合成生物学 ›› 2024, Vol. 5 ›› Issue (4): 851-866.DOI: 10.12211/2096-8280.2023-104

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血管化类器官的构建方法及生物材料

李石开1,2, 曾东鳌1,2, 杜方舟2, 张京钟1,2, 余爽1,2   

  1. 1.中国科学技术大学,生命科学与医学部,生物医学工程学院(苏州),安徽 合肥 230026
    2.中国科学院苏州生物医学工程技术研究所,江苏 苏州 215163
  • 收稿日期:2023-12-04 修回日期:2024-02-29 出版日期:2024-08-31 发布日期:2024-09-19
  • 通讯作者: 张京钟,余爽
  • 作者简介:李石开(1997—),男,博士研究生。研究方向为干细胞结合生物材料在皮肤功能性重建中的应用。E-mail:lishikai26@163.com
    张京钟(1973—),男,研究员,博士生导师。研究方向为干细胞/类脑器官治疗神经系统重大疾病,类器官芯片互联为微生理系统及其应用开发等。E-mail:zhangjz@sibet.ac.cn
    余爽(1977—),女,研究员,博士生导师。研究方向为干细胞/类器官培养及相关的细胞替代疗法在皮肤功能性重建中的应用,干细胞/外泌体技术在神经精神疾病中的应用及其机制探索等。E-mail:yush@sibet.ac.cn
  • 基金资助:
    国家重点研发计划(2021YFA1101100);国家自然科学基金(82271522);姑苏重大创新团队项目(ZXT2019007)

The construction approaches and biomaterials for vascularized organoids

Shikai LI1,2, Dong′ao ZENG1,2, Fangzhou DU2, Jingzhong ZHANG1,2, Shuang YU1,2   

  1. 1.School of Biomedical Engineering (Suzhou),Division of Life Science and Medicine,University of Science and Technology of China,Hefei 230026,Anhui,China
    2.Suzhou Institute of Biomedical Engineering and Technology,Chinese Academy of Sciences,Suzhou 215163,Jiangsu,China
  • Received:2023-12-04 Revised:2024-02-29 Online:2024-08-31 Published:2024-09-19
  • Contact: Jingzhong ZHANG, Shuang YU

摘要:

类器官血管化是完善类器官结构、功能及支持其体外长期存活的关键问题。近年来,随着类器官培养及生物工程技术的发展,类器官血管化有了长足的进步。本文综述了血管化类器官领域的最新进展,总结了目前用于血管化的构建策略与方法,包括干细胞共分化、多细胞共培养、微血管片段,移植后体内再血管化等生物技术,以及微制造、静电纺丝、三维生物打印、微流控技术等工程技术手段在血管化类器官方面的应用。血管化类器官的构建通常会辅以生物材料来负载血管化相关因子或提供不同类型细胞生长的微环境,本文对构建血管化类器官中应用的天然及合成生物材料也做了相应讨论。虽然类器官血管化目前还存在一定的局限性,但随着对血管化关键机制的解析及生物工程技术的进步,多种构建方法及生物材料的联合应用,将极大促进结构及功能完善的血管化类器官构建,并实质性地推动类器官技术在基础及临床医学领域的应用。

关键词: 干细胞, 类器官, 血管化, 生物工程学方法, 生物材料

Abstract:

The adequate perfusion of blood and exchange of metabolites are crucial for maintaining organoid homeostasis and supporting cell survival, growth, and functionality. Therefore, vascularization of organoids is an essential step towards improving their functionality and long-term survival. This review provides a comprehensive overview of recent advances in the field of organoid vascularization, highlighting various construction approaches and biomaterials used to promote blood vessel formation within organoids. There are various approaches for constructing vascularized organoids, with co-differentiation and co-culture being widely utilized. Co-differentiation enables simultaneous development of both organ-specific and vascular cells from stem cells, while co-culture involves growing stem or progenitor cells together with vascular cells to promote the formation of vascular networks through self-assembly. Transplantation strategies, such as introducing microvascular fragments into organoids or engrafting organoids into specific organs, can also promote the formation of a natural and efficient vascular system within the organoid. Moreover, bioengineering strategies offer promising alternatives for organoid vascularization. Techniques like microarray fabrication and electrospinning enable the creation of micro-surface and biomimetic structures that support vascular network formation. Meanwhile, 3D bioprinting allows for the incorporation of endothelial cells and supporting biomaterials in a spatially controlled manner, facilitating the development of vascular networks within organoids. Microfluidic systems provide precise control over fluid, nutrient, and signaling factors within microscale channels, allowing for the manipulation of vascular networks in a controlled and dynamic environment. The construction of vascularized organoids often involves the utilization of biocompatible materials to incorporate pro-angiogenic factors and to create suitable microenvironments for different cell types. Hence, this review also encompasses the application cases of both natural and synthetic biomaterials in the development of vascularized organoids. Hydrogels are widely utilized in the construction of both organoids and vascularized organoids. They can be categorized into natural hydrogels, such as Matrigel, decellularized matrix, collagen, etc., and synthetic hydrogels like polyethylene glycol. Natural hydrogels are biocompatible and biologically active but with limited mechanical strength, while synthetic hydrogels offer long-term stability and tunable mechanical properties albeit with the potential lack of biocompatibility. Combining the natural and synthetic hydrogels can facilitate the creation of stable and tunable microenvironments for vascularization. Despite significant advancements, challenges in organoid vascularization continue to exist. The complex structure of organ-specific blood vessels and the underlying mechanisms of angiogenesis are still not fully understood. Additionally, accurately replicating of the in vivo microenvironment, the technical complexities of bioengineering methods, and the instability of organoid cultures hamper the generation of functional vascularized organoids. Ongoing research focusing on deciphering the key mechanisms of vascularization, combined with advancements in biotechnology, offers promising prospects for significantly enhancing the structural and functional maturity of vascularized organoids. These advancements are expected to pave the way for the widespread utilization of organoid technology in both basic and clinical fields of medicine.

Key words: stem cells, organoids, vascularization, bioengineering methods, biomaterials

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