IRE1 phosphatase PP2Ce regulates adaptive ER stress response in the postpartum mammary gland.

IRE1 phosphatase PP2Ce regulates adaptive ER stress response in the postpartum mammary gland.
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DOI:
10.1371/journal.pone.0111606
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Wang Y
Wang Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ren S;Lu G;Ota A;Zhou ZH;Vondriska TM;Lane TF;Wang Y

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我们最近报道了PPM1l基因编码内质网(ER)膜靶向蛋白磷酸酶(PP2Ce),对肌醇要求蛋白1 (IRE1)具有高度特异性活性,并调节内质网应激的功能结果。在本报告中,我们发现PP2Ce蛋白在乳腺泌乳上皮中高表达。体内PP2Ce缺失会损害生理未折叠蛋白反应(UPR),诱导应激激酶激活,导致泌乳乳腺泌乳量减少,诱导上皮细胞凋亡。本研究首次在体内证明PP2Ce是正常泌乳的重要调节因子,可能涉及乳腺上皮IRE1信号和内质网应激调节。
We recently reported that the PPM1l gene encodes an endoplasmic reticulum (ER) membrane targeted protein phosphatase (named PP2Ce) with highly specific activity towards Inositol-requiring protein-1 (IRE1) and regulates the functional outcome of ER stress. In the present report, we found that the PP2Ce protein is highly expressed in lactating epithelium of the mammary gland. Loss of PP2Ce in vivo impairs physiological unfolded protein response (UPR) and induces stress kinase activation, resulting in loss of milk production and induction of epithelial apoptosis in the lactating mammary gland. This study provides the first in vivo evidence that PP2Ce is an essential regulator of normal lactation, possibly involving IRE1 signaling and ER stress regulation in mammary epithelium.
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