Neuron-Glia Interaction in the Developing and Adult Enteric Nervous System

Area of Science:

• Neuroscience
• Developmental Biology
• Gastroenterology

Background:

• The enteric nervous system (ENS), the largest part of the peripheral nervous system, is crucial for gut function.
• ENS development involves complex cellular origins and migratory pathways.
• Understanding ENS neurogenesis and its role in homeostasis and allostasis is a growing research area.

Purpose of the Study:

• To review the developmental origins and neurogenetic capacity of the enteric nervous system.
• To explore the cellular sources and regulatory mechanisms of ENS development and regeneration.
• To discuss the potential of adult ENS progenitors in cell transplantation therapies.

Main Methods:

• Review of existing literature on ENS development, cell origins, and differentiation pathways.
• Analysis of signaling pathways (e.g., GDNF, EDN3, BMP, Hedgehog, Notch) involved in ENS formation.
• Discussion of potential cell sources for adult ENS regeneration and therapeutic applications.

Main Results:

• Enteric neural precursors originate from vagal and sacral neural crest, with contributions from Schwann cell precursors and pancreatic progenitors.
• Neural precursors include bipotent, neuronal-fated, and glial-fated subpopulations.
• Key molecules like GDNF and EDN3 guide precursor migration, while BMP, Hedgehog, and Notch signaling regulate differentiation.

Conclusions:

• The adult ENS exhibits regenerative potential through neurogenesis and gliogenesis.
• The precise origin of regenerating cells is debated, with candidates including progenitor populations, Schwann cell precursors, and transdifferentiating glia.
• Isolated adult ENS progenitors hold promise for cell transplantation therapies for enteric aganglionosis.