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• W1991034730 abstract "Livers from fed male Sprague-Dawley rats, made hyperthyroid by treatment with triiodothyronine (T3), were isolated and perfused in vitro. T3 (9.6 μg/day) was administered by osmotic minipump implanted intraperitoneally. Treatment with T3 for either 7 or 28 days reduced hepatic output of very-low-density lipoprotein (VLDL) and net synthesis of total associated apoproteins. After 7 days treatment, incorporation of [4,5-3H]leucine by livers from hyperthyroid rats into VLDL apo E was reduced while incorporation into apo B100, apo B48, and apo C's did not differ from euthyroid controls. The depressed incorporation of radioactivity into total VLDL protein was accounted for almost entirely on the basis of apo E. Incorporation of leucine into the total lipoprotein apo E isolated in the d < 1.210 was also diminished by the hyperthyroid state, while that into apo B100, apo B48, and apo C in the total perfusate lipoprotein was similar to that of the euthyroid, as was found for the VLDL. Increased amounts of radioactive apo B100 and apo B48, however, were detected in the HDL fraction isolated from the medium perfusing livers from hyperthyroid rats. Hepatic uptake of VLDL protein and lipid was similar in euthyroid and hyperthyroid rats. Reduction of VLDL lipid and protein in the medium perfusing livers from T3-treated rats, therefore reflects hormonal action on synthesis and secretion, rather than uptake. Since the availability of apo B is thought to be required for secretion of VLDL, our observation suggests that synthesis of apo B is not depressed by treatment with T3 and that apoprotein synthesis is not a significant factor in the decreased output of VLDL by the liver, but that, as reported earlier, the lower output is a consequence of decreased synthesis of TG, the result of a diminished supply of hepatic glycero-3-phosphate in the hyperthyroid. The diminished amount of VLDL protein appears to be accounted for by the decreased quantity of apo E associated with a smaller VLDL particle secreted by livers from T3-treated rats." @default.
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• W1991034730 date "1991-02-01" @default.
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• W1991034730 title "Effects of hyperthyroidism on synthesis, secretion and metabolism of the VLDL apoproteins by the perfused rat liver" @default.
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• W1991034730 doi "https://doi.org/10.1016/0005-2760(91)90278-p" @default.
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