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• W279354311 abstract "Defolliculated Xenopus laevis oocytes were injected with size-fractionated poly(A)+ RNA (RNA) isolated from the jejunal epithelium of growing pigs (average BW 33.8 kg) to identify proteins capable of Na+ -independent amino acid transport. The ability of oocytes to absorb L-lysine (lysine) or L-leucine (leucine) from Na+- free media was quantified in oocytes after injection of RNA fractions or water. Specific RNA fractions were identified that induced saturable uptake of lysine (Kt = 52 microM) and leucine (Kt = 97 microM), whereas endogenous oocyte uptake was not saturable. Induced uptake of .05 mM lysine by oocytes was inhibited (P < .05) 68.1% by 5 mM leucine and 38.9% by .2 mM L-cystine (cystine). Induced uptake of .05 mM leucine was inhibited (P < .05) 83.1% by 5 mM lysine and 23.2% by .2 mM cystine. Although not significant (P > .05), 5 mM L-glutamate (glutamate) quantitatively stimulated the induced uptake of .05 mM lysine by 18.8% and the induced uptake of .05 mM leucine by 60%. To identify mRNA species responsible for this bo,+ transporter-like activity, oocytes were co-injected with the RNA fractions and degenerate DNA oligomers complementary (antisense) to the cloned human kidney bo,+ amino acid transporter, or (as a negative control) with a DNA oligomer complementary to the rabbit intestinal Na+/glucose cotransporter, or with water. Only those oocytes injected with two specific RNA fractions and the antisense DNA oligomer complementary to the bo,+ transporter displayed reduced (P < .05) uptake of lysine (45.7, 55.4%) and leucine (44.1, 65.9%). These results indicate that messenger RNA encoding for a protein capable of stimulating the competitive absorption of lysine and leucine is expressed by the jejunal epithelia of growing pigs." @default.
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• W279354311 date "1996-01-01" @default.
• W279354311 modified "2023-10-16" @default.
• W279354311 title "Demonstration and characterization of a transport system capable of lysine and leucine absorption that is encoded for in porcine jejunal epithelium by expression of mRNA in Xenopus laevis oocytes." @default.
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• W279354311 doi "https://doi.org/10.2527/1996.741127x" @default.
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