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We have investigated that synthetic lipid A subunit analogues (GLA compounds) as well as E. coli type lipopolysaccharide (LPS) and synthetic lipid A (compound 506) are able to stimulate human monocytes to release IL-1 in vitro. Of monosaccharide-type GLA compounds, GLA-60 was found to be more active for the induction of IL-1 production than GLA-59 and GLA-27, and similar to that of LPS or compound 506. GLA-60 could induce not only the secretion of IL-1 into culture supernatant but also the expression of membrane-associated form of IL-1 in human monocytes. Furthermore, no detectable IL-2 activity was observed in the culture supernatant. These results show that synthetic lipid A analogues of low toxicity, in particular GLA-60, are active in inducing IL-1 production in human monocytes.
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