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Hypoxia/reoxygenation stimulates endothelial cells to promote interleukin-1 and interleukin-6 production. Effects of free radical scavengers

  • Molecular Immunopathology
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Abstract

Vascular endothelium produces and/or interferes with various cytokines. Previous studies have demonstrated interactions of these inflammatory and immunological mediators with oxygen-derived free radicals. The present work examines the relationship between hypoxia/reoxygenation (H/R) and cytokine production by cultured endothelial cells. Human umbilical vein endothelial cell (HUVEC) monolayers were incubated for 24 h in normoxia or submitted to 5 h hypoxia/19 h reoxygenation. Then, interleukin-1 (IL-1) α and β, and interleukin-6 (IL-6), were measured in culture supernatants by specific enzyme immunoassays and bioassays, respectively.

Under these conditions, the spontaneous production of IL-1 and IL-6, detected in normoxic HUVEC, greatly increased after H/R treatment. The observed enhancement was cycloheximide-sensitive and, consequently, reflected ade novo protein synthesis. Superoxide dismutase and glutathione peroxidase prevented H/R-induced IL-1 and IL-6 increase. These results constitute the first demonstration that H/R stimulates HUVEC to promote IL-1 and IL-6 production and strongly suggest a role for oxygen-derived free radicals in the cytokine synthesis.

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Ala, Y., Palluy, O., Favero, J. et al. Hypoxia/reoxygenation stimulates endothelial cells to promote interleukin-1 and interleukin-6 production. Effects of free radical scavengers. Agents and Actions 37, 134–139 (1992). https://doi.org/10.1007/BF01987902

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