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Inhibition of mouse blastocyst attachment and outgrowth by protease inhibitors
Abstract:
Effects of protease inhibitors on development of mouse blastocysts and fibrinolytic activity of trophoblast were examined by growing embryos on monolayers of decidual cells in the presence of inhibitors. Nitrophenol-p-guanidino benzoate (NPGB) was the most effective inhibitor; 10(-4) M NPGB inhibited attachment and trophoblast outgrowth by 24% and 66%, respectively, and inhibited the fibrinolytic activity of trophoblast by 86%. The effects of NPGB were reversible, as demonstrated by the embryos' ability to attach and resume normal development when transferred to NPGB-free medium. Soybean trypsin inhibitor and epsilon-aminocaproic acid were less effective than NPGB in inhibiting blastocyst development. When 10(-4) M NPGB and 350 microgram/ml of soybean trypsin inhibitor were added together, blastocyst development and fibrinolytic activity were inhibited more severely than when either inhibitor was added alone. We suggest that at least two types of proteolytic activities in mouse blastocysts are involved in implantation, attachment requiring trypsin-like activity, and trophoblast outgrowth requiring both plasminogen activator and trypsin-like activity.
Insights
Protease inhibitors impact mouse blastocyst development and trophoblast fibrinolytic activity. Nitrophenol-p-guanidino benzoate (NPGB) significantly inhibited implantation and outgrowth, suggesting distinct proteolytic roles in early embryonic development.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Biochemistry
Background:
- Implantation is a critical process in mammalian reproduction.
- Trophoblast cells play a key role in embryo implantation and invasion.
- Proteolytic enzymes are implicated in facilitating trophoblast function during implantation.
Purpose of the Study:
- To investigate the effects of specific protease inhibitors on mouse blastocyst development.
- To examine the impact of these inhibitors on the fibrinolytic activity of trophoblast cells.
- To elucidate the roles of different proteolytic activities in blastocyst implantation and outgrowth.
Main Methods:
- Mouse blastocysts were cultured on decidual cell monolayers in the presence of various protease inhibitors.
- Inhibitors tested included Nitrophenol-p-guanidino benzoate (NPGB), soybean trypsin inhibitor, and epsilon-aminocaproic acid.
- Inhibition of attachment, trophoblast outgrowth, and fibrinolytic activity were quantified.
Main Results:
- 10(-4) M NPGB significantly inhibited blastocyst attachment (24%) and trophoblast outgrowth (66%), and reduced trophoblast fibrinolytic activity by 86%.
- The inhibitory effects of NPGB were reversible upon transfer to a drug-free medium.
- Combined treatment with NPGB and soybean trypsin inhibitor resulted in more severe inhibition than either agent alone.
Conclusions:
- Mouse blastocyst implantation involves at least two distinct proteolytic activities.
- Trypsin-like activity is essential for blastocyst attachment.
- Plasminogen activator and trypsin-like activity are both required for trophoblast outgrowth.