Regulation of trascription factor by GABA_B mechanisms in cultured neuronal cells
| Project/Area Number | 08672537 |
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biological pharmacy
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| Research Institution | Nihon University |
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Principal Investigator |
ISHIGE Kumiko Nihon University Pharmacy inst Ins ructor, 薬学部, 助手 (40212873)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed(Fiscal Year 1997)
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| Budget Amount *help |
¥1,400,000 (Direct Cost : ¥1,400,000)
Fiscal Year 1997 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1996 : ¥700,000 (Direct Cost : ¥700,000)
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| Keywords | gamma-hydoxybutyric acid / cyclic AMP responsive element / activator protein 1 / GABA_B receptors / Ca^<2+> / neuronal cells / activator protein 1 DNA / a ctivator proteinl / 細胞内Ca^<2+> |
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| Research Abstract |
It this study, the effect of gamma-hydroxybutyric acid (GHB) in nuclear cyclic AMP responsive element (CRE) -and activator protein 1 (AP-1) DNA-binding activities in primary neuronal cultured cellswas examined. Gel-shift assays showed that exposure of the cells to GHB (1mM) increased nuclear CRE-and AP-1 DNA-binding activities in cultured mouse cerebellar granule cells and cerebral cortical cells. These increases in nuclear DNA-binding activities in cultured mouse cerebellar granule cells were antagonized by specific GABA_B antagonists such as CGP 55845 (1muM) and CGP 35348 (1mM). In addition, treatment of the cells with 1,2-bis (2'-aminophenoxy) ethane-N, N, N', N'-tetraacetic acid tetraacetoxymethyl ester (BAPTA-AM), an intracellular Ca^<2+> chelating agent, or thapsigargin, an endoplasmic reticulum Ca^<2+>-ATPase inhibitor, suppressed the GHB-induced increases in nuclear DNA-binding activities. Furthermore, the GHB-induced increases in nuclear CRE-and AP-1 DNA-binding activities were suppressed by treatment with calmodulin kinase II inhibitors such as KN-62 (10muM) and KN-93 (10muM). In addition, the CRE-binding activity was completely supershifted by the CRE-binding protein (CREB) antibody, and was eliminated by the phospholyrated CREB antibody. The AP-1 DNA-binding activity was blocked by c-Jun and c-Fos antibodies. These results siggest that stimulation of GABA_B receptors by GHB activates intracellular Ca2+ storage sites and that increased intracellular Ca^<2+> plays an important role in elevation of nuclear CRE-and AP-1 DNA-binding activities and that calmodulin kinase II plays an important role in DHB-induced increases in both DNA-binding activities in cultured cerebellar granule cells. It is also suggested that GHB promotes the phosphorylation of CREB.
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Report
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Research Products
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