Miz1 is a critical repressor of cdkn1a during skin tumorigenesis.

Miz1 is a critical repressor of cdkn1a during skin tumorigenesis.
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DOI:
10.1371/journal.pone.0034885
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Elsässer HP
Elsässer HP
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hönnemann J;Sanz-Moreno A;Wolf E;Eilers M;Elsässer HP

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转录因子Miz 1与Myc、Gfi-1和Bcl-6癌蛋白形成抑制性DNA结合复合物。这些复合物的已知靶基因编码细胞周期蛋白依赖性激酶抑制剂(CKIs)cdkn 2b(p15 Ink 4)、cdkn 1a(p21 Cip 1)和cdkn 1c(p57 Kip 2)。Miz 1介导的抑制是否对控制体内细胞增殖和肿瘤形成很重要尚不清楚。在这里,我们表明,删除Miz 1 POZ域,这是Miz 1功能的关键,抑制皮肤肿瘤的化学诱导,Ras依赖性肿瘤发生模型的发展。虽然干细胞区室似乎不受影响,但缺乏功能性Miz 1的滤泡间角质形成细胞表现出对肿瘤促进剂12-O-十四烷酰基佛波醇-13-乙酸酯(TPA)的反应,从而减少了表皮的增殖和加速了表皮的分化。肿瘤发生、增殖和正常分化在缺乏cdkn 1a的动物中得以恢复,但在缺乏cdkn 2b的动物中则不然。我们的数据表明,Miz 1介导的衰减细胞周期阻滞途径通过抑制cdkn 1a在皮肤肿瘤发生过程中具有关键作用。
The transcription factor Miz1 forms repressive DNA-binding complexes with the Myc, Gfi-1 and Bcl-6 oncoproteins. Known target genes of these complexes encode the cyclin-dependent kinase inhibitors (CKIs) cdkn2b (p15Ink4), cdkn1a (p21Cip1), and cdkn1c (p57Kip2). Whether Miz1-mediated repression is important for control of cell proliferation in vivo and for tumor formation is unknown. Here we show that deletion of the Miz1 POZ domain, which is critical for Miz1 function, restrains the development of skin tumors in a model of chemically-induced, Ras-dependent tumorigenesis. While the stem cell compartment appears unaffected, interfollicular keratinocytes lacking functional Miz1 exhibit a reduced proliferation and an accelerated differentiation of the epidermis in response to the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA). Tumorigenesis, proliferation and normal differentiation are restored in animals lacking cdkn1a, but not in those lacking cdkn2b. Our data demonstrate that Miz1-mediated attenuation of cell cycle arrest pathways via repression of cdkn1a has a critical role during tumorigenesis in the skin.
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