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- W4256604910 abstract "The effects of thyroid status on glycolysis using 10, 20, and 40 mM glucose have been examined in hepatocytes derived from hypothyroid, euthyroid, and hyperthyroid rats. For any given concentration of added glucose, total glycolytic rates, as measured by the release of tritium from [6-3H]glucose, were similar in all thyroid states. The aerobic component of glycolysis, where cytoplasmically generated reducing equivalents are transferred to the mitochondria for oxidation, was the major component in the hyper-thyroid state, at all concentrations of glucose. In contrast, the aerobic proportion of glycolysis in the hypothyroid and euthyroid states decreased with increasing concentration of added glucose and the anaerobic component became dominant above 20 mM glucose. Cytoplasmic reducing equivalents generated during aerobic glycolysis were transferred to the mitochondria via both the glycerol 1-phosphate and malate/aspartate shuttles in each thyroid state, even though the former shuttle was considerably depressed in the livers of hypothyroid rats. Both asparagine and aminooxyacetate had only minor effects on the rate of glycolysis, but aminooxyacetate depressed the contribution of aerobic glycolysis whereas asparagine had relatively little influence. The respiration rate in the presence of 40 mM glucose was twice as high in hepatocytes from hyperthyroid rats as in cells from hypothyroid animals, and 1.4 times as high as in hepatocytes from euthyroid rats. Smaller stimulations were observed with lower concentrations of added glucose. Furthermore, the increase in respiratory rate over the endogenous value, induced by 10 mM glucose, was six times higher in cells from hyperthyroid rats than in hepatocytes from hypothyroid animals and 2.7 times higher than that observed with cells from euthyroid rats. The insensitivity of glycolysis to thyroid status in contrast to the marked response of respiration provides additional support for the view that the stimulation of metabolism by thyroid hormone is mediated primarily by its action on mitochondrial processes." @default.
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- W4256604910 date "1995-04-01" @default.
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- W4256604910 title "The Influence of Thyroid State on Hepatic Glycolysis" @default.
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- W4256604910 doi "https://doi.org/10.1111/j.1432-1033.1995.tb20474.x" @default.
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