GDNF is a chemoattractant for enteric neural cells.

Area of Science:

• Developmental Biology
• Neuroscience
• Gastroenterology

Background:

• Glial cell line-derived neurotrophic factor (GDNF) is crucial for neural development.
• Understanding GDNF's role in enteric nervous system formation is vital for developmental studies.

Purpose of the Study:

• To investigate the spatiotemporal expression of GDNF mRNA in embryonic mouse gut.
• To determine the effect of exogenous GDNF on the migration and differentiation of enteric neural crest-derived cells.
• To assess GDNF's chemoattractant properties for neural crest cells in various embryonic tissues.

Main Methods:

• In situ hybridization to detect GDNF mRNA expression in embryonic mouse gut.
• Catenary organ culture of embryonic mouse hindgut explants with and without GDNF.
• Chemotaxis assays using GDNF-impregnated agarose beads and explants from different embryonic tissues.

Main Results:

• GDNF mRNA expression increased significantly in the mid- and hindgut mesenchyme after embryonic day 11.5.
• Exogenous GDNF reduced neuron development within hindgut explants but increased migration of neural crest cells outside the explant.
• Neural crest cells and neurites from the esophagus and midgut exhibited chemotaxis towards GDNF, while other neural tissues showed minimal response.

Conclusions:

• GDNF acts as a chemoattractant for enteric neural crest-derived cells, guiding their migration within the gastrointestinal tract.
• GDNF may prevent neural crest cells from migrating into surrounding tissues like the mesentery.
• GDNF promotes directed axon outgrowth and plays a significant role in enteric nervous system development.