在广泛使用的肝细胞模型中,尿素循环的表达和功能
Georgios Makris1,2, Lara Veit1, Véronique Rüfenacht1
1Division of Metabolism and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland.
Journal of inherited metabolic disease
|January 9, 2024
概括
肝脏RG细胞是研究尿素循环障碍 (UCD) 的可行模型,在临床前研究中有效模仿肝脏功能. 这些细胞为其他模型提供了更可靠的替代方案,有助于开发新的UCD疗法.
科学领域:
- 生物化学 生化学
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 尿素循环障碍 (UCD) 是一种罕见的代谢缺陷,影响氨的排出,导致严重的神经认知问题.
- 目前对UCD的治疗方法有限,以饮食管理为标准和正体肝移植作为唯一的治愈选择.
- 开发有效的临床前模型对于推进UCD新型治疗策略至关重要.
研究的目的:
- 评估和比较不同的人类细胞模型中的尿素循环的表达和功能.
- 确定适合于尿素循环障碍的临床前研究的细胞模型.
- 评估HepaRG细胞,iPSC-Heps和HepG2细胞作为原发性人肝细胞的替代品的适用性.
主要方法:
- 免疫洗和免疫细胞化学被用来评估尿素循环酶表达.
- 尿素循环代谢物质的稳定同位素追踪评估了途径功能.
- 尿素循环酶表达和功能在肝瘤衍生细胞系,iPSC-Heps和原发性人类肝细胞之间进行比较.
主要成果:
- 差异化HepaRG细胞表现出尿素循环的熟练性,其功能与人类原发性肝细胞类似.
- 与iPSC-Heps.com相比,HepaRG细胞显示出更一致的肝成熟度和酶表达.
- 发现HepG2细胞缺乏关键的尿素循环酶 (甲基因转糖酶,酶1) 和转运器ORNT1,这限制了它们对UCD研究的有用性.
结论:
- 肝素RG细胞代表了一个强大可靠的细胞模型,用于研究尿素循环障碍.
- 这些发现支持使用HepaRG细胞作为一种有价值的替代品,用于UCD研究中初级人类肝细胞.
- 由于缺乏关键的尿素循环成分,HepG2细胞不适合模拟UCD.
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