated under hypoxic conditions in media containing plasma from control patients, or patients diagnosed with sepsis or septic shock. Media concentrations of erythropoietin were measured using an enzymelinked immunoassay. Hep 3B cells incubated with plasma from patients diagnosed with sepsis or septic shock produced more erythropoietin (216 +/- 23 mlU/mL) than Hep 3B cells incubated under the same conditions in media containing plasma from control patients (152 +/- 11 mlU/mL) (p = .04). Hypoxic Hep 3B cell erythropoietin production in media incubated with plasma from patients diagnosed with sepsis or septic shock correlated significantly (although weakly) with plasma IL-6 values from these same patients (p = .03, r2 = .28).
CONCLUSIONS: Plasma erythropoietin and IL-6 values are increased in critically ill children with sepsis or septic shock in comparison with controls. The data indicate that one or more plasma factors are responsible for stimulation of hypoxia-induced erythropoietin production in the Hep 3B cell line and suggest a possible role for IL-6 in the regulation of erythropoletin production in critically ill children with sepsis or septic shock.
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