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Identification of two distinct functions for TGF-beta in early mouse development
B A Roelen1, M J Goumans, A Zwijsen
1Hubrecht Laboratory, Netherlands Institute for Developmental Biology, Utrecht, The Netherlands.
Differentiation; Research in Biological Diversity
|January 28, 1999
Summary
Transforming growth factor-beta (TGF-beta) signaling is crucial for early mouse embryo development. Blocking TGF-beta hinders embryo growth, while it regulates parietal endoderm outgrowth in blastocysts.
Area of Science:
- Developmental Biology
- Cell Signaling
Background:
- Transforming growth factor-beta (TGF-beta) is a key signaling molecule.
- Its role in preimplantation mouse embryo development requires further elucidation.
Purpose of the Study:
- To investigate the function of TGF-beta signaling in preimplantation mouse embryos.
- To identify the specific roles of TGF-beta at different developmental stages.
Main Methods:
- Reverse transcription polymerase chain reaction (RT-PCR) to detect TGF-beta receptor mRNA.
- In vitro culture of isolated inner cell masses with and without TGF-beta.
- Injection of a dominant-negative TGF-beta receptor construct into oocytes.
Main Results:
- mRNA for TGF-beta receptors (T beta R-I and T beta R-II) was detected in oocytes and blastocysts.
- Blocking TGF-beta signaling in oocytes impaired embryo development beyond the two-cell stage.
- TGF-beta influenced the outgrowth of parietal endoderm from blastocyst-stage inner cell masses.
Conclusions:
- TGF-beta signaling, mediated by maternal receptors, is essential for preimplantation mouse embryo development.
- TGF-beta plays a regulatory role in the differentiation of parietal endoderm.