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Tanaka, H; Sagisaka, A; Fujita, K; Kaneko, Y; Imanishi, S; Yamakawa, M
Insect molecular biology, February 2009, Volume: 18, Issue: 1Journal Article
Lipopolysaccharide (LPS), a major cell wall component of Gram-negative bacteria, was found to be unable to activate immune-related genes in Drosophila melanogaster. In contrast, highly purified LPS elicited immune-related gene expression in the fat body of Bombyx mori. However, the level of activation by highly purified LPS was lower than crude LPS and peptidoglycan. Furthermore, synthetic lipid A also activated these genes, suggesting that B. mori possesses unknown signal pathways to activate immune-related genes by LPS. Up-regulation of antimicrobial peptide genes by highly purified LPS was not confirmed in the immune-responsive cell line, NIAS-Bm-aff3, suggesting that some factors necessary for signal transduction activated by LPS are deficient in this cell line.
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