Loss of the Par3 polarity protein promotes breast tumorigenesis and metastasis.

Loss of the Par3 polarity protein promotes breast tumorigenesis and metastasis.
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DOI:
10.1016/j.ccr.2012.10.003
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发表时间:
2012-11-13
期刊:
影响因子:
50.3
通讯作者:
Macara IG
Macara IG
中科院分区:
医学1区
文献类型:
--
作者:
McCaffrey LM;Montalbano J;Mihai C;Macara IG

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上皮组织的丧失是癌的标志,但极性是否调节肿瘤生长和转移知之甚少。为了解决这个问题,我们通过RNAi结合致癌Notch或Ras 61 L表达来耗尽鼠乳腺中的Par 3极性基因。在两种模型中,Par 3沉默显著降低了肿瘤潜伏期,并产生了保留上皮标志物表达的侵袭性和转移性肿瘤。Par 3缺失与MMP 9的诱导、细胞外基质的破坏和侵袭相关,所有这些都由非典型PKC依赖性JAK/Stat 3活化介导。重要的是,Par 3表达在人乳腺癌中显著降低,这与活性aPKC和Stat 3相关。这些数据将Par 3鉴定为与浸润性乳腺癌相关的信号通路的调节剂。
Loss of epithelial organization is a hallmark of carcinomas, but whether polarity regulates tumor growth and metastasis is poorly understood. To address this issue we depleted the Par3 polarity gene by RNAi in combination with oncogenic Notch or Ras61L expression in the murine mammary gland. Par3 silencing dramatically reduced tumor latency in both models, and produced invasive and metastatic tumors that retained epithelial marker expression. Par3 depletion was associated with induction of MMP9, destruction of the extracellular matrix, and invasion, all mediated by atypical PKC-dependant JAK/Stat3 activation. Importantly, Par3 expression is significantly reduced in human breast cancers, which correlates with active aPKC and Stat3. These data identify Par3 as a regulator of signaling pathways relevant to invasive breast cancer.
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