How Smooth Muscle Contractions Shape the Developing Enteric Nervous System

Area of Science:

• Developmental biology
• Neuroscience
• Biophysics

Background:

• The enteric nervous system (ENS) is crucial for gut function.
• ENS development is influenced by mechanical forces from gut motility.
• Understanding these forces is key to comprehending ENS morphogenesis.

Purpose of the Study:

• To investigate how gut smooth muscle contractions impact the developing fetal ENS.
• To elucidate the role of mechanical stress in ENS network formation.

Main Methods:

• Studied chicken and mouse embryos.
• Imaged ENS deformations during spontaneous myogenic motility.
• Utilized mechanical finite element modeling.
• Performed organ culture experiments to suppress contractile waves.

Main Results:

• The number of enteric ganglia is established early in development.
• ENS morphogenesis involves anisotropic expansion of existing neural networks.
• Circular smooth muscle contractions induce longitudinal strain on the ENS.
• Suppression of contractile waves eliminated ENS longitudinal anisotropy.

Conclusions:

• Gut muscle contractions are a primary driver of ENS network sculpting.
• Mechanical forces play a critical role in fetal ENS development and morphogenesis.
• ENS development relies on the expansion of a pre-established lattice, not de novo ganglion formation.