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- W1498523140 abstract "Free fatty acids (ffa) can enter the intestinal cell via the apical (AP) or basolateral (BL) membrane. The authors are using the Caco-2 intestinal cell line to examine the polarity of ffa uptake and metabolism in the enterocyte. Cells are grown on permeable polycarbonate Transwell filters in order to obtain access to both AP and BL compartments. Differentiated Caco-2 cells form tight polarized monolayers which express small intestine-specific enzymes and are impermeable to the fluid phase marker Lucifer Yellow. Submicellar concentrations of {sup 3}H-palmitic acid (2uM) were added to AP or BL sides of Caco-2 monolayers at 37{degrees}C and cells were incubated for various times between 2 and 120 minutes. Total AP and BL uptake is similar; however, when relative membrane surface areas are accounted for, AP uptake is about 2-fold higher. The metabolism of AP and BL ffa is not significantly different: triacylglycerol and phosphatidylcholine account for most of the metabolites (32{plus minus}4 and 24{plus minus}2% respectively at 5 minutes). Little ffa oxidation is observed. Preincubation with albumin-bound 2-monoolein (100uM) and palmitate (50uM) increases the level of TG metabolites. The results suggest that in this cell line the uptake of AP ffa may be greater than BL ffa, butmore » that AP (dietary) ffa and BL (plasma) ffa are metabolized similarly.« less" @default.
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- W1498523140 date "1990-02-26" @default.
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- W1498523140 title "Polarity of fatty acid uptake and metabolism in a human intestinal cell line (CACO-2)" @default.
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