Regulation of Colonic Motility by Cystathionine γ-Lyase Neuron Remodeling

Area of Science:

• Gastroenterology
• Neuroscience
• Biochemistry

Background:

• Colitis involves colonic inflammation from various triggers, leading to unclear motility disorder mechanisms.
• Investigating the role of cystathionine γ-lyase (CSE) in colonic motility is crucial for understanding colitis.

Purpose of the Study:

• To explore the link between CSE expression in colonic neurons and motility dysfunction in a rat colitis model.
• To elucidate the role of hydrogen sulfide (H2S) in colitis-associated colonic hypomotility.

Main Methods:

• Established a rat model of colitis and assessed disease activity and fecal output.
• Utilized organ bath recordings, immunohistochemistry, immunocytochemistry, and Western blotting on colonic tissues and enteric nervous system (ENS) neurons.
• Examined CSE expression in various colonic layers and myenteric plexus neurons.

Main Results:

• Colitis induced reduced colonic motility and fecal pellet count.
• Inhibitors of hydrogen sulfide (H2S)-producing enzymes enhanced longitudinal muscle contractility in colitis.
• CSE expression was upregulated in the myenteric plexus neurons of colitis rats.

Conclusions:

• Upregulation of CSE and increased H2S production are implicated in decreased colonic motility during colitis.
• Endogenous H2S synthetase activity contributes to the pathophysiology of colonic hypomotility in colitis.