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首页> 外文期刊>Cellular Signalling >Alternative splicing of KAI1 abrogates its tumor-suppressive effects on integrin alpha v beta 3-mediated ovarian cancer biology
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Alternative splicing of KAI1 abrogates its tumor-suppressive effects on integrin alpha v beta 3-mediated ovarian cancer biology

机译:KAI1的选择性剪接取消了其对整联蛋白αv beta 3介导的卵巢癌生物学的肿瘤抑制作用

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Loss or downregulation of the tumor-suppressor KAI1 correlates with poor cancer patient prognosis. KAI1 functions by interacting with other proteins, including integrin cell adhesion and signaling receptors. We previously showed that KAI1 physically and functionally crosstalks with the tumor-biologically relevant integrin alpha v beta 3, thereby suppressing ovarian cancer cell migration and proliferation. Interestingly, in metastases, a KAI1 splice variant had been identified, indicating poor patient prognosis. Thus, we here characterized differential effects of the two KAI1 proteins upon their cellular restoration. Opposite to KAI1, KAI1-splice reduced alpha v beta 3-mediated cell adhesion, thereby inducing cell migration. This was accompanied by elevated alpha v beta 3 levels and drastically elevated focal adhesion kinase activation, however, without any obvious colocalization with alpha v beta 3, as observed for KAI1. Moreover, codistribution of KAI1 with the cell/cell-adhesion molecule E-cadherin was abrogated in KAI1-splice. Whereas KAI1 diminished cell proliferative activity, KAI1-splice prominently enhanced cell proliferation concomitant with elevated transcription and cell-surface expression of the epidermal growth factor receptor. Thus KAI1-splice does not only counteract the tumor-suppressive actions of KAI1, but - beyond that - promotes alpha v beta 3-mediated biological functions in favor of tumor progression and metastasis. (C) 2014 Elsevier Inc All rights reserved.
机译:肿瘤抑制因子KAI1的丢失或下调与癌症患者的预后不良有关。 KAI1通过与其他蛋白(包括整联蛋白细胞粘附和信号受体)相互作用而发挥作用。我们先前显示,KAI1在物理和功能上与肿瘤生物学相关的整联蛋白αv beta 3相互干扰,从而抑制了卵巢癌细胞的迁移和增殖。有趣的是,在转移中,已鉴定出KAI1剪接变体,表明患者预后不良。因此,我们在这里表征了两种KAI1蛋白对其细胞修复的不同作用。与KAI1相反,KAI1剪接降低了αvβ3介导的细胞粘附,从而诱导了细胞迁移。这伴随着αvbeta 3水平的升高和粘着斑激酶活化的急剧升高,但是,与KAI1相比,αvbeta 3没有明显的共定位。此外,在KAI1剪接中废除了KAI1与细胞/细胞粘附分子E-钙粘着蛋白的共分布。 KAI1减少了细胞的增殖活性,而KAI1剪接显着增强了细胞的增殖,并伴随着表皮生长因子受体的转录和细胞表面表达的升高。因此,KAI1剪接不仅可以抵消KAI1的肿瘤抑制作用,而且还可以促进αv beta 3介导的生物学功能,有利于肿瘤的进展和转移。 (C)2014 Elsevier Inc保留所有权利。

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