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用于转化生物医学研究的牛原代肠类器官衍生的二维单层培养系统的建立。

Generation of a Bovine Primary Enteroid-Derived Two-Dimensional Monolayer Culture System for Applications in Translational Biomedical Research.

机构信息

Department of Farm Animal Medicine, College of Veterinary Medicine, Midwestern University.

Department of Farm Animal Medicine, College of Veterinary Medicine, Midwestern University;

出版信息

J Vis Exp. 2024 Apr 5(206). doi: 10.3791/65901.

Abstract

Organoid cell culture systems can recapitulate the complexity observed in tissues, making them useful in studying host-pathogen interactions, evaluating drug efficacy and toxicity, and tissue bioengineering. However, applying these models for the described reasons may be limited because of the three-dimensional (3D) nature of these models. For example, using 3D enteroid culture systems to study digestive diseases is challenging due to the inaccessibility of the intestinal lumen and its secreted substances. Indeed, stimulation of 3D organoids with pathogens requires either luminal microinjection, mechanical disruption of the 3D structure, or generation of apical-out enteroids. Moreover, these organoids cannot be co-cultured with immune and stromal cells, limiting in-depth mechanistic analysis into pathophysiological dynamics. To circumvent this, we optimized a bovine primary cell two-dimensional (2D) enteroid-derived monolayer culture system, allowing co-culture with other relevant cell types. Ileal crypts isolated from healthy adult cattle were cultured to generate 3D organoids that were cryopreserved for future use. A 2D monolayer was created using revived 3D enteroids that were passaged and disrupted to yield single cells, which were seeded on basement membrane extract-coated transwell cell culture inserts, thereby exposing their apical surface. The intestinal monolayer polarity, cellular differentiation, and barrier function were characterized using immunofluorescence microscopy and measuring transepithelial electrical resistance. Stimulation of the apical surface of the monolayer revealed the expected functionality of the monolayer, as demonstrated by cytokine secretion from both apical and basal compartments. The described 2D enteroid-derived monolayer model holds great promise in investigating host-pathogen interactions and intestinal physiology, drug development, and regenerative medicine.

摘要

类器官细胞培养系统可以再现组织中观察到的复杂性,使其在研究宿主-病原体相互作用、评估药物疗效和毒性以及组织工程中非常有用。然而,由于这些模型的三维(3D)性质,应用这些模型可能会受到限制。例如,由于肠腔及其分泌物质无法进入,使用 3D 类肠器培养系统来研究消化系统疾病具有挑战性。实际上,要刺激 3D 类器官与病原体相互作用,需要进行肠腔微注射、破坏 3D 结构或生成顶端向外的类肠器。此外,这些类器官不能与免疫和基质细胞共培养,限制了对病理生理动力学的深入机制分析。为了克服这一问题,我们优化了牛原代细胞二维(2D)类肠器衍生的单层培养系统,允许与其他相关细胞类型共培养。我们从健康成年牛的回肠隐窝中分离出细胞,进行 3D 类器官培养,然后将其冷冻保存,以备将来使用。使用复活的 3D 类肠器创建了 2D 单层,这些类肠器经过传代和破坏以获得单细胞,然后将其接种在基底膜提取物包被的 Transwell 细胞培养插入物上,从而暴露其顶端表面。通过免疫荧光显微镜观察和测量跨上皮电阻来表征肠单层的极性、细胞分化和屏障功能。刺激单层的顶端表面揭示了单层的预期功能,因为从顶端和基底隔室都分泌了细胞因子。所描述的 2D 类肠器衍生的单层模型在研究宿主-病原体相互作用和肠道生理学、药物开发和再生医学方面具有广阔的应用前景。

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