Okadaic Acid Exerts a Full Insulin-like Effect on Glucose Transport and Glucose Transporter 4 Translocation in Human Adipocytes

Okadaic Acid Exerts a Full Insulin-like Effect on Glucose Transport and Glucose Transporter 4 Translocation in Human Adipocytes
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冈田酸对人脂肪细胞中的葡萄糖转运和葡萄糖转运蛋白 4 易位发挥完全类似胰岛素的作用

DOI:
10.1074/jbc.271.30.18148
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发表时间:
1996
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
Ulf Smith
Ulf Smith
中科院分区:
--
文献类型:
--
作者:
C. Rondinone;Ulf Smith

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在人脂肪细胞中检查了丝氨酸/苏氨酸磷酸酶抑制剂、冈田酸和胰岛素对葡萄糖转运活性、葡萄糖转运蛋白 4 易位至质膜以及胰岛素信号传导途径的影响。冈田酸在葡萄糖转运速率方面始终比胰岛素产生更大的增加,并且两种药物一起具有部分累加效应。单独的胰岛素和单独的大田酸均刺激葡萄糖转运蛋白4易位至质膜。胰岛素(而非冈田酸)刺激磷脂酰肌醇 3-激酶(PI 3-激酶)活性,而渥曼青霉素则完全抑制胰岛素对葡萄糖转运的作用。当细胞与两种药物一起孵育时,大田酸抑制胰岛素刺激的 PI 3-激酶活性,但不阻断 PI 3-激酶的 p85 或 p110 亚基与胰岛素受体底物 1 的结合。大田酸仅轻微降低胰岛素刺激的胰岛素受体底物 1 的酪氨酸磷酸化 (15-30%)。这些数据表明,大田酸发挥完全的胰岛素样作用,不依赖于 PI 3-激酶的激活。因此,PI 3-激酶脂质激酶对于人类脂肪细胞中葡萄糖转运蛋白4易位不是必需的,并且存在导致葡萄糖转运蛋白4易位和增加葡萄糖转运的不同途径。
The effects of the serine/threonine phosphatase inhibitor, okadaic acid, and insulin on glucose transport activity, glucose transporter 4 translocation to the plasma membrane, and the signaling pathway of insulin were examined in human adipocytes. Okadaic acid consistently produced a greater increase than insulin in the rate of glucose transport, and both agents together had a partial additive effect. Both insulin alone and okadaic acid alone stimulated the translocation of glucose transporter 4 to the plasma membrane. Insulin, but not okadaic acid, stimulated phosphatidylinositol 3-kinase (PI 3-kinase) activity, and wortmannin completely inhibited the effect of insulin on glucose transport. When the cells were incubated with both agents, okadaic acid inhibited insulin-stimulated PI 3-kinase activity but did not block the association of the p85 or p110 subunits of PI 3-kinase with insulin receptor substrate 1. Insulin-stimulated tyrosine phosphorylation of insulin receptor substrate 1 was only slightly reduced (15-30%) by okadaic acid. These data demonstrate that okadaic acid exerts a full insulin-like effect independent of the activation of PI 3-kinase. Thus, PI 3-kinase lipid kinase is not essential for glucose transporter 4 translocation in human adipocytes, and different pathways exist that lead to glucose transporter 4 translocation and increased glucose transport.
DOI: 10.1016/s0021-9258(19)61974-5
发表时间: 1994-11
期刊: The Journal of biological chemistry
影响因子: --
作者:
M. G. Myers;T. Grammer;Ling-mei Wang;X. Sun;J. Pierce;J. Blenis;M. White
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冈田酸在大鼠脂肪细胞中刺激葡萄糖转运和葡萄糖转运蛋白磷酸化。
DOI: --
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影响因子: --
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DOI: --
发表时间: 1991
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影响因子: --
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DOI: 10.1016/s0021-9258(17)42297-6
发表时间: 1994-01
期刊: The Journal of biological chemistry
影响因子: --
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DOI: 10.1172/jci117909
发表时间: 1995-05-01
影响因子: 15.9
作者:
GOODYEAR, LJ;GIORGINO, F;DOHM, GL
通讯作者: DOHM, GL