...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >APC-dependent suppression of colon carcinogenesis by PPAR_γ
【24h】

APC-dependent suppression of colon carcinogenesis by PPAR_γ

机译:PPAR_γ抑制APC依赖性结肠癌的发生

获取原文
获取原文并翻译 | 示例
           

摘要

Activation of PPAR_γ by synthetic ligands, such as thiazolidinedio-nes, stimulates adipogenesis and improves insulin sensitivity. Although thiazolidinediones represent a major therapy for type 2 diabetes, conflicting studies showing that these agents can increase or decrease colonic tumors in mice have raised concerns about the role of PPAR_γ in colon cancer. To analyze critically the role of this receptor, we have used mice heterozygous for Ppar_γ with both chemical and genetic models of this malignancy. Heterozygous loss of PPAR_γ causes an increase in β-catenin levels and a greater incidence of colon cancer when animals are treated with azoxymethane. However, mice with preexisting damage to Apc, a regulator of β-catenin, develop tumors in a manner insensitive to the status of PPAR_γ. These data show that PPAR_γ can suppress β-catenin levels and colon carcinogenesis but only before damage to the APC/β-catenin pathway. This finding suggests a potentially important use for PPAR_γ ligands as chemopreventative agents in colon cancer.
机译:合成配体(如噻唑烷二酮)对PPAR_γ的激活可刺激脂肪形成并改善胰岛素敏感性。尽管噻唑烷二酮是2型糖尿病的主要治疗方法,但相互矛盾的研究表明这些药物可增加或减少小鼠结肠肿瘤,这引起了人们对PPAR_γ在结肠癌中作用的担忧。为了严格分析这种受体的作用,我们使用了具有这种恶性化学模型和遗传模型的Ppar_γ杂合小鼠。当用乙氧基甲烷处理动物时,PPAR_γ的杂合损失会导致β-连环蛋白水平升高,结肠癌的发生率也会增加。但是,已经对Apc(β-连环蛋白的调节剂)造成损伤的小鼠以对PPAR_γ状态不敏感的方式发展肿瘤。这些数据表明,PPAR_γ可以抑制β-catenin水平和结肠癌发生,但仅在APC /β-catenin途径受损之前。这一发现表明,PPAR_γ配体在结肠癌中作为化学预防剂具有潜在的重要用途。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号