title: Toxic effects of lipopolysaccharide from Bacteroides intermedius and Escherichia coli assessed in the pre-implantation mouse embryo culture system.
abstract: A comparative study on the toxic effects of endotoxin (lipopolysaccharide, LPS) from the strictly anaerobic Bacteroides intermedius BM1 and from Escherichia coli 055 was performed. Pre-implantation mouse embryos at the 2-cell stage from LPS responder (C57BL/6J) and low responder (C3H/Hej) mouse strains were exposed to the endotoxins, and development was observed during 72 h in vitro. Toxic effects of both endotoxins on embryos from both mouse strains were demonstrated. B. intermedius LPS was less toxic than E. coli LPS. The C3H/Hej embryos were more susceptible to endotoxins than the C57BL/6J embryos. A biphasic dose-response relationship was observed, as 100 micrograms/ml LPS was less embryotoxic than 1, 10 or 500 micrograms/ml, suggesting more complex mechanisms of effect than non-specific cell toxicity.
authors.forename: R
authors.initials: R
authors.lastname: Storeng
authors.forename: B
authors.initials: B
authors.lastname: Johne
mesh_terms: D000818:Animals; D001439:Bacteroides; D001755:Blastocyst / Q000502:physiology*; D002478:Cells, Cultured; D004926:Escherichia coli; D005260:Female; D008070:Lipopolysaccharides / Q000633:toxicity*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA
chemical_list: D008070:Lipopolysaccharides