LGR4是肝脏葡萄糖生成的关键调节剂
Qianhua Fang1, Linmin Ye1, Luyu Han2
1Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai National Clinical Research Center for Metabolic Diseases, Key Laboratory for Endocrine and Metabolic Diseases of the National Health Commission of the PR China, Shanghai Key Laboratory for Endocrine Tumor, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
富含白的重复含有G蛋白结合受体4 (LGR4) 调节肝脏葡萄糖的产生. 向LGR4提供了一种潜在的治疗策略,通过控制肝脏葡萄糖代谢来控制糖尿病.
科学领域:
- 内分泌学 在内分泌学.
- 代谢障碍 代谢障碍 代谢障碍
- 肝病学 肝病学是一种肝病学.
背景情况:
- 氨酸丰富的重复含有G蛋白结合受体4 (LGR4) 与内分泌和代谢障碍有关.
- LGR4在肝脏葡萄糖代谢中的确切作用尚不清楚.
- 研究LGR4在肝脏中的功能对于理解新陈代谢调节至关重要.
研究的目的:
- 为了确定LGR4是否调节肝脏葡萄糖的产生.
- 阐明LGR4介导的葡萄糖代谢中涉及的特定信号通路.
- 评估LGR4在肥胖和高脂肪饮食背景中的作用.
主要方法:
- 在肥胖小鼠模型中检查了肝脏葡萄糖的产生和葡萄糖原性基因表达,使用沉默的LGR4.
- 产生并分析全身LGR4缺乏 (LGR4KO),肝脏特异性LGR4淘汰 (LGR4LKO) 和肝脏特异性LGR4过度表达 (LGR4LOV) 的小鼠.
- 使用实时成像和对肝脏基酸碳酸酶 (PEPCK) - 露西法酶活性进行定量分析.
主要成果:
- 在肥胖小鼠肝脏中,LGR4表达被上调,并且随着营养状况的变化而动态变化.
- 缺乏LGR4 (全球和肝脏特异性) 改善了葡萄糖耐受性和降低了肝脏葡萄糖生成,由减少PEPCK表达体现.
- 过度表达LGR4增加了葡萄糖生成和PEPCK表达,扭转了淘汰赛效应.
- 确定了Wnt/β-catenin/TCF7L2通路,而不是RANKL或PKA,作为LGR4调节肝脏葡萄糖生成的机制.
结论:
- LGR4在调节肝脏葡萄糖生成方面发挥着重要作用.
- Wnt/β-catenin/TCF7L2信号通路调解LGR4对肝脏葡萄糖生产的影响.
- LGR4代表了糖尿病管理的潜在治疗标.
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