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3D生物打印生长因子的时空定义模式以严格控制组织再生。

3D bioprinting spatiotemporally defined patterns of growth factors to tightly control tissue regeneration.

作者信息

Freeman Fiona E, Pitacco Pierluca, van Dommelen Lieke H A, Nulty Jessica, Browe David C, Shin Jung-Youn, Alsberg Eben, Kelly Daniel J

机构信息

Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Ireland.

Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Ireland.

出版信息

Sci Adv. 2020 Aug 14;6(33):eabb5093. doi: 10.1126/sciadv.abb5093. eCollection 2020 Aug.

Abstract

Therapeutic growth factor delivery typically requires supraphysiological dosages, which can cause undesirable off-target effects. The aim of this study was to 3D bioprint implants containing spatiotemporally defined patterns of growth factors optimized for coupled angiogenesis and osteogenesis. Using nanoparticle functionalized bioinks, it was possible to print implants with distinct growth factor patterns and release profiles spanning from days to weeks. The extent of angiogenesis in vivo depended on the spatial presentation of vascular endothelial growth factor (VEGF). Higher levels of vessel invasion were observed in implants containing a spatial gradient of VEGF compared to those homogenously loaded with the same total amount of protein. Printed implants containing a gradient of VEGF, coupled with spatially defined BMP-2 localization and release kinetics, accelerated large bone defect healing with little heterotopic bone formation. This demonstrates the potential of growth factor printing, a putative point of care therapy, for tightly controlled tissue regeneration.

摘要

治疗性生长因子递送通常需要超生理剂量,这可能会导致不良的脱靶效应。本研究的目的是3D生物打印植入物,其中含有为耦合血管生成和成骨而优化的生长因子的时空定义模式。使用纳米颗粒功能化生物墨水,可以打印出具有不同生长因子模式和从数天到数周释放曲线的植入物。体内血管生成的程度取决于血管内皮生长因子(VEGF)的空间呈现。与均匀负载相同总量蛋白质的植入物相比,在含有VEGF空间梯度的植入物中观察到更高水平的血管侵入。含有VEGF梯度的打印植入物,结合空间定义的BMP-2定位和释放动力学,加速了大骨缺损的愈合,异位骨形成很少。这证明了生长因子打印作为一种假定的即时护理疗法在严格控制组织再生方面的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/376e/7428335/3401e4fe4813/abb5093-F1.jpg

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