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- W2199849754 abstract "Despite significant progress in the elucidation of the ontogeny of gastrointestinal function, little attention has been given to colonic lipid processing during development. The major purpose of this study was to explore the intracellular phase of fat absorption, lipid synthesis, and secretion in the human fetal colon compared with the jejunum originating from the same fetuses. The synthesis of lipids and major apolipoproteins was examined using cultured fetal colonic explants incubated with [14C]oleic acid and [36S]methionine, respectively. Fetal colonic explants demonstrated substantial ability to incorporate [14C]oleic acid (dpm/mg protein) into phospholipids (48,743 +/- 4,783), triglycerides (25,687 +/- 2,469), and cholesteryl esters (6,751 +/- 1,227). The total amount of radiolabeled lipids was much higher within the tissue (87,472 +/- 9,142) than in the medium (51,916 +/- 4,970), indicating a limited capacity of the fetal colon to export newly synthesized lipids. The limited colonic lipid secretory process was even more evident when compared with homologous fetal jejunal de novo synthesized lipids in tissue (133,975 +/- 13,836) and medium (279,858 +/- 1,610), respectively. Similar to the jejunum, the colon was able to elaborate all the phospholipid classes, with phosphatidylcholine accounting for > 70% of tissue phospholipids. However, their individual levels were present in lesser amounts in the colon (P > 0.001). Colonic explants elaborated most of the major lipoprotein classes but were less efficient than jejunal explants in exporting chylomicrons (33-fold), very low density lipoprotein (1.5-fold), and high-density lipoprotein (9-fold) into the medium. Apolipoprotein (apo) B synthesis and apo B mRNA editing were comparable in colonic and jejunal explants; thus they are not responsible for the defective lipoprotein secretion in the fetal large bowel. These results establish for the first time te capability of the human fetal colon to form, but not to efficiently transport, lipids, lipoproteins, and apoproteins." @default.
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- W2199849754 date "1996-05-01" @default.
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- W2199849754 title "Lipid processing and lipoprotein synthesis by the developing human fetal colon" @default.
- W2199849754 doi "https://doi.org/10.1152/ajpgi.1996.270.5.g813" @default.
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