The enzymatic deiodination of thyroxine (T4) is thiol dependent. Fasting (72 h) depresses hepatic T4 deiodination and lowers the hepatic content of nonprotein sulfhydryls (NP-SH) and reduced glutathione (GSH). It has been proposed that the fasting effect may be mediated through these alterations in hepatic sulfhydryls. To test the importance of tissue (hepatic) thiol content in the modification of T4 deiodination consequent to dietary manipulation, we examined the sequential deiodination of T4 to 3,5,3′-triiodothyronine (T3) (5′-deiodination) and 3,3′,5-triiodothyronine (reverse T3, rT3) (5-deiodination) in liver homogenates without added thiol from groups of rats fed Purina lab chow (P) (a protein-rich diet), glucose alone (G), or glucose plus cysteine (Gc) for 72 h or fasted (F) for the same period. The initial rate of each reaction was compared to the tissue concentrations of NP-SH and GSH.
Laurence A. Gavin, Francis A. McMahon, M. Moeller
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Contemporary Endocrinology
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1985 | |
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A Goswami, IN Rosenberg |
The Journal of biological chemistry | 1985 |
Ethanol feeding and thyroid hormone monodeiodination
ML Shank, SP Singh, BB Blivaiss, MA Kabir, K Williams, BN Premachandra |
Metabolism | 1984 |
Somatostatin inhibits rat hepatic T4-5'-deiodinase. The effect is independent of the associated hypoinsulinemia
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Journal of Clinical Investigation | 1983 |
The mechanism of recovery of hepatic T4-5′-deiodinase during glucose-refeeding: Role of glucagon and insulin
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Metabolism | 1983 |
Differing thyrotropin responses to increased serum triiodothyronine concentrations produced by overfeeding and by triiodothyronine administration
RD Utiger |
Metabolism | 1982 |
Alterations in hepatic monodeiodination of iodothyronines in the diabetic rat
IJ Chopra, W Wiersinga, H Frank |
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Effects of dietary manipulation on the generation of 3,5,3'-triiodothyronine from thyroxine in rat liver preparations
A Balsam, F Sexton, SH Ingbar |
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Life Sciences | 1981 |