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Metalloproteinases regulate parietal endoderm differentiating and migrating in cultured mouse embryos
1Department of Anatomy, University of California, San Francisco 94143-0750, USA.
Summary
Metalloproteinase inhibitors promote embryonic cell migration along extracellular matrix (ECM) surfaces by preserving ECM's migration-inducing properties, distinct from their role in invasion.
Area of Science:
- Developmental Biology
- Cell Biology
- Extracellular Matrix Research
Background:
- Extracellular matrix (ECM) adhesion and proteolysis are crucial for embryonic development.
- Gelatinase B activity was previously identified as rate-limiting for trophoblast invasion and ECM degradation.
- Parietal endoderm (PE) is the first embryonic cell type to migrate along ECM surfaces.
Purpose of the Study:
- To investigate the distinct roles of matrix metalloproteinases (MMPs) in cell migration along ECM versus invasion through ECM.
- To elucidate the role of ECM proteolysis in the differentiation and migration of parietal endoderm (PE).
Main Methods:
- Utilized cultures of inner cell masses (ICMs) isolated from mouse blastocysts.
- Administered metalloproteinase inhibitors, specifically tissue inhibitor of metalloproteinases (TIMP)-1 and a peptide hydroxamic acid.
- Analyzed PE differentiation marker vimentin expression and cell migration distances on fibronectin-coated substrates.
Main Results:
- TIMP-1 and a peptide hydroxamic acid stimulated PE outgrowth and differentiation from ICMs cultured on fibronectin.
- TIMP-1 increased PE cell number and migration distance, and vimentin expression, without affecting other cell types.
- The stimulatory effect of TIMP-1 was more pronounced on lower concentrations of fibronectin.
Conclusions:
- Metalloproteinase inhibitors preserve the ECM's migration-inducing capacity, facilitating cell movement along ECM surfaces.
- Metalloproteinases play distinct roles in invasive activity through ECM barriers compared to migratory activity along ECM surfaces.