【AI详解】Designer matrices for intestinal stem cell and organoid culture.

文献信息

一句话小结

本研究利用模块化合成水凝胶网络揭示了不同机械环境和细胞外基质（ECM）成分对肠道干细胞（ISC）扩展和类器官形成的关键影响，发现高基质刚度促进ISC扩展，而柔软基质则有利于其分化和类器官生成。该工作提供了一种完全定义的培养系统，克服了当前类器官培养的局限性，显著提升了其在基础和临床研究中的应用潜力。

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肠道干细胞 · 类器官 · 细胞外基质 · 合成水凝胶 · 机械环境

摘要

上皮类器官重现了真实器官的多个方面，使其成为器官发育、功能和疾病研究的有前途的模型。然而，由于其生长所依赖的动物源基质定义不明确，类器官在研究和治疗中的潜力仍未得到充分发挥。在此，我们使用模块化合成水凝胶网络来定义影响肠道干细胞（ISC）扩展和类器官形成的关键细胞外基质（ECM）参数，并表明该过程的不同阶段需要不同的机械环境和ECM成分。特别是，基于纤维连接蛋白的粘附对于ISC的存活和增殖是足够的。高基质刚度通过依赖于YAP（是相关蛋白1）的机制显著增强了ISC的扩展。另一方面，ISC的分化和类器官的形成则需要柔软的基质和基于层粘连蛋白的粘附。我们利用这些见解构建了一个完全定义的培养系统，以扩展小鼠和人类ISC。我们还制作了机械动态基质，最初对ISC扩展是最佳的，随后又允许分化和肠道类器官的形成，从而为小鼠和人类干细胞衍生类器官的培养提供了明确的动物源基质替代方案。我们的方法克服了当前类器官培养的多重局限性，并大大扩展了其在基础和临床研究中的适用性。这里提出的原则可以扩展到识别最适合其他类型干细胞和类器官长期培养的设计基质。

英文摘要

Epithelial organoids recapitulate multiple aspects of real organs, making them promising models of organ development, function and disease. However, the full potential of organoids in research and therapy has remained unrealized, owing to the poorly defined animal-derived matrices in which they are grown. Here we used modular synthetic hydrogel networks to define the key extracellular matrix (ECM) parameters that govern intestinal stem cell (ISC) expansion and organoid formation, and show that separate stages of the process require different mechanical environments and ECM components. In particular, fibronectin-based adhesion was sufficient for ISC survival and proliferation. High matrix stiffness significantly enhanced ISC expansion through a yes-associated protein 1 (YAP)-dependent mechanism. ISC differentiation and organoid formation, on the other hand, required a soft matrix and laminin-based adhesion. We used these insights to build a fully defined culture system for the expansion of mouse and human ISCs. We also produced mechanically dynamic matrices that were initially optimal for ISC expansion and subsequently permissive to differentiation and intestinal organoid formation, thus creating well-defined alternatives to animal-derived matrices for the culture of mouse and human stem-cell-derived organoids. Our approach overcomes multiple limitations of current organoid cultures and greatly expands their applicability in basic and clinical research. The principles presented here can be extended to identify designer matrices that are optimal for long-term culture of other types of stem cells and organoids.

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主要研究问题

1. 在设计肠道干细胞和类器官培养的合成水凝胶网络时，如何选择合适的机械环境和ECM成分？
2. 能否探讨不同的基质刚度对肠道干细胞扩展和分化的具体影响？
3. 在临床研究中，如何评估这些合成基质的有效性与动物来源基质的比较？
4. 除了肠道干细胞，是否有其他类型的干细胞可以利用类似的设计矩阵进行培养？
5. 如何利用这些研究成果推动类器官在疾病模型中的应用，特别是在药物筛选和治疗策略方面？

核心洞察

1. 研究背景和目的

器官类器官（organoids）是模拟真实器官多种特性的模型，具有重要的研究和治疗潜力。然而，当前器官类器官的培养多依赖于动物来源的基质，这些基质性质不明确，限制了器官类器官在基础研究和临床应用中的潜力。本研究的目的是利用模块化合成水凝胶网络，明确影响肠道干细胞（ISC）扩展和类器官形成的关键细胞外基质（ECM）参数，从而建立一种完全定义的培养系统，以便更好地支持小鼠和人类的肠道干细胞培养。

2. 主要方法和发现

研究者利用合成水凝胶网络设计了不同的基质，以研究不同机械环境和ECM成分对肠道干细胞的影响。研究结果表明，肠道干细胞的生存和增殖需要以纤维连接蛋白为基础的粘附，而高基质刚度则显著增强ISC的扩展，这一过程依赖于YAP（yes-associated protein）机制。相对而言，ISC的分化及类器官的形成则需要较软的基质和以层粘连蛋白为基础的粘附。研究进一步开发了可机械动态调整的基质，初期适合于肠道干细胞的扩展，后期则有利于分化和类器官形成。

3. 核心结论

本研究建立了一种完全定义的培养系统，能够有效支持小鼠和人类肠道干细胞的扩展和分化，克服了当前类器官培养中存在的多个限制。通过优化ECM参数和机械环境，该系统不仅提升了类器官的培养效率，还扩展了其在基础和临床研究中的适用性。

4. 研究意义和影响

本研究为肠道干细胞及类器官的培养提供了新的思路和方法，可能会在再生医学、疾病模型和药物筛选等领域产生深远影响。通过提供无动物来源的基质，研究不仅提升了实验的可重复性和可控性，还为其他类型的干细胞和类器官的长时间培养奠定了基础，促进了细胞生物学和组织工程的进一步发展。

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引用本文的文献

1. Hacking the Matrix. - Michael Czerwinski;Jason R Spence - Cell stem cell (2017)
2. The Hippo pathway in tissue homeostasis and regeneration. - Yu Wang;Aijuan Yu;Fa-Xing Yu - Protein & cell (2017)
3. Converging biofabrication and organoid technologies: the next frontier in hepatic and intestinal tissue engineering? - Kerstin Schneeberger;Bart Spee;Pedro Costa;Norman Sachs;Hans Clevers;Jos Malda - Biofabrication (2017)
4. Culturing human intestinal stem cells for regenerative applications in the treatment of inflammatory bowel disease. - Fredrik Eo Holmberg;Jakob B Seidelin;Xiaolei Yin;Benjamin E Mead;Zhixiang Tong;Yuan Li;Jeffrey M Karp;Ole H Nielsen - EMBO molecular medicine (2017)
5. Embryoids, organoids and gastruloids: new approaches to understanding embryogenesis. - Mijo Simunovic;Ali H Brivanlou - Development (Cambridge, England) (2017)
6. Dissecting the stem cell niche with organoid models: an engineering-based approach. - Lyndsay M Murrow;Robert J Weber;Zev J Gartner - Development (Cambridge, England) (2017)
7. Generating tissue topology through remodeling of cell-cell adhesions. - Katharine Goodwin;Celeste M Nelson - Experimental cell research (2017)
8. Multi-compartment encapsulation of communicating droplets and droplet networks in hydrogel as a model for artificial cells. - Mariam Bayoumi;Hagan Bayley;Giovanni Maglia;K Tanuj Sapra - Scientific reports (2017)
9. Molecular Mechanisms of Stem/Progenitor Cell Maintenance in the Adrenal Cortex. - Antonio Marcondes Lerario;Isabella Finco;Christopher LaPensee;Gary Douglas Hammer - Frontiers in endocrinology (2017)
10. Stem cell-derived organoids and their application for medical research and patient treatment. - Sina Bartfeld;Hans Clevers - Journal of molecular medicine (Berlin, Germany) (2017)

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