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. 1996 Dec;64(12):4946–4951. doi: 10.1128/iai.64.12.4946-4951.1996

Soluble CD14 mediates lipopolysaccharide-induced intercellular adhesion molecule 1 expression in cultured human gingival fibroblasts.

J Hayashi 1, T Masaka 1, I Saito 1, I Ishikawa 1
PMCID: PMC174473  PMID: 8945531

Abstract

Intercellular adhesion molecule 1 (ICAM-1) is involved in the accumulation and activation of leukocytes in inflammatory diseases such as periodontitis. As reported previously, ICAM-1 is up-regulated on cultured human gingival fibroblasts (HGF) by exposure to lipopolysaccharide (LPS), suggesting a specific LPS recognition mechanism. We therefore investigated the role of CD14, an LPS receptor, in stimulation of HGF by LPS. Cell surface CD14 antigen was not observed on HGF by flow cytometric analysis. In addition, expression of CD14 mRNA in HGF was not detected by reverse transcription-PCR analysis. Since HGF did not express endogenous CD14, we investigated the role of human serum-derived soluble CD14 (sCD14) in ICAM-1 induction on HGF by LPS. The serum-dependent ICAM-1 induction by LPS was observed in HGF. In medium containing human serum, anti-CD14 antibody inhibited ICAM-1 induction on HGF by LPS. Depletion of sCD14 from human serum markedly reduced ICAM-1 expression on HGF in response to LPS. Supplementation of the serum-free medium with sCD14 alone restored the capacity of HGF to respond to LPS. These results show that induction of ICAM-1 in HGF by LPS does not involve binding to cell surface CD14 but is mediated by serum-derived sCD14.

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Selected References

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