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首页> 外文期刊>Oncogene >Accelerated onsets of gastric hamartomas and hepatic adenomas|[sol]|carcinomas in Lkb1|[plus]||[sol]||[minus]|p53|[minus]||[sol]||[minus]| compound mutant mice
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Accelerated onsets of gastric hamartomas and hepatic adenomas|[sol]|carcinomas in Lkb1|[plus]||[sol]||[minus]|p53|[minus]||[sol]||[minus]| compound mutant mice

机译:Lkb1 | [plus] || [sol] | [minus] | p53 | [minus] || [sol] || [minus] |]中的胃错构瘤和肝腺瘤| [sol] |癌的发作加快复合突变小鼠

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摘要

Germline mutations in the LKB1 gene are responsible for Peutz–Jeghers syndrome (PJS), which is characterized by gastrointestinal hamartomas and increasing risk of cancer. Mice with Lkb1+/- mutation develop gastric hamartomas after >20 weeks of age, and hepatocellular adenomas and carcinomas >30 weeks. It has been reported that, in PJS patients, carcinomas progressed from hamartomas contain p53 mutations, and that LKB1 regulates p53-dependent apoptosis. To investigate the roles of LKB1 and p53 mutations in tumorigenesis, we constructed compound mutant mice of Lkb1 and p53 genes. In the Lkb1+/-p53-/- mice, formation of gastric hamartomas and hepatic tumors was accelerated. However, histopathology of hamartomas was similar between Lkb1+/-p53-/- and Lkb1+/- mice, and Lkb1 genotype remained heterozygous, suggesting that the p53 mutation affected hamartoma initiation. Contrary to the heterozygous hamartomas in the stomach and duodenum, the hepatic adenomas in Lkb1+/-p53-/- mice showed loss of Lkb1 heterozygosity (LOH), suggesting that lack of p53 stimulated Lkb1 LOH and tumor initiation in the liver. Taken together, these results indicate that lack of p53 causes earlier onsets of gastric hamartomas and hepatic tumors in Lkb1+/-p53-/- mice.
机译:LKB1基因中的生殖系突变是造成Peutz-Jeghers综合征(PJS)的原因,该综合征的特征是胃肠道错构瘤和癌症风险增加。具有Lkb1 +/-突变的小鼠在> 20周龄后发展为胃错构瘤,而肝细胞腺瘤和癌在> 30周后发展。据报道,在PJS患者中,从错构瘤发展而来的癌含有p53突变,并且LKB1调节p53依赖性细胞凋亡。为了研究LKB1和p53突变在肿瘤发生中的作用,我们构建了Lkb1和p53基因的复合突变小鼠。在Lkb1 +/- p53-/-小鼠中,胃错构瘤和肝肿瘤的形成加速。然而,在Lkb1 +/- p53-/-和Lkb1 +/-小鼠之间,错​​构瘤的组织病理学相似,并且Lkb1基因型仍然是杂合的,表明p53突变影响了错构瘤的发生。与胃和十二指肠中的杂合错构瘤相反,Lkb1 +/- p53-/-小鼠的肝腺瘤显示Lkb1杂合性(LOH)丧失,表明缺乏p53会刺激Lkb1 LOH和肝脏中的肿瘤发生。综上所述,这些结果表明p53的缺乏导致Lkb1 +/- p53-/-小鼠中胃错构瘤和肝肿瘤的早期发作。

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