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- W1991322015 abstract "Using a functioning rat thyroid cell line (FRTL-5), we studied the effects of tumor necrosis factor-alpha (TNF-alpha), interleukin-1 beta (IL-1 beta), and interleukin-6 (IL-6) on thyroidal type I iodothyronine 5'-deiodination (I-5'-deiodination) and on the expression of I-5'-deiodinase (I-5'-D) mRNA. After 24 h incubation in medium containing 0.5 microM rT3 with a tracer amount of [125I]rT3, radioactivity of released 125I- was counted. Deiodination in live FRTL-5 cells was enhanced about three times from the basal level by the addition of TSH and was inhibited markedly by propylthiouracil and dose dependently by T4. These results suggest the suitability of this model for investigating I-5'-deiodination in live thyroid tissue. Basal and TSH-induced I-5'-deiodination were significantly inhibited by 100 ng/liter of IL-1 beta and IL-6, and the inhibitory effect of TNF-alpha was seen over 1 microgram/liter. I-5'-deiodination was restored by removal of the cytokines. TSH-induced cAMP production and (Bu)2cAMP-induced I-5'-deiodination were also inhibited by the cytokines. Catalase, dexamethasone, and indomethacin did not abolish the inhibitory effects of the cytokines. Reverse transcriptase-polymerase chain reaction (RT-PCR) revealed a marked suppression of I-5'-D mRNA expression by IL-1 beta and IL-6. We conclude that these cytokines inhibit the thyroidal type I I-5'-deiodination in the order of potency IL-1 beta > IL-6 >> TNF-alpha, probably by decreasing the I-5'-D mRNA level.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1991322015 date "1995-04-01" @default.
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- W1991322015 title "Effects of Tumor Necrosis Factor-α, Interleukin-1β, and Interleukin-6 on Type I Iodothyronine 5′-Deiodination in Rat Thyroid Cell Line, FRTL-5" @default.
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- W1991322015 doi "https://doi.org/10.1089/jir.1995.15.367" @default.
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