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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.
Insights
Shigella dysenteriae toxin severely impacts early mouse embryo development. Even low toxin concentrations inhibit blastocyst formation, protein synthesis, and reduce adenosine triphosphate (ATP) levels.
Area of Science:
- Reproductive Biology
- Toxicology
- Developmental Biology
Background:
- Shigella dysenteriae toxin is a potent bacterial toxin.
- Early embryonic development is a critical period sensitive to environmental insults.
Purpose of the Study:
- To investigate the in vitro effects of Shigella dysenteriae toxin on preimplantation mouse embryo development.
- To determine the sensitivity of early mouse embryos to varying concentrations of the toxin.
Main Methods:
- Exposure of 4-cell to 8-cell stage mouse embryos to Shigella dysenteriae toxin (0.001-100 pg/ml).
- Morphological assessment of embryo development to the blastocyst stage.
- Measurement of protein synthesis via 14C-leucine incorporation.
- Quantification of embryonic adenosine triphosphate (ATP) content.
Main Results:
- Preimplantation mouse embryos exhibited high sensitivity to the toxin.
- A lag period of 24 hours was observed before toxic effects manifested.
- Toxin concentrations as low as 0.01 pg/ml inhibited blastocyst development and protein synthesis.
- Toxin concentrations of 1.0 pg/ml significantly decreased embryonic ATP content.
Conclusions:
- Shigella dysenteriae toxin adversely affects multiple crucial aspects of early mouse embryo development.
- The toxin disrupts key metabolic pathways and developmental processes at very low concentrations.
- These findings highlight the potential risks of bacterial toxins to reproductive outcomes.