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• W2061181306 abstract "N6-O'2-dibutyryl cAMP (dbcAMP), N6-monobutyryl cAMP (N6-mbcAMP), 8-Chloro cAMP (ClcAMP), and O'2-monobutyryl cAMP (O'2-mbcAMP) were used to study glial fibrillary acidic protein (GFAP) induction in rat C6 glioma. With the exception of O'2-mbcAMP, these cAMP analogs induced GFAP after stimulation of cells with a concentration of 0.5-1 mM. Only dbcAMP and N6-mbcAMP increased the intracellular concentration of cAMP. Protein kinase A (PKA) activation is often proposed to be involved in GFAP expression in astrocytes. Ion-exchange chromatography indicated that protein kinase activity is associated with PKA type II in C6. dbcAMP, N6-mbcAMP, and ClcAMP upregulated the amount of cAMP-binding proteins approximately twofold. RI was upregulated in the cytosol and particulate fraction, whereas RII was not affected after stimulation with dbcAMP. Concomitant, the PKA activity decreased approximately 60% and 40% in the cytosol and particulate fraction, respectively. CREB is constitutively expressed in C6 and is downregulated after stimulation with dbcAMP. The membrane-permeable PKA inhibitor N-[2-(p-bromocinnamylamino)ethyl]-5-isoquinoline sulfonamide (H89) did not suppress the induction of GFAP-mRNA and its translation into GFAP. On the contrary, depending on the time difference between H89 and dbcAMP addition to C6, GFAP synthesis could even be potentiated more than twofold. Experiments in the presence of cycloheximide showed that protein synthesis is necessary for GFAP transcription. Although all components of the PKA signal transduction pathway are present in C6, GFAP synthesis is not dependent on PKA activation but required the synthesis of an unidentified factor." @default.
• W2061181306 created "2016-06-24" @default.
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• W2061181306 date "1997-05-15" @default.
• W2061181306 modified "2023-10-14" @default.
• W2061181306 title "Cyclic AMP-mediated induction of the glial fibrillary acidic protein is independent of protein kinase A activation in rat C6 glioma." @default.
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• W2061181306 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9169858" @default.
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