cAMP induction of prespore and prestalk gene expression in Dictyostelium is mediated by the cell-surface cAMP receptor
Autor: | Donald J. Armstrong, Ben H. Leichtling, Richard H. Gomer, Richard A. Firtel |
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Rok vydání: | 1986 |
Předmět: |
Regulation of gene expression
Multidisciplinary biology Growth-hormone-releasing hormone receptor Phosphodiesterase 3 Phosphodiesterase Cell Differentiation biology.organism_classification Molecular biology Receptors Cyclic AMP Dictyostelium discoideum Gene Expression Regulation Caffeine Cyclic AMP biology.protein Dictyostelium RNA Messenger PDE10A CREB1 Protein kinase A Research Article |
Zdroj: | Proceedings of the National Academy of Sciences. 83:8624-8628 |
ISSN: | 1091-6490 0027-8424 |
Popis: | Extracellular adenosine 3',5'-cyclic monophosphate (cAMP) is required for cell-type-specific gene expression in developing Dictyostelium discoideum. We have developed a microassay for the expression of these genes, using antibodies directed against their protein products. To characterize the transduction mechanism, we have used in this assay cAMP analogues that preferentially activate either the cell-surface cAMP receptor or the internal cAMP-dependent protein kinase. N6-(aminohexyl) cAMP activates the Dictyostelium cAMP-dependent protein kinase but does not bind to the cell-surface cAMP receptor and does not cause cell-type-specific gene expression. 2'-Deoxy-cAMP does not activate the cAMP-dependent protein kinase but binds to the receptor and causes cell-type-specific gene expression. Cyclic AMP-induced accumulation of prestalk mRNA in shaking cultures still occurs in the presence of caffeine, which blocks the receptor-coupled activation of adenyl cyclase. This suggests that the extracellular cAMP induction of cell-type-specific gene expression in developing Dictyostelium cells is mediated by the cell-surface cAMP receptor and that activating adenyl cyclase by this receptor is not essential. Using the N6-(aminohexyl) cAMP to competitively inhibit phosphodiesterase, we show that 30 nM cAMP is sufficient to induce prestalk or prespore gene expression. |
Databáze: | OpenAIRE |
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