在细胞疗法中限制细胞增殖的thymidylate合成酶干扰
Rocio Sartori-Maldonado1, Hossam Montaser1, Inkeri Soppa1
1Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, 00290 Helsinki, Finland.
概括
科学家们通过使TYMS酶失活来开发了一种用于干细胞的新型安全系统. 这些修改后的细胞只能与提米丁一起繁殖,使得可控的细胞制造能够在没有遗传改变的情况下用于再生医学.
科学领域:
- 细胞生物学 细胞生物学
- 再生医学是一种再生医学.
- 生物技术是生物技术.
背景情况:
- 干细胞和祖细胞对于再生医学和基因治疗至关重要.
- 细胞移植带有不受控制的增殖风险,特别是在基因改造后.
- 需要安全系统来控制细胞生长,而不会影响治疗潜力.
研究的目的:
- 开发一种非遗传安全系统来控制干细胞的增殖.
- 评估TYMS酶失活对细胞制造和分化的影响.
- 评估蒂米丁依赖干细胞的治疗潜力.
主要方法:
- 在各种细胞系中,提米酸合成酶 (TYMS) 基因的失活.
- 培养TYMS缺乏细胞,并没有外源性胆胺补充剂.
- 评估细胞增殖,瘤形成和分化能力 (例如,变成胰腺β细胞).
- 在体外和体内评估分化细胞的功能.
主要成果:
- 由于TYMS的失活,细胞因增殖而依赖外源性蒂米丁.
- 缺乏TYMS的多能干细胞在提米丁补充剂下增殖,形成瘤,并有效地分化.
- 转移后分化的细胞不需要提米丁来发挥作用,无论是体外还是体外.
- 功能性人类胰岛素在小鼠中从移植的干细胞衍生的胰腺组织中产生,长达5个月.
结论:
- TYMS无活化为干细胞制造提供了一个强大的非遗传安全机制.
- 提米丁依赖性允许干细胞的受控增殖和分化,用于再生应用.
- 该系统通过防止移植后不必要的生长,提高了基于细胞的疗法的安全性.
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