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Intestinal folate absorption. I. 5-Methyltetrahydrofolic acid
The primary dietary folate, 5-methyltetrahydrofolic acid (5-MTHF), is absorbed in the rat small intestine via diffusion. This study found no evidence of carrier-mediated transport for 5-MTHF absorption.
Area of Science:
- Nutritional biochemistry
- Gastrointestinal physiology
Background:
- 5-methyltetrahydrofolic acid (5-MTHF) is the main circulating form of folate.
- Understanding its intestinal absorption is crucial for nutritional science.
Purpose of the Study:
- To investigate the mechanism of intestinal absorption for 5-MTHF in rats.
- To determine if 5-MTHF absorption involves carrier-mediated transport or passive diffusion.
Main Methods:
- Utilized radiolabeled 5-MTHF in isolated rat intestinal segments.
- Measured mucosal to serosal transfer and flux rates across different intestinal sections.
- Assessed transfer in the presence of metabolic inhibitors and other folate compounds.
Main Results:
- 5-MTHF transfer was consistent across duodenal, jejunal, and ileal segments.
- No concentration gradient accumulation was observed, indicating passive transport.
- Transfer rates increased linearly with initial mucosal concentrations, consistent with diffusion.
Conclusions:
- Rat intestinal absorption of 5-MTHF does not involve a carrier-mediated system.
- 5-MTHF transfer across the intestinal epithelium most likely occurs via passive diffusion.
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