首页> 美国政府科技报告 >Chronic Membrane Depolarization Regulates the Level of the Guanine Nucleotide Binding Protein G sub o alpha in Cultured Neuronal Cells
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Chronic Membrane Depolarization Regulates the Level of the Guanine Nucleotide Binding Protein G sub o alpha in Cultured Neuronal Cells

机译:慢性膜去极化调节培养的神经细胞中鸟嘌呤核苷酸结合蛋白G sub o alpha的水平

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Chronic membrane depolarization results in an increase in muscarinic acetylcholine receptor (mAChR) number in N1E-115 neuroblastoma cells. Because the mAChR interacts with the guanine nucleotide binding regulatory (G) proteins, G sub i and G sub o, the effect of chronic membrane depolarization on the levels of subunits of these G proteins was examined. Quantitation of G protein subunit levels was performed using affinity-purified, monospecific antibodies in a quantitative immunoblot assay. Incubation with 50 micromole veratridine (VTN), an activator of voltage-sensitive Sodium(+) channels, induced a 48 + or - 15% increase in the level of the alpha subunit of G sub o. The effect of VTN was blocked by tetrodotoxin. On removal of VTN, the level of G sub o alpha decreased to control levels within 24 h. The levels of the alpha subunit of G sub i and the common beta subunit were not affected by VTN treatment. These results show that in N1E-115 cells, the level of the alpha subunit of G sub o is regulated in a chronic membrane depolarization. Reprints. (aw)

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