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Characterization Of Binding And TNF-alpha-inducing Ability Of Chitosans On Monocytes: The Involvement Of CD14.
M. Otterlei, K. M. Vårum, L. Ryan, T. Espevik
Published 1994 · Biology, Medicine
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Chitosans with different chemical composition were found to induce TNF-alpha production from human monocytes. Their ability to induce TNF-alpha was found to be highly dependent on neutral-solubility and molecular weight. Monoclonal antibodies against CD14 inhibited TNF-alpha production from monocytes stimulated with neutral-soluble chitosans. Binding studies indicated that lipopolysaccharides (LPS) and neutral-soluble chitosans share a binding site on monocytes which involves CD14. TNF-alpha production from monocytes stimulated with chitosans was dependent on serum. LPS-binding protein (LBP) enhanced the chitosan-induced TNF-alpha production only to a minor degree, suggesting that serum proteins other than LBP play an important role in the stimulatory effect.
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