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- W2023594842 abstract "ABSTRACT We have elucidated the action of tri-iodothyronine (T 3 ) on the synthesis and secretion of seven major plasma proteins in a human hepatoblastoma cell line, Hep G2, and established an in vitro experimental model of human liver cells for the study of the mechanism of the action of thyroid hormone. Hep G2 cells cultured in serum-free medium were treated with various concentrations of T 3 . During the first 24 h of T 3 treatment, accumulation of α-fetoprotein in the medium was decreased in a dose-dependent manner (10 −11 -10 −8 m ), and the inhibitory effect was enhanced during the second 24 h of T 3 treatment. On the other hand, α 1 -antitrypsin accumulation in the medium during the second 24 h of hormone treatment was decreased by T 3 (10 −9 –10 −8 m ), although no change in accumulation was observed during the first 24 h of T 3 treatment. The newly synthesized [ 35 S]Met-labelled α 1 -acid glycoprotein was increased by T 3 and reached 3·4-fold within 37 h of 10 −8 m T 3 treatment. The stimulatory effect increased time-dependently (4·6fold after 61 h). In contrast, the synthesis of α-fetoprotein was reduced to half of that of the control after T 3 treatment for 37 h. Although the content of newly synthesized [ 35 S]α 1 -antitrypsin was not affected by 10 −8 m T 3 treatment during 3 days of hormone treatment, the accumulation of α 1 -antitrypsin in the medium decreased to 87%; in contrast, total cellular newly synthesized α 1 -antitrypsin increased to 105–130% of that of the control. From these results, it is suggested that α 1 -antitrypsin secretion might be suppressed by T 3 treatment. However, T 3 did not affect the accumulation of albumin, transferrin, fibronectin and α 2 -macroglobulin in the medium throughout the experiments. It was shown that T 3 has diverse control mechanisms on the synthesis and secretion of plasma proteins in Hep G2 cells: stimulation (α 1 -acid glycoprotein) or inhibition (α-fetoprotein) of plasma protein synthesis, and inhibition of protein secretion (α 1 -antitrypsin)." @default.
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- W2023594842 title "Actions of 3,5,3′-tri-iodothyronine on the synthesis and secretion of major plasma proteins by a human hepatoblastoma cell line (Hep G2)" @default.
- W2023594842 doi "https://doi.org/10.1677/jme.0.0140227" @default.
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