Human neural crest induction by temporal modulation of WNT activation

Area of Science:

• Developmental biology
• Stem cell research
• Human neural crest cell differentiation

Background:

• Human neural crest cell development is challenging to study due to technical and ethical limitations.
• Pluripotent stem cells offer a promising model for investigating human neural crest development.
• Previous work established a rapid, chemically defined method for neural crest induction via WNT/β-CATENIN activation.

Purpose of the Study:

• To determine the optimal duration of WNT/β-CATENIN pathway activation for inducing human neural crest cells.
• To define the temporal window of competence for neural crest induction from ectodermal precursors.
• To assess the cost-effectiveness and scalability of the optimized induction protocol.

Main Methods:

• Utilizing pluripotent stem cells and a GSK3 inhibitor to modulate WNT/β-CATENIN signaling.
• Systematically varying the duration of GSK3 inhibition to control WNT pathway activation.
• Assessing neural crest induction by evaluating differentiation into specific neural crest fates (neurons, glia, melanoblasts, osteocytes, chondrocytes, adipocytes).
• Determining the critical time window for inducing neural crest cells from non-neural ectodermal/placodal precursors.

Main Results:

• A 2-day pulse of WNT/β-CATENIN activation via GSK3 inhibition is sufficient to generate bona fide neural crest cells.
• These induced cells differentiate into a wide range of neural crest-specific cell types.
• The window of competence for neural crest induction closes by day 3 of culture.
• Optimal induction occurs when WNT activation begins at the start of the culture period.
• The reduced WNT activation requirement makes the process more cost-effective.

Conclusions:

• A short, 2-day pulse of WNT/β-CATENIN activation is optimal for efficient human neural crest induction from pluripotent stem cells.
• This optimized protocol defines the critical temporal window for neural crest induction, closing by day 3.
• The cost-effective and scalable 2D method is suitable for various culture platforms, facilitating broader research applications.