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Abstract

We have demonstrated that egg-white lysozyme (EW-LZM) bound to lipopolysaccharide (LPS), reduced the lethal toxicity and the biological activity of LPS. In this study, the interaction of LPS with murine lysozyme (M-LZM) and the modulation of biological activities were investigated. M-LZM was prepared from the culture supernatant of the murine macrophage cell line RAW264.7 by ion-exchange and gel filtration chromatographies and dialysis. Two types of M-LZM, murine M lysozyme (MM-LZM) and murine P lysozyme (MP-LZM), were purified from the supernatant. The enzymatic activities of both MM-LZM and MP-LZM were inhibited by LPS and their effects were affected by the temperature and the ionic strength. TNF-α production from RAW264.7 by LPS was inhibited by mixing with MM-LZM and MP-LZM. MP-LZM inhibited TNF-α production stronger than MM-LZM. Considering these facts, we suggested that M-LZM, like EW-LZM, make a complex with LPS to reduce the toxicity of LPS together with inhibiting the enzymatic activity.

Lipopolysaccharide, Murine lysozyme, Tumor necrosis factor-α, Endotoxin

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© 1996 Federation of European Microbiological Societies.
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