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Lymphatic Absorption of Microbial Plasmalogens in Rats
Nana Sato1, Aki Kanehama1, Akiko Kashiwagi2
1Faculty of Agriculture, Department of Biological Chemistry and Food Science, Iwate University, Morioka, Japan.
This study demonstrates that bacterial plasmalogens, even with unusual structures, can be absorbed into the lymph. These findings offer new insights into how plasmalogen chemical structures influence their biological functions in humans.
Area of Science:
- Biochemistry
- Lipid Metabolism
- Microbiology
Background:
- Plasmalogens are vital glycerophospholipids in humans, linked to various diseases.
- Understanding the diverse functions of plasmalogens based on their fatty acid composition is crucial but underexplored.
Purpose of the Study:
- To investigate the characteristics and absorption of bacterial plasmalogens from *Selenomonas ruminantium* in rats.
- To explore the relationship between plasmalogen chemical structure and biological function.
Main Methods:
- Optimized anaerobic fermentation of *S. ruminantium* for high-yield plasmalogen production.
- Characterized the composition of bacterial ethanolamine plasmalogen (PlsEtn) species.
- Administered bacterial plasmalogens via duodenal infusion to lymph duct-cannulated rats and analyzed lymphatic lipid composition.
Main Results:
- Bacterial plasmalogens, primarily PlsEtn with p16:1/14:0 and p16:1/16:1 at sn-1/sn-2 positions, were successfully produced.
- Bacterial PlsEtns were absorbed into rat lymph, with specific species showing distinct absorption patterns.
- Evidence suggests preferential re-esterification of endogenous fatty acids (20:4, 22:6) at the sn-2 position of absorbed plasmalogens.
Conclusions:
- Bacterial plasmalogens with unique structures can be absorbed and processed in mammals.
- This study provides a foundation for understanding how plasmalogen structure dictates biological roles.
- Findings contribute to the knowledge of lipid metabolism and the potential therapeutic applications of plasmalogens.
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