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Amino acid transport in mouse blastocyst compartments
Journal of Embryology and Experimental Morphology
|October 1, 1985
Summary
Mouse blastocyst inner cell mass shows significant L-methionine transport, but uptake velocity is lower than the intact embryo. Most accumulated L-methionine is found in the blastocyst cavity.
Area of Science:
- Developmental Biology
- Cell Biology
- Embryology
Background:
- The blastocyst is a crucial stage in early mammalian development.
- Understanding nutrient transport is vital for embryonic development.
Purpose of the Study:
- To investigate L-methionine uptake and exchange properties in mouse blastocyst compartments.
- To characterize amino acid transport in the inner cell mass (ICM) versus the intact blastocyst.
Main Methods:
- Isolation of the inner cell mass (ICM) from mouse blastocysts using immunosurgery.
- Measurement of L-methionine transport kinetics (Vmax, Km) in isolated ICM and intact blastocysts.
- Localization of radiolabeled L-methionine within blastocyst compartments (cellular vs. cavity).
Main Results:
- The isolated ICM exhibits robust L-methionine exchange and efflux transport.
- ICM transport Vmax is lower, but Km is significantly higher than the intact blastocyst.
- Approximately 70% of accumulated L-methionine in the intact blastocyst resides within the blastocyst cavity.
Conclusions:
- The inner cell mass (ICM) has distinct L-methionine transport characteristics compared to the intact blastocyst.
- Blastocyst cavity plays a significant role in accumulating amino acids.
- These findings provide insights into nutrient dynamics during early embryonic development.