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• W2181723302 abstract "Metabolism of apolipoprotein (apo)A-I was studied in normal and chow-fed hyperthyroid rats, in 24-h fasted untreated male rats, and in rats after thyroparathyroidectomy (TXPTX). Rats were made hyperthyroid by administration of T3 (9.6 micrograms/day) or T4 (30 micrograms/day) with an Alzet osmotic minipump. Hyperthyroidism produced a similar two- to threefold elevation in plasma levels of apoA-I in male or female animals. During treatment with T3, plasma levels of T3 ranged from 200 to 400 ng/dl and did not correlate with plasma apoA-I levels. The net mass secretion and synthesis ([3H]leucine incorporation) of apoA-I by perfused livers from male hyperthyroid rats was elevated, while secretion of albumin was not different than that of euthyroid rats. Furthermore, the incorporation of [3H]leucine into total perfusate and hepatic protein was not altered by hyperthyroidism. The effect of thyroid hormone on apoA-I synthesis, therefore, does not appear to be a general effect on protein synthesis. After longer periods of treatment (28 days) with T3 (9.6 micrograms/day), hepatic apoA-I production decreased from that observed after 7 or 14 days of treatment, yet plasma apoA-I concentrations remained elevated. Plasma T3 decreased from 100 ng/dl to 40 ng/dl, in the hypothyroid rat resulting from TXPTX, but the plasma concentration of apoA-I did not change during the 2-week experimental period. The net secretion of apoA-I by livers from hypothyroid animals was depressed and albumin was uneffected compared to the euthyroid. Overnight fasting of euthyroid rats did not alter hepatic apoA-I secretion or plasma apoA-I levels, although under fasting conditions we had reported that hepatic output of apoB and E of VLDL is depressed. The addition of oleic acid to the perfusion medium, sufficient to stimulate VLDL production, did not affect net hepatic secretion of apoA-I by livers from euthyroid, hyperthyroid, or hypothyroid rats. In summary, hepatic synthesis of apoA-I appears to be controlled independently of other apo-lipoproteins and secretory proteins (albumin). Hepatic apoA-I synthesis is sensitive to thyroid status, increased in the hyperthyroid and decreased in the hypothyroid state. The specific stimulation of hepatic synthesis and secretion of apoA-I in the hyperthyroid state, however, tends to normalize over an extended period, perhaps from compensatory effects of a hormonal nature." @default.
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• W2181723302 date "1991-03-01" @default.
• W2181723302 modified "2023-09-28" @default.
• W2181723302 title "Effects of thyroid status and fasting on hepatic metabolism of apolipoprotein A-I" @default.
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• W2181723302 doi "https://doi.org/10.1016/s0022-2275(20)42062-0" @default.
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