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Using Multilayered Hydrogel Bioink in Three-Dimensional Bioprinting for Homogeneous Cell Distribution
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Rheological, Structural, and Biological Trade-Offs in Bioink Design for 3D Bioprinting.

Jeevithan Elango1,2, Camilo Zamora-Ledezma3

  • 1Department of Biomaterials Engineering, Faculty of Health Sciences, UCAM-Universidad Católica San Antonio de Murcia, Campus de los Jerónimos 135, 30107 Murcia, Spain.

Gels (Basel, Switzerland)
|August 28, 2025
PubMed
Summary

Bioinks are crucial for 3D bioprinting functional tissues, but balancing printability and cell function remains a key challenge. Future research aims to overcome these limitations for regenerative medicine applications.

Keywords:
3D bioprinting hydrogelsbiological functionalitycell-laden bioinksmesenchymal stem cellsrheologytissue engineeringviscoelasticity

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Bioinks are essential for 3D bioprinting, enabling the creation of cell-laden constructs that mimic native tissue architecture.
  • Their function extends beyond structural support to sustaining cell viability, proliferation, and differentiation for regenerative medicine.
  • Current bioinks face challenges in balancing printability (rheology) with biological functionality, hindering clinical translation.

Purpose of the Study:

  • To explore the inherent trade-off in bioink research between rheological properties for printability and biological performance.
  • To identify challenges in bioink characterization, production scaling, and long-term biomimetic performance.
  • To offer insights for designing next-generation bioinks for advanced functional tissue engineering.

Main Methods:

  • This review synthesizes current research on bioink development and characterization.
  • It analyzes the critical interplay between rheological properties and biological outcomes.
  • The review discusses challenges and future directions in optimizing bioinks for tissue engineering.

Main Results:

  • A persistent challenge exists in reconciling the conflicting demands of rheological properties for printability and biological functionality.
  • Limitations in bioink characterization, production scaling, and long-term performance hinder clinical translation.
  • The trade-off impacts the fabrication of complex tissues, especially vascularized or mechanically dynamic organs.

Conclusions:

  • Optimizing bioinks requires addressing the rheology-printability versus cell-viability-functionality trade-off.
  • Standardization, scalable production, and long-term performance are critical for clinical success.
  • Designing next-generation bioinks necessitates a holistic approach balancing material properties with biological requirements for functional tissue engineering.