Folate is absorbed across the colon of adults: evidence from cecal infusion of 13C-labeled [6S]-5-formyltetrahydrofolic acid

被引:48
作者
Aufreiter, Susanne [1 ,4 ]
Gregory, Jesse F., III [6 ]
Pfeiffer, Christine M. [7 ]
Fazili, Zia [7 ]
Kim, Young-In [1 ,2 ,5 ]
Marcon, Norman [2 ,5 ]
Kamalaporn, Patarapong [5 ]
Pencharz, Paul B. [3 ,4 ]
O'Connor, Deborah L. [1 ,4 ]
机构
[1] Univ Toronto, Dept Nutr Sci, Toronto, ON M5G 1X8, Canada
[2] Univ Toronto, Dept Med, Toronto, ON M5G 1X8, Canada
[3] Univ Toronto, Dept Paediat, Toronto, ON M5G 1X8, Canada
[4] Hosp Sick Children, Res Inst, Toronto, ON M5G 1X8, Canada
[5] St Michaels Hosp, Div Gastroenterol, Toronto, ON M5B 1W8, Canada
[6] Univ Florida, Dept Food Sci & Human Nutr, Gainesville, FL 32611 USA
[7] Ctr Dis Control & Prevent, Atlanta, GA USA
关键词
BACTERIALLY SYNTHESIZED FOLATE; NEURAL-TUBE DEFECTS; FOLIC-ACID; COLORECTAL-CANCER; NEONATAL PIGLETS; LARGE-INTESTINE; POSTMENOPAUSAL WOMEN; MICROBIOLOGIC ASSAY; PROXIMAL COLON; SERUM FOLATE;
D O I
10.3945/ajcn.2008.27345
中图分类号
R15 [营养卫生、食品卫生]; TS201 [基础科学];
学科分类号
100403 [营养与食品卫生学];
摘要
Background: Folate deficiency increases the risk of several human diseases. Likewise, high intakes of folate, particularly synthetic folic acid intake, may be associated with adverse health outcomes in humans. A more comprehensive understanding of the "input side" of folate nutrition may help to set dietary recommendations that strike the right balance between health benefits and risks. It is well known that the microflora in the colon produce large quantities of folate that approach or exceed recommended dietary intakes; however, there is no direct evidence of the bioavailability of this pool in humans. Objective: The objective was to determine whether, and to what extent, the natural folate vitamer 5-formyltetrahydrofolic acid is absorbed across the intact colon of humans. Design: During screening colonoscopy, 684 nmol (320 mu g) [C-13]glutamyl-5-formyltetrahydrofolic acid was infused directly into the cecum of 6 healthy adults. Three or more weeks later, each subject received an intravenous injection of the same compound (172 nmol). Blood samples were collected before and after each treatment. The ratio of labeled to unlabeled folates was determined in plasma by tandem mass spectrometry. Results: The apparent rate of folate absorption across the colon of a bolus dose of [C-13]5-formyltetrahydrofolic acid infused into the cecum was 0.6 +/- 0.2 nmol/h, as determined by the appearance of [C-13(5)]5-methyltetrahydrofolic acid in plasma. In comparison, the rate of appearance of [C-13(5)]5-methyltetrahydrofolic acid after an intravenous injection of [C-13(5)]5-formyltetrahydrofolate was 7 +/- 1.2 nmol/h. Conclusion: Physiologic doses of natural folate are absorbed across the intact colon in humans. Am J Clin Nutr 2009;90:116-23.
引用
收藏
页码:116 / 123
页数:8
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