Journal of Korean Endocrine Society 1994;10(3):242-248.
Published online November 6, 2019.
The Effect of Tumor Necrosis Factor - α on Extra Thyroidal Conversion of T4 to T3 in Slices and Extracts of Porcine Liver and Kidney.
Jae Wha Jo, Moon Suk Nam, Su Youn Nam, Young Duk Song, Sung Kil Lim, Hyun Chul Lee, Kap Bum Huh, Kyung Rae Kim, Eun Jig Lee
Abnormal thyroid function is seen in a wide variety of patients with acute and chronic nonthyroidal-illness, consisting of reduction in both thyroid function and peripheral T_4 to T_3 conversion including decreased serum thyroxin(T_4), decreased triiodothyronine and normal or slightly increased serum TSH. Recently increasing awareness of the role tumor necrosis factor-alpha(TNF-alpha) in systemic illness led us to consider a possible contribution of TNF-alpha to thyroid dysfunction in this setting. So we hypothesized that TNF-alpha might affect peripheral conversion of T_4 to T_3. We, therefore, explored the effects of TNF-alpha in slices and extracts of porcine liver and kidney. Thyroxine(T_4, 5ug/ml) was incubated in 0.15M phosphate buffer(PH 7.4) with slices(approximately 0.3 g-equivalent of tissue) and extracts(approximately 0.23 g-equivalent of tissue) of porcine liver and kidney with various concentrations(0-500pg/ml) of recombinant human TNF-alpha for 2 hours at 37 degree, and the T_3 generated during incubation was measured by radioimmunoassay of an ethanol extracts of the extracts and the homogenates of the slices. The slices produced more T_3 than extracts and the kidney was more active than the liver. TNF-alpha inhibited T_4 to T_3 conversion in dose-dependent manner in slices and extracts of porcine liver and kidney. Our data suggest that TNF-alpha have inhibitory effect of T_4 to T_3 conversion in liver and kidney(J Kor Soc Endocrinol 10: 242-248, 1995).
Key Words: TNF - α, T4 to T3 conversion

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