[Hormonal control of intestinal motility]

Area of Science:

• Gastroenterology
• Endocrinology
• Physiology

Background:

• Digestive hormones play a crucial role in regulating gastrointestinal (GI) motor patterns in humans.
• The postprandial state exhibits irregular contractions, linked to elevated levels of 8-10 digestive hormones.

Purpose of the Study:

• To investigate the physiological roles of specific digestive hormones in regulating the typical
• fed
• and
• fasted
• gastrointestinal motor profiles.
• To explore the involvement of hormones like insulin, gastrin, neurotensin, CCK8, motilin, somatostatin, and pancreatic polypeptide in GI motility regulation.

Main Methods:

• Systemic infusion of identified digestive hormones (insulin, gastrin, neurotensin, CCK8) to observe effects on GI motility.
• Monitoring plasma levels of various digestive hormones during fasted and fed states.
• Analyzing the cyclic occurrence of gastrointestinal migrating motor complexes (MMC) and associated hormonal changes.

Main Results:

• Systemic infusion of insulin, gastrin, neurotensin, and CCK8 replicated or prolonged the typical postprandial
• fed
• motor pattern.
• The fasted state is characterized by cyclic gastrointestinal migrating motor complexes (MMC), associated with fluctuating plasma levels of motilin, somatostatin, pancreatic polypeptide, and gastrin.
• Evidence suggests motilin initiates MMC, leading to somatostatin release, potentially driving MMC migration and cycling.

Conclusions:

• Specific digestive hormones, including insulin, gastrin, neurotensin, and CCK8, are implicated in initiating and sustaining the postprandial GI motor pattern.
• Motilin is hypothesized to initiate MMC, with somatostatin, pancreatic polypeptide, and gastrin potentially mediating its aboral migration and rhythmic cycling during the fasted state.
• These findings highlight the complex interplay between digestive hormones and GI motility regulation in humans.