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:
影响因子:
--
通讯作者:
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
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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DOI:
10.1016/s0021-9258(19)75716-0
发表时间:
1987-02
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
C. Chou;T. Dull;D. Russell;R. Gherzi;D. Lebwohl;A. Ullrich;O. Rosen
通讯作者:
C. Chou;T. Dull;D. Russell;R. Gherzi;D. Lebwohl;A. Ullrich;O. Rosen
DOI:
--
发表时间:
1994
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Lin,TA;LawrenceJr,JC
通讯作者:
LawrenceJr,JC
DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Robinson,LJ;Razzack,ZF;LawrenceJr,JC;James,DE
通讯作者:
James,DE
DOI:
--
发表时间:
1987
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Chan,CP;Bowen-Pope,DF;Ross,R;Krebs,EG
通讯作者:
Krebs,EG
影响因子:
3.9
作者:
Sattar,AkmA;Berhanu,Chali;Gebreselassie,Surafel;Berhanu,Paulos
通讯作者:
Berhanu,Paulos