Postprandial increase of oleoylethanolamide mobilization in small intestine of the Burmese python (Python molurus)

Area of Science:

• Comparative Physiology
• Lipid Metabolism
• Gastrointestinal Endocrinology

Background:

• Oleoylethanolamide (OEA) is an endogenous lipid mediator known to inhibit feeding in rodents by activating the PPAR-alpha receptor.
• In rodents, intestinal OEA levels rise post-feeding, contributing to satiety.
• Burmese pythons exhibit extreme feeding patterns and significant post-meal physiological changes.

Purpose of the Study:

• To investigate if feeding-induced OEA mobilization occurs in Burmese pythons (Python molurus).
• To explore the potential evolutionary conservation of OEA's role in energy intake regulation.

Main Methods:

• Measurement of OEA levels in the gastrointestinal tract of fasted and fed pythons using liquid chromatography/mass spectrometry (LC/MS).
• Analysis of N-acyl phosphatidylethanolamine species as potential OEA precursors.
• Quantification of various fatty-acid ethanolamides (FAEs) in python intestines.

Main Results:

• A dramatic, nearly 300-fold increase in small intestinal OEA levels was observed in fed pythons compared to fasted ones.
• Increased levels of OEA precursors (N-acyl phosphatidylethanolamines) suggest in situ OEA biosynthesis.
• Elevated levels of saturated, mono-, and diunsaturated FAEs were found in fed pythons' small intestines.

Conclusions:

• Feeding stimulates significant OEA mobilization in the Burmese python's gastrointestinal tract.
• The presence of OEA and related FAEs in pythons indicates a potentially widespread role for these lipid messengers across vertebrate groups.
• OEA may represent an evolutionarily ancient mechanism for regulating energy intake.