TY - JOUR
T1 - Molecular basis for lipopolysaccharide mimetic action of Taxol™ and flavolipin
AU - Kawasaki, Kiyoshi
AU - Gomi, Kazunori
AU - Kawai, Yohko
AU - Shiozaki, Masao
AU - Nishijima, Masahiro
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003
Y1 - 2003
N2 - We previously reported that Taxol™, which mimics the action of LPS on murine macrophages, induces signals via mouse TLR4/MD-2, but not via human TLR4/MD-2. Here we investigated the molecular basis for this species-specific action of Taxol™. Expression of mouse MD-2 conferred both LPS and Taxol™ responsiveness on HEK293 cells expressing mouse TLR4, whereas expression of human MD-2 conferred LPS responsiveness alone, suggesting that MD-2 is responsible for the species-specificity of Taxol™ responsiveness. Furthermore, mouse NM-2 mutants, in which Gln-22 was changed to other amino acids, showed dramatically reduced ability to confer Taxol™ responsiveness, although their ability to confer LPS responsiveness was not affected. These results indicated that Gln-22 of mouse MD-2 is essential for Taxol™ signaling, but not for LPS signaling. In this study, we also found that the TLR4/MD-2 complex, together with CD14, mediated signal transduction induced by flavolipin, an amino acid-containing lipid unique to Flavobacterium meningosepticum.
AB - We previously reported that Taxol™, which mimics the action of LPS on murine macrophages, induces signals via mouse TLR4/MD-2, but not via human TLR4/MD-2. Here we investigated the molecular basis for this species-specific action of Taxol™. Expression of mouse MD-2 conferred both LPS and Taxol™ responsiveness on HEK293 cells expressing mouse TLR4, whereas expression of human MD-2 conferred LPS responsiveness alone, suggesting that MD-2 is responsible for the species-specificity of Taxol™ responsiveness. Furthermore, mouse NM-2 mutants, in which Gln-22 was changed to other amino acids, showed dramatically reduced ability to confer Taxol™ responsiveness, although their ability to confer LPS responsiveness was not affected. These results indicated that Gln-22 of mouse MD-2 is essential for Taxol™ signaling, but not for LPS signaling. In this study, we also found that the TLR4/MD-2 complex, together with CD14, mediated signal transduction induced by flavolipin, an amino acid-containing lipid unique to Flavobacterium meningosepticum.
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U2 - 10.1179/096805103225002548
DO - 10.1179/096805103225002548
M3 - Article
C2 - 14577846
AN - SCOPUS:0141557898
VL - 9
SP - 301
EP - 307
JO - Journal of Endotoxin Research
JF - Journal of Endotoxin Research
SN - 1753-4259
IS - 5
ER -