The Pbx interaction motif of Hoxa1 is essential for its oncogenic activity.

The Pbx interaction motif of Hoxa1 is essential for its oncogenic activity.
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DOI:
10.1371/journal.pone.0025247
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Rezsohazy R
Rezsohazy R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Delval S;Taminiau A;Lamy J;Lallemand C;Gilles C;Noël A;Rezsohazy R

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Hoxa 1属于Hox家族的同源结构域转录因子,参与胚胎领域的模式化和控制器官发生过程。除了其发育功能,Hoxa 1已被证明是一种致癌基因,并在乳腺中过度表达,以响应自分泌生长激素的失调。因此,Hoxa 1在自分泌生长激素失调和乳腺癌发生过程中起着关键作用。与大多数Hox蛋白一样,Hoxa 1可以与Pbx蛋白相互作用。这种相互作用依赖于以保守的色氨酸和甲硫氨酸残基为中心的Hox六肽序列。为了解决Hoxa 1的致癌活性的Hox-Pbx的相互作用的重要性,我们在这里的特点的Hoxa 1变体的特性与取代的残基的六肽和证明,Hoxa 1突变体失去了刺激细胞增殖的能力,锚定独立的细胞生长,和接触抑制的损失。因此,需要Hoxa 1的六肽基序来赋予其致癌活性,支持这种活性依赖于Hoxa 1与Pbx相互作用的能力的观点。
Hoxa1 belongs to the Hox family of homeodomain transcription factors involved in patterning embryonic territories and governing organogenetic processes. In addition to its developmental functions, Hoxa1 has been shown to be an oncogene and to be overexpressed in the mammary gland in response to a deregulation of the autocrine growth hormone. It has therefore been suggested that Hoxa1 plays a pivotal role in the process linking autocrine growth hormone misregulation and mammary carcinogenesis. Like most Hox proteins, Hoxa1 can interact with Pbx proteins. This interaction relies on a Hox hexapeptidic sequence centred on conserved Tryptophan and Methionine residues. To address the importance of the Hox-Pbx interaction for the oncogenic activity of Hoxa1, we characterized here the properties of a Hoxa1 variant with substituted residues in the hexapeptide and demonstrate that the Hoxa1 mutant lost its ability to stimulate cell proliferation, anchorage-independent cell growth, and loss of contact inhibition. Therefore, the hexapeptide motif of Hoxa1 is required to confer its oncogenic activity, supporting the view that this activity relies on the ability of Hoxa1 to interact with Pbx.
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