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Intestinal expression of apolipoprotein A-IV and C-III is coordinately regulated by dietary lipid in newborn swine.

The purpose of this study was to determine the effects of dietary fatty acids on intestinal apolipoprotein (apo) A-IV and C-III expression in the newborn piglet. Two-day-old female piglets received one of three isocaloric formulas containing medium-chain triglycerides (TG) (MCT), intermediate-chain saturated TG (ICST), or long-chain polyunsaturated TG (LCPUT) by continuous duodenal infusion for 24 hrs. Control groups received a low-TG elemental formula infusion (LTG group) and a high-TG long-chain unsaturated lipid emulsion infusion (HTG group). Jejunal synthesis of both apo A-IV and C-III was increased by all infusions compared to the LTG group. Apo A-IV and C-III mRNA levels paralleled synthesis levels except for apo C-III with the MCT diet, where regulation appeared to occur at the translational level. Among all groups, apo A-IV synthesis and mRNA abundance were linearly correlated with that of apo C-III.