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- W2997657478 abstract "Thyroid-associated ophthalmopathy (TAO), an autoimmune disease, occurs in approximately 50 % of patients with Graves’ hyperthyroidism. Thyroid-stimulating hormone receptor (TSHR) that is expressed in orbital fibroblasts is the autoimmune target in the development of TAO. In addition to thyroid-stimulating immunoglobulin (TSI), insulin-like growth factor (IGF)-1 is also involved in the development of TAO. IGF-1 has been reported to potentiate the effects of thyroid-stimulating hormone (TSH) and TSI on TSHR signaling. In the current study, we investigated the effects of IGF-1 on the cell surface expression of the functional TSHR and its possible mechanism of action in human orbital fibroblasts. Our results show that orbital fibroblasts from the TAO patients expressed higher levels of IGF-1 receptor (IGF-R), compared to control subjects. Treatment with IGF-1 enhanced the expression of surface TSHR in orbital fibroblasts from TAO patients, but not from control subjects. In addition, treatment with IGF-1 increased the level of TSHR at both the protein and mRNA levels. Furthermore, pre-treatment with IGF-1 potentiated TSH-induced cAMP production, compared to cells that were treated with only TSH. Our results also show that pre-treatment with cycloheximide, an inhibitor of mRNA translation, partially, but not completely, inhibited the expression of TSHR on the cell surfaces of orbital fibroblasts from TAO patients. These collective results show that IGF-1enhances the cell surface expression of functional TSHR, not only by increasing TSHR expression, but also by inducing TSHR translocation to the plasma membrane in orbital fibroblasts from TAO." @default.
- W2997657478 created "2020-01-10" @default.
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- W2997657478 date "2020-03-01" @default.
- W2997657478 modified "2023-10-17" @default.
- W2997657478 title "Insulin-like growth factor-1 enhances the expression of functional TSH receptor in orbital fibroblasts from thyroid-associated ophthalmopathy" @default.
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- W2997657478 doi "https://doi.org/10.1016/j.imbio.2019.151902" @default.
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