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A functional overlap of plasminogen and MMPs regulates vascularization during placental development
Helene Solberg1, Julie Rinkenberger, Keld Danø
1Finsen Laboratory, Rigshospitalet, Strandboulevarden 49, 2100 Copenhagen, Denmark.
Abstract:
Both plasminogen activators and matrix metalloproteinases (MMPs) have been implicated in a variety of developmental processes in the mouse during embryo implantation and placentation. We show here that pharmacological treatment of plasminogen-deficient mice with the broad spectrum MMP inhibitor galardin leads to a high rate of embryonic lethality. Implantation sites from plasminogen-deficient galardin-treated mice at 7.5 days post coitus (dpc) showed delay in both decidualization and invasion of maternal vessels into the decidua. At 8.5 dpc, half of the embryos were runted and still at the developmental stage of a 7.5 dpc embryo. Most embryos that escaped these initial defects eventually died, probably from defective vascularization and development of the labyrinth layer of the placenta, although a direct role on embryo development cannot be ruled out. These results demonstrate that the combination of MMPs and plasminogen is essential for the proper development of the placenta. Plasminogen deficiency alone and galardin treatment alone had much less effect and there was a pronounced synergism on both placental vascularization and embryonic lethality, indicating a functional overlap between plasminogen and MMPs.
Insights
Matrix metalloproteinases (MMPs) and plasminogen are crucial for placental development. Inhibiting MMPs in plasminogen-deficient mice caused severe embryonic lethality, highlighting their synergistic roles in pregnancy.
Area of Science:
- Reproductive biology
- Developmental biology
- Biochemistry
Background:
- Plasminogen activators and matrix metalloproteinases (MMPs) are involved in mouse embryo implantation and placentation.
- The specific roles and interactions of these enzymes during early pregnancy are not fully understood.
Purpose of the Study:
- To investigate the combined effects of plasminogen deficiency and MMP inhibition on embryonic development and placentation in mice.
- To elucidate the functional overlap and essentiality of MMPs and plasminogen in placental vascularization and embryonic survival.
Main Methods:
- Pharmacological treatment of plasminogen-deficient mice with galardin, a broad-spectrum MMP inhibitor.
- Histological analysis of implantation sites at 7.5 and 8.5 days post coitus (dpc).
- Assessment of embryonic development, decidualization, maternal vascular invasion, and placental vascularization.
Main Results:
- Pharmacological inhibition of MMPs in plasminogen-deficient mice resulted in a high rate of embryonic lethality.
- Implantation sites showed delayed decidualization and reduced invasion of maternal vessels.
- Embryos exhibited runting and developmental delays, with subsequent death likely due to defective placental vascularization.
Conclusions:
- The combination of MMPs and plasminogen is essential for proper placental development and embryonic survival.
- A pronounced synergism exists between plasminogen and MMPs, indicating a significant functional overlap in placental vascularization and preventing embryonic lethality.