title: Effect of Shigella toxin on preimplantation mouse embryos in vitro.
abstract: Preimplantation mouse embryos at the 4-cell to 8-cell stage were exposed to Shigella dysenteriae toxin at concentrations of 0.001-100 pg/ml in vitro. The effect of the toxin was studied by morphological observation of the embryos to the blastocyst stage, by assessing protein synthesis with 14C-leucine incorporation, and by measuring embryonic adenosine triphosphate (ATP) content. Preimplantation mouse embryos were highly sensitive to the toxin. All variables investigated were adversely influenced by the toxin. After a lag period of 24 hr, 0.01 pg/ml toxin inhibited development to the blastocyst stage and protein synthesis. Toxin concentrations of 1.0 pg/ml resulted in a significant decrease in ATP content.
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D001427:Bacterial Toxins / Q000633:toxicity*; D001755:Blastocyst / Q000187:drug effects / Q000378:metabolism; D004622:Embryo, Mammalian / Q000187:drug effects* / Q000378:metabolism; D047108:Embryonic Development; D005260:Female; D066298:In Vitro Techniques; D051379:Mice; D011247:Pregnancy; D014176:Protein Biosynthesis; D022603:Shiga Toxins; D013723:Teratogens
chemical_list: D001427:Bacterial Toxins; D022603:Shiga Toxins; D013723:Teratogens; D000255:Adenosine Triphosphate