Correlation between colonic secretion and colonic motility in rats: Role of ghrelin

Area of Science:

• Gastroenterology
• Physiology
• Endocrinology

Background:

• Colonic motility and secretory functions are critical for gut homeostasis.
• Ghrelin, a peptide hormone, is known to influence various physiological processes, including gastrointestinal function.

Purpose of the Study:

• To investigate the relationship between colonic secretory function and colonic motility.
• To explore the impact of intracerebroventricular (ICV) acyl ghrelin and des-acyl ghrelin on colonic functions.
• To determine the role of ICV injection volume in these responses.

Main Methods:

• Utilized a rat model with chronic intracerebroventricular (ICV) and cecal catheters.
• Administered acyl ghrelin and des-acyl ghrelin via ICV injection at different volumes (5 μL and 10 μL).
• Assessed colonic transit time, fecal output, and fecal weight.

Main Results:

• ICV acyl ghrelin (1 nmol/5 μL) enhanced fecal weight, accelerated colonic transit, and increased fecal output.
• ICV des-acyl ghrelin (1 nmol/5 μL) only accelerated colonic transit.
• These effects diminished with a 10 μL injection volume, and larger saline volumes also altered transit time.

Conclusions:

• Colonic secretion and motility do not consistently correlate under various colonic stimulations.
• Acyl ghrelin demonstrates a stimulatory effect on colonic secretion.
• The volume of ICV injection significantly influences the observed effects on colonic function.