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Signaling pathways controlling primordial germ cell migration in zebrafish
Karin Dumstrei1, Rebecca Mennecke, Erez Raz
1Germ Cell Development, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37070 Göttingen, Germany.
Journal of Cell Science
|September 2, 2004
Summary
Zebrafish primordial germ cell (PGC) migration relies on Gi-dependent signaling for direction, while phosphoinositide 3-kinase (PI3K) signaling impacts cell motility and morphology. This study clarifies distinct roles in directed cell movement.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- Zebrafish primordial germ cells (PGCs) migrate directionally guided by chemokine SDF-1a binding to its receptor CXCR4b.
- The intracellular mechanisms translating CXCR4b activation into directed migration remain largely unknown.
Purpose of the Study:
- To investigate the roles of G-protein-dependent and phosphoinositide 3-kinase (PI3K)-dependent signaling pathways in zebrafish PGC directional migration.
Main Methods:
- Inhibition of specific signaling pathways (Gi family G-proteins and PI3K) in zebrafish PGCs.
- Assessment of PGC migration directionality, motility, cell morphology, and filopodia stability.
- Analysis of phosphoinositide distribution during directed migration.
Main Results:
- Gi-dependent signaling is crucial for directional PGC migration but not overall motility.
- PI3K inhibition impairs PGC migration speed, alters cell morphology, and reduces filopodia stability.
- PI3K pathway products (phosphoinositides) are not polarized during directed migration, and their reduction does not affect directional ability.
Conclusions:
- Gi-dependent signaling is essential for the directional guidance of zebrafish PGC migration.
- The PI3K pathway is critical for PGC motility and maintaining cell shape during migration, rather than directionality.