Chicken primordial germ cell motility in response to stem cell factor sensing

Area of Science:

• Developmental Biology
• Cell Biology
• Reproductive Biology

Background:

• Avian primordial germ cells (PGCs) migrate from extraembryonic regions to gonadal ridges via the vascular system.
• The precise mechanisms and factors governing PGC migration are not fully understood.
• Understanding PGC migration is crucial for ensuring genetic continuity.

Purpose of the Study:

• To investigate the chemotactic effect of stem cell factor (SCF) on chicken blood circulating PGCs (cPGCs).
• To elucidate the role of SCF/c-kit signaling in PGC migration in vitro.

Main Methods:

• Utilized 3D chemotaxis slides and time-lapsed imaging for in vitro analysis of cPGCs.
• Exposed cPGCs to a stem cell factor (SCF) gradient.
• Assessed migration parameters, cell polarization, and membrane protrusions; used c-kit inhibitor STI571 for validation.

Main Results:

• 77.1% of cPGCs responded to SCF, with 48.1% exhibiting polarization and directional migration.
• SCF-treated cPGCs showed significant differences in migration velocity, distance, and eccentricity compared to controls.
• Pretreatment with a c-kit inhibitor (STI571) completely blocked SCF-induced responses, and cPGCs expressed c-kit.

Conclusions:

• Stem cell factor (SCF) acts as a chemoattractant for chicken primordial germ cells (cPGCs).
• The SCF/c-kit signaling pathway is involved in mediating cPGC chemotactic migration.
• This finding provides critical insights into the molecular mechanisms of germ cell migration.