共 36 条
Attenuation of insulin-stimulated insulin receptor substrate-1 serine 307 phosphorylation in insulin resistance of type 2 diabetes
被引:67
作者:

Danielsson, A
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机构: Linkoping Univ, Dept Cell Biol, SE-58185 Linkoping, Sweden

Öst, A
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h-index: 0
机构: Linkoping Univ, Dept Cell Biol, SE-58185 Linkoping, Sweden

Nystrom, FH
论文数: 0 引用数: 0
h-index: 0
机构: Linkoping Univ, Dept Cell Biol, SE-58185 Linkoping, Sweden

Strålfors, P
论文数: 0 引用数: 0
h-index: 0
机构: Linkoping Univ, Dept Cell Biol, SE-58185 Linkoping, Sweden
机构:
[1] Linkoping Univ, Dept Cell Biol, SE-58185 Linkoping, Sweden
[2] Linkoping Univ, Diabet Res Ctr, SE-58185 Linkoping, Sweden
关键词:
D O I:
10.1074/jbc.C500230200
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
Insulin resistance is a primary characteristic of type 2 diabetes and likely causally related to the pathogenesis of the disease. It is a result of defects in signal transduction from the cell surface receptor of insulin to target effects. We found that insulin-stimulated phosphorylation of serine 307 ( corresponding to serine 302 in the murine sequence) in the immediate downstream mediator protein of the insulin receptor, insulin receptor substrate-1 (IRS1), is required for efficient insulin signaling and that this phosphorylation is attenuated in adipocytes from patients with type 2 diabetes. Inhibition of serine 307 phosphorylation by rapamycin mimicked type 2 diabetes and reduced the sensitivity of IRS1 tyrosine phosphorylation in response to insulin, while stimulation of the phosphorylation by okadaic acid, in cells from patients with type 2 diabetes, rescued cells from insulin resistance. EC50 for insulin-stimulated phosphorylation of serine 307 was about 0.2 nM with a t(1/2) of about 2 min. The amount of IRS1 was similar in cells from non-diabetic and diabetic subjects. These findings identify a molecular mechanism for insulin resistance in non-selected patients with type 2 diabetes.
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页码:34389 / 34392
页数:4
相关论文
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