Decorin is a novel antagonistic ligand of the Met receptor.

Decorin is a novel antagonistic ligand of the Met receptor.
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DOI:
10.1083/jcb.200901129
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发表时间:
2009-05-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Iozzo RV
Iozzo RV
中科院分区:
其他
文献类型:
--
作者:
Goldoni S;Humphries A;Nyström A;Sattar S;Owens RT;McQuillan DJ;Ireton K;Iozzo RV

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核心蛋白聚糖是富含亮氨酸的小分子蛋白聚糖基因家族的成员,通过下调表皮生长因子受体来抑制肿瘤细胞生长。核心蛋白聚糖具有复杂的结合库,因此,我们预测核心蛋白聚糖将调节其他酪氨酸激酶受体的生物活性。我们发现,核心蛋白聚糖直接结合,并具有高亲和力(Kd = 1.5 nM)的Met,肝细胞生长因子(HGF)的受体。核心蛋白聚糖与Met的结合被HGF有效地置换,而被内化蛋白B(一种细菌Met配体)置换的效率较低。核心蛋白聚糖与Met的相互作用诱导瞬时受体活化、E3泛素连接酶c-Cbl的募集和Met的快速细胞内降解(半衰期= 1.6 min)。核心蛋白聚糖抑制β-连环蛋白(一种已知的下游Met效应物)的细胞内水平,并抑制Met介导的细胞迁移和生长。因此,通过拮抗性靶向多种酪氨酸激酶受体,核心蛋白聚糖有助于减少原发性肿瘤生长和肿瘤扩散。
Decorin, a member of the small leucine-rich proteoglycan gene family, impedes tumor cell growth by down-regulating the epidermal growth factor receptor. Decorin has a complex binding repertoire, thus, we predicted that decorin would modulate the bioactivity of other tyrosine kinase receptors. We discovered that decorin binds directly and with high affinity (Kd = ∼1.5 nM) to Met, the receptor for hepatocyte growth factor (HGF). Binding of decorin to Met is efficiently displaced by HGF and less efficiently by internalin B, a bacterial Met ligand. Interaction of decorin with Met induces transient receptor activation, recruitment of the E3 ubiquitin ligase c-Cbl, and rapid intracellular degradation of Met (half-life = ∼6 min). Decorin suppresses intracellular levels of β-catenin, a known downstream Met effector, and inhibits Met-mediated cell migration and growth. Thus, by antagonistically targeting multiple tyrosine kinase receptors, decorin contributes to reduction in primary tumor growth and metastastic spreading.
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