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可编程电沉积法制备具有高分辨率细胞图案化和分隔功能的Janus 海藻酸钠/聚-L-赖氨酸/海藻酸钠(APA)微胶囊。

Programmable Electrodeposition of Janus Alginate/Poly-L-Lysine/Alginate (APA) Microcapsules for High-Resolution Cell Patterning and Compartmentalization.

机构信息

Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.

Stem Cell Therapy and Regenerative Medicine Lab, Tsinghua-Berkeley Shenzhen Institute (TBSI), No.1001 Xueyuan Avenue, Nanshan District, Shenzhen, 518000, China.

出版信息

Small. 2022 Mar;18(10):e2106363. doi: 10.1002/smll.202106363. Epub 2021 Dec 18.

Abstract

Encapsulation of live cells in protective, semipermeable microcapsules is one of the kernel techniques for in vitro tissue regeneration, cell therapies, and pharmaceutical screening. Advanced fabrication techniques for cell encapsulation have been developed to meet different requirements. Existing cell encapsulation techniques place substantial constraints on the spatial patterning of live cells as well as on the compartmentalization of heterotypic cells. Alginate-Poly-L-lysine-alginate (APA) microcapsules that use sodium alginate as the polyanion and poly-L-lysine (PLL) as the polycation have been extensively employed for cell microencapsulation due to their excellent biocompatibility and biodegradability. This study proposes a novel method for developing programmable Janus APA microcapsules with variable shapes and sizes by using electrodeposition. By the versatile design of the microelectrode device, sequential electrodeposition is triggered to electro-address the cells at specific locations immobilized within a Janus APA microcapsule. The osteogenesis is evaluated by resembling cell compartmentalized and vascularized osteoblast-laden constructs. This technique allows precise spatial patterning of heterotypic cells inside the APA microcapsule, enabling the observation of cellular growth, interactions, and differentiation in a well-controlled chemical and mechanical microenvironment.

摘要

将活细胞封装在保护性、半透性的微胶囊中是体外组织再生、细胞治疗和药物筛选的核心技术之一。为满足不同的需求,已经开发出了先进的细胞封装制造技术。现有的细胞封装技术对活细胞的空间模式以及异质细胞的分隔都有很大的限制。由于具有良好的生物相容性和可生物降解性,使用海藻酸钠作为聚阴离子和聚-L-赖氨酸 (PLL) 作为聚阳离子的海藻酸钠-聚-L-赖氨酸-海藻酸钠 (APA) 微胶囊已被广泛用于细胞微封装。本研究提出了一种通过电沉积制备可编程的各向异性 APA 微胶囊的新方法,该微胶囊具有可变的形状和尺寸。通过微电极装置的多功能设计,触发顺序电沉积以在固定在各向异性 APA 微胶囊内的特定位置处的细胞上进行电寻址。通过模拟细胞分隔和血管化的成骨细胞负载构建物来评估成骨作用。该技术允许在 APA 微胶囊内对异质细胞进行精确的空间模式化,使我们能够在可控的化学和机械微环境中观察细胞的生长、相互作用和分化。

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