共 30 条
Effects of Insulin and Free Fatty Acids on Matrix Metalloproteinases
被引:11
作者:

Boden, Guentber
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机构:
Temple Univ Hosp & Med Sch, Philadelphia, PA 19140 USA Temple Univ Hosp & Med Sch, Philadelphia, PA 19140 USA

Song, Wei Wei
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机构:
Temple Univ Hosp & Med Sch, Philadelphia, PA 19140 USA Temple Univ Hosp & Med Sch, Philadelphia, PA 19140 USA
机构:
[1] Temple Univ Hosp & Med Sch, Philadelphia, PA 19140 USA
基金:
美国国家卫生研究院;
关键词:
D O I:
10.1007/s11892-008-0041-y
中图分类号:
R5 [内科学];
学科分类号:
1002 ;
100201 ;
摘要:
To investigate if increased activation of matrix metalloproteinases (MMPs) may contribute to the large cardiovascular risk associated with obesity-related insulin resistance, we examined the effects of physiologically elevated levels of insulin and free fatty acid (FFA) on three MMPs and their physiologic inhibitors (tissue inhibitors of MMP [TIMPs]) in aortic tissue of male rats during euglycemic-hyperinsulinemic clamping. Hyper-insulinemia increased the active forms of MMP-2 (similar to sixfold), MMP-9 (similar to 13-fold), and membrane type 1-MMP (MT1-MMP; similar to eightfold) (all Western blots), and the gelatinolytic activity (zymography) of MMP-2 (twofold); it did not affect TIMP-1 and TIMP-2. FFA augmented the insulin-mediated increases in MMP-2 (from similar to six- to similar to 11-fold), MMP-9 (from similar to 13- to similar to 23-fold), MTI-MMP (from similar to eight- to similar to 20-fold), and MMP-2 gelatinolytic activity (from two- to threefold). FFA also increased JNK and p38 mitogen-activated protein kinase activities. The insulin and FFA-induced hyperactivity of three proatherogenic MMPs in vascular tissues may promote degradation of extracellular matrix over time, leading to thinning of atherosclerotic capsules and acute vascular problems.
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页码:239 / 242
页数:4
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