ARRDC3 suppresses breast cancer progression by negatively regulating integrin beta4.

ARRDC3 suppresses breast cancer progression by negatively regulating integrin beta4.
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DOI:
10.1038/onc.2010.250
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发表时间:
2010-09-09
期刊:
影响因子:
8
通讯作者:
Lyle, S.
Lyle, S.
中科院分区:
医学1区
文献类型:
--
作者:
Draheim, K. M.;Chen, H-B;Tao, Q.;Moore, N.;Roche, M.;Lyle, S.

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对人类肿瘤样本的大规模遗传分析已被用于鉴定新的癌基因、肿瘤抑制因子和预后因子,但许多单个基因的功能和分子相互作用尚未确定。在这项研究中,我们研究了arrestin家族成员ARRDC 3的细胞效应和分子机制,ARRDC 3是一种在乳腺癌中优先丢失的基因。Oncomine数据显示,ARRDC 3的表达随着肿瘤分级、转移和复发而降低。ARRDC 3过表达抑制癌细胞增殖、迁移、侵袭、在软琼脂中的生长和体内致瘤性,而ARRCD 3的下调具有相反的作用。机制研究表明,ARRDC 3在一种新的调节途径中发挥作用,该途径控制细胞表面粘附分子β-4整合素(ITGβ4),这是一种与侵袭性肿瘤行为相关的蛋白质。我们的数据表明,ARRDC 3直接与ITGβ4的磷酸化形式结合,导致其内化,泛素化和最终降解。研究结果将ARRCD 3-ITGβ4通路确定为乳腺癌的新治疗靶点,并显示了将基因阵列与机制研究联系起来寻找新治疗方法的重要性。
Large-scale genetic analyses of human tumor samples have been used to identify novel oncogenes, tumor suppressors and prognostic factors, but the functions and molecular interactions of many individual genes have not been determined. In this study we examined the cellular effects and molecular mechanism of the arrestin family member, ARRDC3, a gene preferentially lost in a subset of breast cancers. Oncomine data revealed that the expression of ARRDC3 decreases with tumor grade, metastases and recurrences. ARRDC3 overexpression represses cancer cell proliferation, migration, invasion, growth in soft agar and in vivo tumorigenicity, whereas downregulation of ARRCD3 has the opposite effects. Mechanistic studies showed that ARRDC3 functions in a novel regulatory pathway that controls the cell surface adhesion molecule, β-4 integrin (ITGβ4), a protein associated with aggressive tumor behavior. Our data indicates ARRDC3 directly binds to a phosphorylated form of ITGβ4 leading to its internalization, ubiquitination and ultimate degradation. The results identify the ARRCD3-ITGβ4 pathway as a new therapeutic target in breast cancer and show the importance of connecting genetic arrays with mechanistic studies in the search for new treatments.
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