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pubmed-article:11201057pubmed:abstractTextMicrotubules are obligate functional elements of almost all eukaryotic cells. They are involved in a broad range of essential cellular functions and structural changes of this system may trigger cell death. Recently, we have reported that lipopolysaccharides inhibit in vitro microtubule formation due to exclusion of microtubule-associated proteins. The distinct epitopes of lipopolysaccharides responsible for these effects and the in vivo relevance of these data are unknown. Therefore, this study was conducted to elucidate the effects of lipid A, the biologically active motif of lipopolysaccharides, on microtubule formation in vitro and to prove whether lipopolysaccharides affect the microtubule architecture of cultured human monocytes in vivo. Despite a dose- and pH-dependent inhibition of microtubule formation by lipopolysaccharides, inhibition of microtubule assembly could be mimicked by lipid A. Near-infrared two-photon microscopy revealed that human peripheral blood monocytes accumulate lipopolysaccharides. A vesicular distribution pattern of lipopolysaccharides within the monocytes was observed. Confocal laser scanning microscopy demonstrated alterations in the microtubule architecture of monocytes after incubation with lipopolysaccharides. Lipid A seems to be responsible for the observed crosstalk between lipopolysaccharides and microtubule proteins. Furthermore, our data indicate that lipopoly-saccharides may affect the microtubule architecture in human monocytes after intracellular accumulation directly. Therefore, we conclude, that the microtubule cytoskeleton is an essential intracellular target for sepsis-relevant bacterial components such as lipopolysaccharides.lld:pubmed
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pubmed-article:11201057pubmed:authorpubmed-author:KönigKKlld:pubmed
pubmed-article:11201057pubmed:authorpubmed-author:BöhmK JKJlld:pubmed
pubmed-article:11201057pubmed:authorpubmed-author:MühligPPlld:pubmed
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pubmed-article:11201057pubmed:authorpubmed-author:WiederholdMMlld:pubmed
pubmed-article:11201057pubmed:authorpubmed-author:RusswurmSSlld:pubmed
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pubmed-article:11201057pubmed:volume16lld:pubmed
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pubmed-article:11201057pubmed:pagination339-46lld:pubmed
pubmed-article:11201057pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11201057pubmed:articleTitleLipopolysaccharide induces distinct alterations in the microtubule cytoskeleton of monocytes.lld:pubmed
pubmed-article:11201057pubmed:affiliationUniversity of Jena, Department of Anaesthesiology and Critical Care Medicine, Germany. russwurm@med.uni-jena.delld:pubmed
pubmed-article:11201057pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11201057pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed