Erythromycin induces migrating motor complex in human gastrointestinal tract

Area of Science:

• Gastroenterology
• Pharmacology
• Human Physiology

Background:

• The migrating motor complex (MMC) is a crucial pattern of contractions in the interdigestive gastrointestinal tract.
• Motilin is a hormone known to stimulate MMC.
• Erythromycin, a macrolide antibiotic, has shown prokinetic effects, but its specific role in initiating MMC is not fully understood.

Purpose of the Study:

• To investigate the effect of intravenous erythromycin administration on the initiation of the migrating motor complex (MMC) in healthy human subjects.
• To compare the characteristics of erythromycin-induced MMC-like contractions with naturally occurring MMCs.
• To explore the potential involvement of endogenous motilin in erythromycin's effect on MMC.

Main Methods:

• Fifteen healthy, fasted subjects underwent intravenous infusion of either erythromycin (1.0 or 3.0 mg/kg/hr) or normal saline.
• Manometric methods were used to record gastrointestinal motility.
• The timing of MMC initiation, duration, frequency, amplitude, and velocity were analyzed and compared between groups.

Main Results:

• Erythromycin significantly shortened the interval to the next MMC initiation compared to normal saline (23.0-47.8 min vs. 151.2 min).
• Erythromycin-induced contractions showed similar characteristics to natural MMCs, except for a longer phase III duration in the stomach.
• Erythromycin infusion did not significantly alter immunoreactive motilin concentrations.

Conclusions:

• Erythromycin, at doses of 1-3 mg/kg/hr, significantly influences the initiation of the migrating motor complex (MMC) in the human gastrointestinal tract during the interdigestive state.
• Erythromycin's effect on MMC initiation is comparable to that of motilin.
• Further research is needed to determine if endogenous motilin plays a role in mediating erythromycin's prokinetic effects on MMC.