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- W2013164265 abstract "Insulin enhances the ability of TSH to induce iodide uptake in FRTL-5 rat thyroid cells maintained in 5% serum; however, in cells maintained in 0.2% serum, insulin inhibits the ability of TSH to induce iodide uptake. Since the inhibitory action of insulin is duplicated by 100-fold lower concentrations of insulin-like growth factor-I (IGF-I), inhibition appears to be mediated by the IGF-I receptor. Insulin and IGF-I inhibit the action of a cAMP analog to induce iodide uptake in a manner identical to TSH, but do not inhibit basal or TSH-increased cAMP levels; inhibition, thus, results from regulation of cAMP signal action rather than cAMP signal generation. Inhibition is associated with a more than 2-fold decrease in the maximum velocity of iodide influx, a less than 15% change in the rate of iodide efflux, and no change in the Km for iodide influx, i.e. inhibition effectively results from a decrease in the number of iodide porters. The inhibitory action of insulin/IGF-I is not additive with hydrocortisone, which, under the same conditions, also inhibits TSH- or cAMP-induced iodide porter activity. Actinomycin-D, given 24 h after TSH, superinduces TSH-induced iodide porter activity and abolishes the inhibition by insulin, IGF-I, and/or hydrocortisone; a similar paradoxical effect of actinomycin-D under these conditions has been explained by its ability to inhibit the action of a cAMP-induced factor that increases mRNA degradation. The inhibitory actions of insulin, IGF-I, and hydrocortisone on cAMP-induced iodide porter activity contrast with their simultaneous and synergistic stimulation of the transcriptional action of cAMP on DNA and thyroglobulin synthesis under these conditions." @default.
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- W2013164265 date "1991-02-01" @default.
- W2013164265 modified "2023-09-24" @default.
- W2013164265 title "Insulin and Insulin-Like Growth Factor-I Inhibit Thyrotropin-Increased Iodide Transport in Serum-Depleted FRTL-5 Rat Thyroid Cells: Modulation of Adenosine 3′,5′-Monophosphate Signal Action" @default.
- W2013164265 doi "https://doi.org/10.1210/endo-128-2-1136" @default.
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