Towards Vascularized Tissue Blocks Using a Suspension Bioprinted Blood Vessel

Vasileios D. Trikalitis, Fabian Stein, Julia Perea Paizal, Nasim Salehi-Nik, Jeroen Rouwkema

    Research output: Contribution to conferencePoster

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    Abstract

    In order for engineered tissue grafts and eventually organs to successfully integrate in a clinical setting, a functional vascular network is imperative. Without vasculature, the tissue constructs cannot receive nutrients essential for their survival, but also lack the stimuli that determine the tissue’s biophysical properties i.e. cell fate determination, cell to cell junctions, and cell orientation. In order for the vascular network to functionally connect to the patient, a hierarchical organization, resembling the vascular tree, is important. From previous studies it is known that fluid flow is a crucial component in controlling the formation of the vascular tree, and that the organization of the vascular network can be further controlled using gradients of angiogenic growth factors such as VEGF.
    By utilizing spheroid bioprinting within a microgel suspension, an artificial vessel structure was assembled. The deposited spheroids maintained viability and fused over time into perfusable vessels.The subsequent formation of small-diameter vascular structures and capillaries was regulated by an on-demand flow through the bioprinted vessel, resulting in controllable fluid flow shear stresses. Furthermore, VEGF was spatially patterned in the tissue block by locally doping the suspension with growth factor releasing microparticles. By varying both these stimuli, the location of vascular sprout formation and subsequent growth of the new vascular structures could be influenced.
    This spheroid 3D bioprinting platform offers a dynamic, customizable and accurate method to trigger and control the process of angiogenesis in vitro. By stimulating an artificial blood vessel with controlled fluid flow and growth factor gradients, a vascular complex vascular network can be produced and modulated. The combination of this approach with a gradual replacement of the microgel suspension with cells, can pave the way for the production of vascularized tissue blocks.
    Original languageEnglish
    Publication statusPublished - 6 Sep 2018
    Event5th TERMIS World Congress 2018: Integration of Industry, Government, and Academia for Regenerative Medicine - Kyoto International Conference Center , Kyoto, Japan
    Duration: 4 Sep 20187 Sep 2018
    Conference number: 5
    https://www.termis.org/wc2018/

    Conference

    Conference5th TERMIS World Congress 2018
    Abbreviated titleTERMIS-WC
    CountryJapan
    CityKyoto
    Period4/09/187/09/18
    Internet address

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  • Cite this

    Trikalitis, V. D., Stein, F., Perea Paizal, J., Salehi-Nik, N., & Rouwkema, J. (2018). Towards Vascularized Tissue Blocks Using a Suspension Bioprinted Blood Vessel. Poster session presented at 5th TERMIS World Congress 2018, Kyoto, Japan.