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Direct writing alginate bioink inside pre-polymers of hydrogels to create patterned vascular networks

  • Materials for life sciences
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Abstract

We describe a strategy to fabricate a hydrogel-based microvascular construct by direct writing alginate bioink inside the viscous pre-polymer of hydrogels, which acts as a support bath. As the print needle translates through the polymers, the extruded alginate instantaneously forms calcium alginate hydrogel (Ca-Alg) templates deposited within the bath. This phase change allows the formed templates to be anchored within the pre-polymers, while maintaining their structure. After the printing process, the pre-polymers are solidified to form a mechanically robust hydrogel. Finally, a hydrogel construct with embedded microchannels is generated by liquefying and removing the Ca-Alg templates. Using this method, not only the alginate ink alone can be directly printed within the engineered constructs, but also the size and shape of the formed microchannels are controllable. Furthermore, a confluent endothelial layer for the generation of vascular networks can be constructed by adhering and proliferating endothelial cells on the channel linings. This strategy demonstrates a promising technique for rapid construction of in vitro vasculatures, which would provide a versatile platform for a wide array of applications such as tissue engineering, organ-on-a-chip and drug screening.

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Acknowledgements

This work was supported by the Chinese Government Scholarship (No. 201508140048), National Natural Science Foundation of China (31300808), and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (201417 and 201626).

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Authors and Affiliations

  1. School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan, 030000, China

    Yongkang Wang, Xiaobo Huang, Yi Shen, Ruiqiang Hang, Xiangyu Zhang, Yueyue Wang, Xiaohong Yao & Bin Tang

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  1. Yongkang Wang
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  2. Xiaobo Huang
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  3. Yi Shen
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  4. Ruiqiang Hang
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Correspondence to Xiaobo Huang.

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Wang, Y., Huang, X., Shen, Y. et al. Direct writing alginate bioink inside pre-polymers of hydrogels to create patterned vascular networks. J Mater Sci 54, 7883–7892 (2019). https://doi.org/10.1007/s10853-019-03447-2

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  • DOI: https://doi.org/10.1007/s10853-019-03447-2

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