Miz1 deficiency in the mammary gland causes a lactation defect by attenuated Stat5 expression and phosphorylation.

Miz1 deficiency in the mammary gland causes a lactation defect by attenuated Stat5 expression and phosphorylation.
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DOI:
10.1371/journal.pone.0089187
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发表时间:
2014
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:
Sanz-Moreno A;Fuhrmann D;Wolf E;von Eyss B;Eilers M;Elsässer HP

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Miz1 是一种锌指转录因子,具有 N 末端 POZ 结构域。与 Myc、Bcl-6 或 Gfi-1 的复合物会抑制 Cdkn2b (p15Ink4) 或 Cdkn1a (p21Cip1) 等基因的表达。 Miz1 在正常乳腺发育中的作用迄今为止尚未得到解决。怀孕期间条件性敲除管腔细胞中的 Miz1 POZ 结构域会导致泌乳缺陷,导致腺体组织短暂减少、增殖减少和分化减弱。使用小鼠乳腺来源的 HC11 细胞在体外重现了这一点。进一步分析显示,Miz1ΔPOZ 乳腺中 Stat5 活性降低,Stat5 靶标表达减弱。催乳素受体 (PrlR) 和 ErbB4 的基因表达在 Miz1ΔPOZ 雌性中降低,这两个受体对于 Stat5 磷酸化 (pStat5) 或 pStat5 核转位至关重要。微阵列、ChIP-Seq 和基因集富集分析揭示了参与囊泡运输过程的 Miz1 靶基因的下调。我们的数据表明,PrlR 和 ErbB4 的细胞内运输和定位紊乱会破坏突变腺体中的 Stat5 信号通路,并导致观察到的泌乳表型。
Miz1 is a zinc finger transcription factor with an N-terminal POZ domain. Complexes with Myc, Bcl-6 or Gfi-1 repress expression of genes like Cdkn2b (p15Ink4) or Cdkn1a (p21Cip1). The role of Miz1 in normal mammary gland development has not been addressed so far. Conditional knockout of the Miz1 POZ domain in luminal cells during pregnancy caused a lactation defect with a transient reduction of glandular tissue, reduced proliferation and attenuated differentiation. This was recapitulated in vitro using mouse mammary gland derived HC11 cells. Further analysis revealed decreased Stat5 activity in Miz1ΔPOZ mammary glands and an attenuated expression of Stat5 targets. Gene expression of the Prolactin receptor (PrlR) and ErbB4, both critical for Stat5 phosphorylation (pStat5) or pStat5 nuclear translocation, was decreased in Miz1ΔPOZ females. Microarray, ChIP-Seq and gene set enrichment analysis revealed a down-regulation of Miz1 target genes being involved in vesicular transport processes. Our data suggest that deranged intracellular transport and localization of PrlR and ErbB4 disrupt the Stat5 signalling pathway in mutant glands and cause the observed lactation phenotype.
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