INSERM, Bioingénierie Tissulaire, U1026, F-33076, Bordeaux, France.
CHU de Bordeaux, Services d'Odontologie et de Santé Buccale, F-33076, Bordeaux, France.
Sci Rep. 2018 Oct 25;8(1):15777. doi: 10.1038/s41598-018-34226-9.
Recent advances in the field of Tissue Engineering allowed to control the three-dimensional organization of engineered constructs. Cell pattern imaging and in vivo follow-up remain a major hurdle in in situ bioprinting onto deep tissues. Magnetic Resonance Imaging (MRI) associated with Micron-sized superParamagnetic Iron Oxide (MPIO) particles constitutes a non-invasive method for tracking cells in vivo. To date, no studies have utilized Cellular MRI as a tool to follow cell patterns obtained via bioprinting technologies. Laser-Assisted Bioprinting (LAB) has been increasingly recognized as a new and exciting addition to the bioprinting's arsenal, due to its rapidity, precision and ability to print viable cells. This non-contact technology has been successfully used in recent in vivo applications. The aim of this study was to assess the methodology of tracking MPIO-labeled stem cells using MRI after organizing them by Laser-Assisted Bioprinting. Optimal MPIO concentrations for tracking bioprinted cells were determined. Accuracy of printed patterns was compared using MRI and confocal microscopy. Cell densities within the patterns and MRI signals were correlated. MRI enabled to detect cell patterns after in situ bioprinting onto a mouse calvarial defect. Results demonstrate that MRI combined with MPIO cell labeling is a valuable technique to track bioprinted cells in vitro and in animal models.
组织工程领域的最新进展使得能够控制工程化构建体的三维组织。细胞图案成像和体内后续仍然是原位生物打印到深部组织的主要障碍。磁共振成像 (MRI) 与微米级超顺磁氧化铁 (MPIO) 颗粒结合构成了一种用于体内跟踪细胞的非侵入性方法。迄今为止,尚无研究利用细胞 MRI 作为通过生物打印技术获得的细胞图案的跟踪工具。激光辅助生物打印 (LAB) 由于其快速性、精确性和打印活细胞的能力,已越来越被认为是生物打印领域的一项新的令人兴奋的补充技术。这项非接触技术已成功应用于最近的体内应用。本研究旨在评估通过激光辅助生物打印对细胞进行组织后,使用 MRI 跟踪 MPIO 标记干细胞的方法。确定了用于跟踪生物打印细胞的最佳 MPIO 浓度。使用 MRI 和共聚焦显微镜比较了打印图案的准确性。细胞密度与图案内的 MRI 信号相关。MRI 能够在原位生物打印到小鼠颅骨缺损后检测到细胞图案。结果表明,将 MRI 与 MPIO 细胞标记相结合是一种在体外和动物模型中跟踪生物打印细胞的有价值的技术。
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