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  • Title: The effect of thyrotropin receptor antibodies on the proliferation of FRTL-5 cells and the expression of protooncogene c-fos mRNA.
    Author: Fang P, Lü M, Zhou W, Li J, Xu B, Tang T, Tan Y.
    Journal: Chin Med J (Engl); 1998 May; 111(5):412-5. PubMed ID: 10374349.
    Abstract:
    OBJECTIVE: Hyperthyroidism and a diffuse goiter are the main symptoms of Graves' disease (GD) associated with autoantibodies to thyroid-stimulating hormone (TSH) receptor (TRAb). The present study was conducted to evaluate effects of autoantibodies in patients with GD (TRAb-IgG) on induction of the proliferation and c-fos mRNA expression in FRTL-5 cells (Fisher rat thyroid cell line). METHODS: Highly purified IgG fractions were isolated from 11 patients with GD, TRAb-IgG and 15 normal individuals (normal controls) with Protein A Sepharose CL-4B affinity column chromatograph. FRTL-5 cells, which had been grown to subconfluency and deprived of TSH for a few days. Then, these cells were used for measuring cAMP content, 3H-thymidine incorporation in cells and the expression of c-fos mRNA respectively. RESULTS: After stimulation of TRAb-IgG, the cAMP production and 3H-thymidine incorporation in FRTL-5 cells were much higher than those from normal controls (P < 0.05 respectively). Using 32P labelled v-fos probe by the Northern Blot method, the expression of c-fos mRNA could be induced by IgGs from patients with GD. CONCLUSIONS: These data suggest that the stimulation of TRAb-IgG followed by cAMP production and 3H-thymidine incorporation is related to the induction of c-fos mRNA and, thus, to the growth of FRTL-5 cells.
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