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- W2305087117 abstract "The expression of thyroglobulin and other thyroid-specific markers depends upon the activation of protein kinase A (PKA) by cyclic AMP. A rat thyroid cell line dedifferentiates when transformed with Ki-ras oncogene. The decrease in thyroglobulin gene expression parallels a reduction in the level of PKA nuclear catalytic subunit. We find that the activity of cAMP-responsive elements and thyroglobulin promoters is down-regulated in Ras-transformed cells. Transcription of a third cAMP-regulated gene, H-ferritin, is similarly reduced. cAMP-responsive element and H-ferritin expression were stimulated when intracellular cAMP levels were increased. Reactivation of the thyroglobulin promoter required depletion of PKC in addition to increased cAMP. We also find that v-Ras activation leads to a significant increase in membrane-bound PKC. These data support the idea that v-Ras via PKC inhibits the transmission of cAMP-PKA signals to the nucleus. We suggest that the thyroglobulin promoter is more sensitive than other cAMP-dependent promoters to reduced nuclear levels of PKA catalytic subunit." @default.
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- W2305087117 date "1995-01-01" @default.
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- W2305087117 title "Ki-ras oncogene interferes with the expression of cyclic AMP-dependent promoters." @default.
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