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首页> 外文期刊>Molecular cell >The Peutz-Jegher gene product LKB1 is a mediator of p53-dependent cell death.
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The Peutz-Jegher gene product LKB1 is a mediator of p53-dependent cell death.

机译:Peutz-Jegher基因产物LKB1是p53依赖性细胞死亡的介体。

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摘要

Here, we investigate the mechanism and function of LKB1, a Ser/Thr kinase mutated in Peutz-Jegher syndrome (PJS). We demonstrate that LKB1 physically associates with p53 and regulates specific p53-dependent apoptosis pathways. LKB1 protein is present in both the cytoplasm and nucleus of living cells and translocates to mitochondria during apoptosis. In vivo, LKB1 is highly upregulated in pyknotic intestinal epithelial cells. In contrast, polyps arising in Peutz-Jegher patients are devoid of LKB1 staining and have reduced numbers of apoptotic cells. We propose that a deficiency in apoptosis is a key factor in the formation of multiple benign intestinal polyps in PJS patients, and possibly for the subsequent development of malignant tumors in these patients.
机译:在这里,我们研究了LKB1的机制和功能,LKB1是一种在Peutz-Jegher综合征(PJS)中突变的Ser / Thr激酶。我们证明,LKB1物理关联p53,并调节特定的p53依赖性细胞凋亡途径。 LKB1蛋白存在于活细胞的细胞质和细胞核中,在凋亡过程中易位至线粒体。在体内,LKB1在强直性肠上皮细胞中高度上调。相反,在Peutz-Jegher患者中出现的息肉没有LKB1染色,凋亡细胞数量减少。我们认为细胞凋亡的缺乏是PJS患者多发良性肠息肉形成的关键因素,并且可能是这些患者随后发生恶性肿瘤的关键因素。

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