Organ-specific Sympathetic Innervation Defines Visceral Functions

Area of Science:

• Neuroscience
• Molecular Biology
• Physiology

Background:

• The autonomic nervous system regulates vital bodily functions via sympathetic and parasympathetic pathways.
• Current understanding of the sympathetic nervous system at cellular and molecular levels is limited.

Purpose of the Study:

• To investigate the cellular and molecular organization of the abdominal sympathetic nervous system.
• To identify distinct sympathetic neuron populations within the celiac-superior mesenteric ganglia (CG-SMG).

Main Methods:

• Multi-modal transcriptomic analysis of the CG-SMG.
• Spatial mapping of sympathetic neuron populations.
• Neural perturbation experiments to assess functional roles.

Main Results:

• Identified distinct, spatially and molecularly separable sympathetic populations in the CG-SMG.
• Demonstrated selective axonal projections from CG-SMG populations to specific visceral organs (GI tract, pancreas, bile tract).
• Showed functional segregation, with distinct neuron classes regulating GI motility versus digestion and glucagon secretion.

Conclusions:

• The sympathetic nervous system exhibits molecular diversity with functionally segregated neuron populations.
• Modular regulation of visceral organ functions is achieved through distinct sympathetic pathways.
• This study provides novel insights into the cellular and molecular basis of autonomic control.