Upstream Mechanisms of Glycogen Synthase Activation by Insulin and Insulin-like Growth Factor-I

Upstream Mechanisms of Glycogen Synthase Activation by Insulin and Insulin-like Growth Factor-I
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胰岛素和胰岛素样生长因子-I 激活糖原合酶的上游机制

DOI:
10.1074/jbc.270.6.2729
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发表时间:
1995
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
T. Kadowaki
T. Kadowaki
中科院分区:
--
文献类型:
--
作者:
R. Yamamoto;K. Tobe;Y. Kaburagi;K. Ueki;Shojiro Asai;M. Yachi;M. Shirouzu;J. Yodoi;Y. Akanuma;S. Yokoyama;Y. Yazaki;T. Kadowaki

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本研究旨在定义糖原合酶激活上游的细胞内信号传导途径。首先,我们研究了胰岛素信号传导的两条途径(Ras 依赖性和渥曼青霉素/LY294002 敏感)在糖原合酶激活中的作用。尽管 PC12 细胞中负显性 Ras (Ras17N) 诱导显着降低了促细胞分裂原激活蛋白激酶 (MAP) 和 pp90 S6 激酶响应胰岛素或胰岛素样生长因子 I (IGF-I) 的活性,但这些药物对糖原合酶的激活不受负显性 Ras 诱导的影响。相比之下,渥曼青霉素和 2-(4-吗啉基)-8-苯基-4H-1-苯并吡喃-4-酮 (LY294002)(磷脂酰肌醇 3-激酶抑制剂)可拮抗胰岛素或 IGF-I 引起的糖原合酶激活。接下来,我们检查了 pp70 S6 激酶(渥曼青霉素/LY294002 敏感信号分子之一)对糖原合酶激活的贡献。免疫抑制剂雷帕霉素完全阻断胰岛素或IGF-I对pp70 S6激酶的激活,但单独使用雷帕霉素或与负显性Ras的诱导组合不能拮抗这些激素对糖原合酶的激活。这些数据表明:1) Ras-MAP 激酶的激活对于糖原合酶的刺激不是必需的,2) 渥曼青霉素/LY294002 敏感途径的激活(独立于 pp70 S6 激酶)在 PC12 细胞的糖原合酶调节中发挥关键作用。
This study was undertaken to define intracellular signaling pathways upstream to glycogen synthase activation. First, we examined the role of the two pathways of insulin signaling, Ras-dependent and wortmannin/LY294002-sensitive, in glycogen synthase activation. Although negative dominant Ras (Ras17N) induction in PC12 cells markedly decreased activities of mitogen-activated protein kinase (MAP) and pp90 S6 kinase in response to insulin or insulin-like growth factor I (IGF-I), activation of glycogen synthase by these agents was unaffected by negative dominant Ras induction. In contrast, wortmannin and 2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one (LY294002), inhibitors of phosphatidylinositol 3-kinase, antagonized glycogen synthase activation in response to insulin or IGF-I. Next, we examined the contribution of pp70 S6 kinase, one of the wortmannin/LY294002-sensitive signaling molecules on glycogen synthase activation. Immunosuppressant rapamycin completely blocked activation of pp70 S6 kinase by insulin or IGF-I, but rapamycin alone or in combination with induction of negative dominant Ras failed to antagonize glycogen synthase activation by these hormones. These data suggest that 1) activation of Ras-MAP kinase is not necessary for stimulation of glycogen synthase and 2) activation of wortmannin/LY294002sensitive pathway, independent of pp70 S6 kinase, plays a key role in glycogen synthase regulation in PC12 cells.
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发表时间: 1987-02
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影响因子: --
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DOI: --
发表时间: 1993
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发表时间: 1987
期刊: The Journal of biological chemistry
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DOI: 10.1016/j.cellbi.2007.01.033
发表时间: 2007
影响因子: 3.9
作者:
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