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Additive effect of tumor necrosis factor-alpha and endotoxin on bilirubin cytotoxicity.

Pediatric research (1999-04-15)
K C Ngai, C Y Yeung
ZUSAMMENFASSUNG

Clinical observations suggest that sepsis may enhance the risk of kernicterus. This study investigated the combined effects of bilirubin, endotoxin, and tumor necrosis factor-alpha (TNF-alpha), which simulate sepsis in a jaundiced mouse fibroblast cell line. The horseradish peroxidase oxidation method was applied for bilirubin-albumin titration studies to test the effect of endotoxin and TNF-alpha on bilirubin-albumin binding. A modified 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide method was used to study cytotoxicity. Bilirubin caused cytotoxicity in a dose-dependent manner in the cultured mouse fibroblasts. Such an effect was significantly amplified by TNF-alpha and endotoxin. TNF-alpha and endotoxin had no effect on the bilirubin-albumin titration curves. Our results have shown that TNF-alpha and endotoxin increase the cytotoxicity of bilirubin. These findings provide supportive evidence that sepsis would increase the risk of tissue damage by bilirubin.

MATERIALIEN
Produktnummer
Marke
Produktbeschreibung

Sigma-Aldrich
Peroxidase aus Meerrettich, Type I, essentially salt-free, lyophilized powder, ≥50 units/mg solid (using pyrogallol)