在PPARα-依赖的线粒体编程的局限性限制了人类干细胞衍生β细胞的分化
Anne C Lietzke1,2, Emily M Walker1, Elizabeth Bealer3
1Division of Metabolism, Endocrinology and Diabetes and Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA.
Nature communications
|December 10, 2025
概括
多能干细胞衍生的β细胞显示线粒体功能不成熟,阻碍1型糖尿病 (T1D) 治疗. 激活PPARα可以增强线粒体编程,改善β细胞发育和胰岛素分泌,用于T1D治疗.
科学领域:
- 细胞生物学 细胞生物学
- 代谢性疾病研究研究
- 再生医学是一种再生医学.
背景情况:
- 多能干细胞衍生小岛是1型糖尿病 (T1D) 中β细胞替代的潜在可再生来源.
- 这些细胞的功能和代谢不成熟可能会限制它们的治疗效果.
- 线粒体转录编程对于细胞功能和分化至关重要.
研究的目的:
- 研究线粒体转录编程在干细胞衍生的β (SC-β) 细胞的功能和代谢不成熟中的作用.
- 为了确定限制SC-β细胞发育和功能的因素.
- 探索治疗策略,以提高SC-β细胞成熟和T1D治疗的疗效.
主要方法:
- 转录形状分析用于分析基因表达模式.
- 染色体可访问性测试用于评估调节元件的活动.
- 线粒体表型和脂质组学以评估代谢功能.
- 在体外和体外使用PPARα激动剂 (WY14643) 治疗的研究.
主要成果:
- 与初级人类小岛相比,SC-β细胞的氧化和线粒体脂肪酸代谢因线粒体转录网络受损而减少.
- 在SC群岛中,葡萄糖刺激的线粒体呼吸减少与线粒体质量,结构或基因组完整性的变化无关.
- 在SC岛群中观察到PPARα标的有限表达,这表明它在线粒体编程和β细胞分化中的作用.
- PPARα激动剂治疗增强了线粒体基因表达,改善了胰岛素分泌,并在体外和移植后增加了SC-β细胞的形成.
结论:
- 缺陷的线粒体转录编程,特别是涉及PPARα,限制了干细胞衍生的β细胞的功能成熟.
- PPARα激活代表了一个有前途的治疗点,用于改善SC-β细胞的分化和功能,用于T1D替代疗法.
- 增强线粒体编程是克服目前1型糖尿病的干细胞衍生β细胞疗法的局限性的关键.
相关概念视频
01:23Tissue Renewal without Stem Cells
2.1K
After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
However, failure of such a system...
However, failure of such a system...
2.1K
01:28Forced Transdifferentiation
2.3K
Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial...
Artificial...
2.3K
01:22iPS Cell Differentiation
3.0K
The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
3.0K