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- W2015641307 abstract "Abstract Hyperthyroidism is associated with elevated plasma levels of endothelium-derived proteins such as von Willebrand factor (vWF), fibronectin (FN) and endothelin-1 (ET-1). This study was designed to characterize the mechanisms involved in this phenomenon at the cellular level. vWF, FN and ET-1 secretion and mRNA expression were measured in human umbilical vein endothelial cells (HUVECs) exposed to tri-iodothyronine (T 3 ) for 13 ± 1 days, using ELISA, Western blot, RIA and Northern blot analysis respectively. Exposure of HUVECs to T 3 significantly increased vWF secretion (50 ng T 3 /ml: 117 ± 5%, P <0·01; 100 ng T 3 /ml: 127 ± 26%, P <0·01) as well as vWF mRNA expression (50 ng/ml: 116 ± 13%, P <0·001; 100 ng/ml: 136 ± 30%, P <0·002) (results are means ± s.d. analysed by the Wilcoxon signed rank test). FN secretion was significantly affected by 50 (145 ± 42% of control, P <0·05) and 100 (116·8 ± 16% of control, P <0·05) ng T 3 /ml, and FN mRNA expression by 50 ng T 3 /ml (123 ± 20%, P <0·05). Long-term incubation with T 3 increased both ET-1 secretion (25 ng/ml: 124 ± 25%, P <0·001; 50 ng/ml: 165 ± 53%, P <0·05; 100 ng/ml: 116 ± 17%, P <0·05) and prepro-ET-1 mRNA expression (25 ng/ml: 112 ± 16%, P <0·05; 50 ng/ml: 134 ± 43%, P <0·02; 100 ng/ml: 120 ± 20%, P <0·02). Protein kinase C (PKC) isoforms ε and βII were not significantly affected by T 3 , whereas PKC α was increased in whole cell lysates and in membrane fractions of cells incubated with 100 but not 50 ng T 3 /ml. Prepro-ET-1 mRNA stability, cell numbers and proliferation, measured by [ 3 H]thymidine assays, remained unaffected in HUVECs after exposure to T 3 . These data indicate thyroid hormone-induced upregulation of mRNA expression and protein synthesis of vWF, FN and ET-1, by PKC α-, βII- and ε-independent pathways, explaining, at least in part, increased plasma concentrations of endothelial proteins and peptides in the hyperthyroid state. Journal of Endocrinology (1997) 154, 231–239" @default.
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- W2015641307 date "1997-08-01" @default.
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- W2015641307 title "Increase by tri-iodothyronine of endothelin-1, fibronectin and von Willebrand factor in cultured endothelial cells" @default.
- W2015641307 doi "https://doi.org/10.1677/joe.0.1540231" @default.
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