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Imaging filopodia dynamics in the mouse blastocyst
Enrique Salas-Vidal1, Hilda Lomelí
1Departamento de Fisiología Molecular y Genética del Desarrollo, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), A.P. 510-3, Cuernavaca, Morelos 62271, México.
Developmental Biology
|December 31, 2003
Summary
Researchers discovered long, thin filopodia connecting mural trophectoderm cells to the inner cell mass in mammalian blastocysts. These projections may transmit signals essential for cell division during development.
Area of Science:
- Developmental Biology
- Cell Biology
- Mammalian Embryogenesis
Background:
- Mammalian development involves early cell lineage diversification in the blastocyst, establishing the trophectoderm (TE) and inner cell mass (ICM).
- Mural TE cells, separated from the ICM by the blastocoel, differ from polar TE cells that remain in contact with the ICM.
Purpose of the Study:
- To investigate the presence and function of cell projections connecting the inner cell mass (ICM) with distant mural trophectoderm (mTE) cells.
- To characterize the morphology and potential signaling role of these projections during blastocyst development.
Main Methods:
- Observation of freshly dissected and in vitro cultured expanding mammalian blastocysts using videomicroscopy.
- Analysis of actin-based cell projections, including their behavior and associated vesicle-like structures.
- Immunolocalization of FGFR2 and ErbB3 receptors on these cell extensions.
Main Results:
- Identification of two types of actin-based filopodia: short, undulating projections and long, thin traversing filopodia.
- Observation of vesicle-like structures moving along traversing filopodia, indicating active transport.
- Localization of FGFR2 and ErbB3 receptors on traversing filopodia, suggesting signal transduction capabilities.
Conclusions:
- Traversing filopodia act as conduits for communication between distant mural TE cells and the ICM.
- These filopodia likely play a crucial role in transmitting signals necessary for mTE cell division, particularly after they become separated from the ICM.