Thrombospondin-1 is the key activator of TGF-beta1 in human mesangial cells exposed to high glucose.

Thrombospondin-1 is the key activator of TGF-beta1 in human mesangial cells exposed to high glucose.
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Thrombospondin-1 是暴露于高葡萄糖的人系膜细胞中 TGF-β1 的关键激活剂。

DOI:
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发表时间:
2001
影响因子:
13.6
通讯作者:
R. Mason
R. Mason
中科院分区:
医学1区
文献类型:
--
作者:
N. Yevdokimova;N. Wahab;R. Mason

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在含有高浓度葡萄糖的培养基中培养的人肾小球系膜细胞合成水平升高的转化生长因子-β 1(TGF-β 1),并介导纤维连接蛋白(FN)、纤溶酶原激活物抑制剂-1(派-1)的合成增加以及其他基因表达的变化。TGF-β 1作为潜在复合物合成。以前的研究表明,高糖条件下也上调血小板反应蛋白-1(TSP-1)的表达,TSP-1是潜在的TGF-β 1激活剂。使用合成肽GGWSHW,TSP-1激活机制的抑制剂,内源性TSP-1被证明是负责将高水平的潜伏性TGF-β 1转化为生物活性生长因子超过3周的系膜细胞暴露于30 mM D-葡萄糖。肽抑制TGF-β 1激活TSP-1在高糖条件下完全抑制FN和派-1表达的增加。用TSP-1反义寡核苷酸处理维持在高葡萄糖中的系膜细胞可将TSP-1表达降低至4 mM D-葡萄糖培养物中的水平,阻止TGF-β 1活化,并使FN表达正常化。
Elevated levels of transforming growth factor-beta1 (TGF-beta1) are synthesized by human mesangial cells that are cultured in medium that contains high concentrations of glucose and mediate increased synthesis of fibronectin (FN), plasminogen activator inhibitor-1 (PAI-1), and changes in the expression of other genes. TGF-beta1 is synthesized as a latent complex. Previous work indicated that high-glucose conditions also upregulate expression of thrombospondin-1 (TSP-1), a potential activator of latent TGF-beta1. With the use of the synthetic peptide GGWSHW, an inhibitor of the TSP-1 activation mechanism, endogenous TSP-1 is shown to be responsible for converting high levels of latent TGF-beta1 to bioactive growth factor over 3 wk of exposure of mesangial cells to 30 mM D-glucose. Peptide inhibition of TGF-beta1 activation by TSP-1 in high-glucose conditions completely suppressed increases in FN and PAI-1 expression. Treating mesangial cells maintained in high glucose with a TSP-1 antisense oligonucleotide reduced TSP-1 expression to levels found in 4 mM D-glucose cultures, prevented TGF-beta1 activation, and normalized expression of FN.
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