Abstract
Background: Medium-chain triglycerides are used for the treatment of malabsorptive states. We measured directly the absorption of medium- and long-chain fatty acids via the mesenteric lymphatics and portal vein in normal animals. These results may be useful in guiding therapy for short- bowel syndrome. Methods: Under anesthesia, male Lewis rats (n = 6) underwent placement of jugular and portal venous lines, mesenteric lymphatic duct cannula, and a duodenal tube. After recovery, a 0.3% lauric acid (C12:0) and 0.37% palmitic acid (C16:0) solution solublized with 3.25 mmol/L lecithin and 23.75 mmol/L taurocholic acid in phosphate-buffered saline was infused at a rate of 3 mL/h via the duodenal tube. After stabilization of lymphatic flow (6 hours), a pulse of radiolabeled lauric and palmitic acid was given via the duodenal tube; absorption was measured by collection of lymphatic fluid and sampling of the portal and jugular venous blood for 4 hours. Results: The amount of acid recovered in the lymphatics was 51% ± 6% (mean ± SD) for lauric and 59% ± 6% for palmitic. For both fatty acids, <1% in total was recovered from the portal vein during the 4-hour postbolus period; thereafter, levels in the blood were constant and very low. At necropsy, the majority of the remaining label was found in the intestine. Conclusions: These results show no evidence for the preferential absorption of medium- chain fatty acids directly via the portal vein in this model. We suggest that further studies be done to measure directly portal vein absorption of the medium-chain fatty acids.
| Original language | English |
|---|---|
| Pages (from-to) | 275-278 |
| Number of pages | 4 |
| Journal | Journal of Parenteral and Enteral Nutrition |
| Volume | 21 |
| Issue number | 5 |
| State | Published - Sep 1 1997 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Medicine (miscellaneous)
- Food Science
Cite this
Determination of the route of medium-chain and long-chain fatty acid absorption by direct measurement in the rat. / Sigalet, David L.; Winkelaar, Gerrit B.; Smith, Lesley J.
In: Journal of Parenteral and Enteral Nutrition, Vol. 21, No. 5, 01.09.1997, p. 275-278.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Determination of the route of medium-chain and long-chain fatty acid absorption by direct measurement in the rat
AU - Sigalet, David L.
AU - Winkelaar, Gerrit B.
AU - Smith, Lesley J
PY - 1997/9/1
Y1 - 1997/9/1
N2 - Background: Medium-chain triglycerides are used for the treatment of malabsorptive states. We measured directly the absorption of medium- and long-chain fatty acids via the mesenteric lymphatics and portal vein in normal animals. These results may be useful in guiding therapy for short- bowel syndrome. Methods: Under anesthesia, male Lewis rats (n = 6) underwent placement of jugular and portal venous lines, mesenteric lymphatic duct cannula, and a duodenal tube. After recovery, a 0.3% lauric acid (C12:0) and 0.37% palmitic acid (C16:0) solution solublized with 3.25 mmol/L lecithin and 23.75 mmol/L taurocholic acid in phosphate-buffered saline was infused at a rate of 3 mL/h via the duodenal tube. After stabilization of lymphatic flow (6 hours), a pulse of radiolabeled lauric and palmitic acid was given via the duodenal tube; absorption was measured by collection of lymphatic fluid and sampling of the portal and jugular venous blood for 4 hours. Results: The amount of acid recovered in the lymphatics was 51% ± 6% (mean ± SD) for lauric and 59% ± 6% for palmitic. For both fatty acids, <1% in total was recovered from the portal vein during the 4-hour postbolus period; thereafter, levels in the blood were constant and very low. At necropsy, the majority of the remaining label was found in the intestine. Conclusions: These results show no evidence for the preferential absorption of medium- chain fatty acids directly via the portal vein in this model. We suggest that further studies be done to measure directly portal vein absorption of the medium-chain fatty acids.
AB - Background: Medium-chain triglycerides are used for the treatment of malabsorptive states. We measured directly the absorption of medium- and long-chain fatty acids via the mesenteric lymphatics and portal vein in normal animals. These results may be useful in guiding therapy for short- bowel syndrome. Methods: Under anesthesia, male Lewis rats (n = 6) underwent placement of jugular and portal venous lines, mesenteric lymphatic duct cannula, and a duodenal tube. After recovery, a 0.3% lauric acid (C12:0) and 0.37% palmitic acid (C16:0) solution solublized with 3.25 mmol/L lecithin and 23.75 mmol/L taurocholic acid in phosphate-buffered saline was infused at a rate of 3 mL/h via the duodenal tube. After stabilization of lymphatic flow (6 hours), a pulse of radiolabeled lauric and palmitic acid was given via the duodenal tube; absorption was measured by collection of lymphatic fluid and sampling of the portal and jugular venous blood for 4 hours. Results: The amount of acid recovered in the lymphatics was 51% ± 6% (mean ± SD) for lauric and 59% ± 6% for palmitic. For both fatty acids, <1% in total was recovered from the portal vein during the 4-hour postbolus period; thereafter, levels in the blood were constant and very low. At necropsy, the majority of the remaining label was found in the intestine. Conclusions: These results show no evidence for the preferential absorption of medium- chain fatty acids directly via the portal vein in this model. We suggest that further studies be done to measure directly portal vein absorption of the medium-chain fatty acids.
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M3 - Article
VL - 21
SP - 275
EP - 278
JO - Journal of Parenteral and Enteral Nutrition
JF - Journal of Parenteral and Enteral Nutrition
SN - 0148-6071
IS - 5
ER -