Endotoxin-mediated endothelial cell injury and activation: Role of soluble CD14

M. Arditi, J. Zhou, R. Dorio, Wei Rong Guo Wei Rong, S. M. Goyert, Sik Kim Kwang Sik Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Vascular endothelial cell (EC) injury by lipopolysaccharides (LPS) plays a major role in the pathogenesis of gram-negative bacterial sepsis and endotoxic shock. The studies described here were performed to define further the molecular mechanisms involved in the EC responses to LPS. We showed that serum was required for LPS-mediated cytotoxicity for bovine brain microvessel, pulmonary, and aortic ECs and that anti-human CD14 antibodies completely blocked LPS-mediated cytotoxicity for ECs in the presence of human serum. The addition of a recombinant soluble form of human CD14 to serum- free medium restored the LPS-mediated cytotoxicity, whereas the addition of LPS binding protein (LBP), a serum protein that potentiates LPS-induced responses to monocytes, had no effect. A similar dependency on serum or recombinant soluble CD14 (under serum-free conditions) was observed for LPS- induced secretion of interleukin-6 by human umbilical vein ECs. These findings indicate that soluble CD14 is required for LPS-mediated EC responses independently of LPB, suggesting that serum soluble CD14 represents a naturally occurring agonist for EC responses to LPS.

Original languageEnglish (US)
Pages (from-to)3149-3156
Number of pages8
JournalInfection and immunity
Volume61
Issue number8
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

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