Issue 10, 2024

Tissue-specific gelatin bioink as a rheology modifier for high printability and adjustable tissue properties

Abstract

Decellularized extracellular matrix (dECM) has emerged as an exceptional biomaterial that effectively recapitulates the native tissue microenvironment for enhanced regenerative potential. Although various dECM bioinks derived from different tissues have shown promising results, challenges persist in achieving high-resolution printing of flexible tissue constructs because of the inherent limitations of dECM's weak mechanical properties and poor printability. Attempts to enhance mechanical rigidity through chemical modifications, photoinitiators, and nanomaterial reinforcement have often compromised the bioactivity of dECM and mismatched the desired mechanical properties of target tissues. In response, this study proposes a novel method involving a tissue-specific rheological modifier, gelatinized dECM. This modifier autonomously enhances bioink modulus pre-printing, ensuring immediate and precise shape formation upon extrusion. The hybrid bioink with GeldECM undergoes a triple crosslinking system—physical entanglement for pre-printing, visible light photocrosslinking during printing for increased efficiency, and thermal crosslinking post-printing during tissue culture. A meticulous gelatinization process preserves the dECM protein components, and optimal hybrid ratios modify the mechanical properties, tailoring them to specific tissues. The application of this sequential multiple crosslinking designs successfully yielded soft yet resilient tissue constructs capable of withstanding vigorous agitation with high shape fidelity. This innovative method, founded on mechanical modulation by GeldECM, holds promise for the fabrication of flexible tissues with high resilience.

Graphical abstract: Tissue-specific gelatin bioink as a rheology modifier for high printability and adjustable tissue properties

Supplementary files

Article information

Article type
Paper
Submitted
27 Dec 2023
Accepted
17 Mar 2024
First published
19 Mar 2024
This article is Open Access
Creative Commons BY-NC license

Biomater. Sci., 2024,12, 2599-2613

Tissue-specific gelatin bioink as a rheology modifier for high printability and adjustable tissue properties

H. Han, M. Kim, U. Yong, Y. Jo, Y. Choi, H. J. Kim, D. G. Hwang, D. Kang and J. Jang, Biomater. Sci., 2024, 12, 2599 DOI: 10.1039/D3BM02111D

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