Enteric neural crest cells regulate vertebrate stomach patterning and differentiation

Area of Science:

• Developmental biology
• Gastrointestinal biology
• Neuroscience

Background:

• Vertebrate digestive tract development involves epithelial-mesenchymal interactions for regional patterning.
• Vagal enteric neural crest cells (vENCCs) colonize the primitive GI tract to form the enteric nervous system (ENS).
• The role of vENCCs in early GI tract patterning and differentiation remains largely unexplored.

Purpose of the Study:

• To investigate the influence of vENCCs on early chick stomach development, patterning, and differentiation.
• To elucidate the molecular mechanisms by which vENCCs regulate stomach development.
• To determine the necessity of a critical vENCC number for maintaining stomach identity.

Main Methods:

• Vagal enteric neural crest cell (vENCC) ablation in chick embryos.
• Analysis of BMP and Notch signaling pathway activation in stomach mesenchyme.
• Assessment of smooth muscle development and tissue phenotype.
• Investigation of Notch signaling pathway activity in vENCC-ablated stomachs.

Main Results:

• Reduced vENCC numbers led to sustained activation of BMP and Notch pathways in the stomach mesenchyme.
• vENCC ablation impaired smooth muscle development and caused stomach-to-intestinal transdifferentiation.
• Sustained Notch signaling in the mesenchyme mimicked the defects observed after vENCC ablation.

Conclusions:

• A critical number of vENCCs is essential for proper chick stomach development, patterning, and differentiation.
• vENCCs regulate stomach development by inhibiting Notch signaling in the mesenchyme.
• vENCCs act as a novel mediator in mesenchymal-epithelial interactions, controlling stomach identity and differentiation.