Control of pathfinding by the avian trunk neural crest

Area of Science:

• Developmental Biology
• Cell Biology
• Neuroscience

Background:

• Neural crest cells are crucial for vertebrate development, forming diverse cell types.
• Understanding their migration pathways and regulatory mechanisms is fundamental to developmental biology.

Purpose of the Study:

• To determine the migratory pathways of trunk neural crest cells in quail embryos.
• To identify the molecular and cellular parameters controlling neural crest cell dispersion patterns.

Main Methods:

• Utilized HNK-1 antibodies to identify migratory neural crest cells.
• Performed in vitro cell culture and three-dimensional gel assays.
• Conducted grafting experiments to assess migratory potential in ectopic sites.

Main Results:

• Identified three primary neural crest cell migration pathways: between ectoderm/somites, within intersomitic spaces, and through anterior somites.
• Demonstrated that laminin and fibronectin in the extracellular matrix promote neural crest cell adhesion and migration.
• Showed that basal laminae act as barriers, constraining cell movement, while hyaluronic acid may facilitate migration by creating space.

Conclusions:

• Neural crest cell migration pathways are defined by a combination of adhesive molecules, extracellular matrix barriers, and cell-intrinsic properties.
• Contact inhibition likely directs cell migration, while chemotaxis and haptotaxis play minor roles.
• Neural crest cells possess an inherent ability to disperse, aided by plasminogen activator production and substrate traction.