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- W1964894281 abstract "Several growth factors may stimulate proliferation of thyroid cells. This effect has, in part, been dependent on calcium entry. In the present study using FRTL-5 cells, we show that in addition to its effect on calcium fluxes, ATP acts as a comitogen in these cells. In medium containing 5% serum, but no TSH, ATP stimulated the incorporation of 3H-thymidine in a dose- and time-dependent manner in the cells. At least a 24-h incubation with ATP was necessary to observe the enhanced (30–50%) incorporation of 3H-thymidine and an increased (30%) cell number. The effect of ATP was dependent on insulin in the incubation medium. Furthermore, ATP enhanced the TSH-mediated incorporation of 3H-thymidine. The effect of ATP was apparently mediated via a G-protein dependent mechanism, as no stimulation of thymidine incorporation was observed in cells treated with pertussis toxin. The effect of ATP was not dependent on the activation of protein kinase C (PKC), as ATP was effective in cells with downregulated PKC. ATP rapidly phosphorylated mitogen activated protein (MAP) kinase in FRTL-5 cells. In addition, ATP stimulated the expression of a 62 kDa c-fos dependent protein in a dose- and time-dependent manner. Our results thus suggest that extracellular ATP, in the presence of insulin, may be a cofactor in the regulation of thyroid cell proliferation, probably by phosphorylating MAP kinase and stimulating the expression of c-fos. © 1996 Wiley-Liss, Inc." @default.
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- W1964894281 date "1996-02-01" @default.
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- W1964894281 title "Purinergic agonist ATP is a comitogen in thyroid FRTL-5 cells" @default.
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- W1964894281 doi "https://doi.org/10.1002/(sici)1097-4652(199602)166:2<241::aid-jcp1>3.0.co;2-p" @default.
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