Abstract
We show that in two cell lines of human squamous cell carcinoma (SCC) which slightly express intercellular adhesion molecule-1 (ICAM-1), the expression is enhanced not only by interferon-γ (IFN-γ) and tumor necrosis factor-α (TNF-α) but also by interleukin-1 (IL-1) and lipopolysaccharide (LPS). This expression is totally dependent on the increase of ICAM-1 mRNA. This evidence contrasts with previously reported findings indicating that, in human cultured keratinocytes, ICAM-1 expression is induced by IFN-γ and TNF-α, and not by either IL-1 or LPS. This result suggests that various cytokines or agents easily enhance ICAM-1 expression in SCC cell lines, and may explain the clinical finding that ICAM-1 expression increases according to the progression of malignant tumors.
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