Three-Dimensional Bioprinting of Anatomically Realistic Tissue Constructs for Disease Modeling and Drug Testing

Area of Science:

• Bioprinting and Tissue Engineering
• Biomaterials Science
• Regenerative Medicine

Background:

• Three-dimensional (3D) bioprinting is a rapidly advancing field with significant potential in tissue engineering and the development of in vitro models.
• Current limitations in bioprinting include the difficulty of replicating fine internal anatomical structures, vascularization, and innervation, hindering the creation of fully functional living tissues.
• The need for anatomically realistic models is critical for applications ranging from tissue implantation to disease mechanism studies and high-throughput drug screening, aiming to reduce animal experimentation.

Purpose of the Study:

• To identify and address conceptual and practical barriers in achieving greater anatomical realism in 3D bioprinted constructs.
• To propose novel workflows that integrate existing bioprinting methods to improve the representation of tissue microarchitecture.
• To enhance the utility of bioprinting for applications in tissue engineering, disease modeling, and toxicology.

Main Methods:

• Development of two distinct workflows for 3D bioprinting:
• Workflow 1: Bioprinting guided by 3D reconstructions of histological sections to incorporate detailed anatomical information.
• Workflow 2: Bioprinting of 2D vascular patterns within stacked cellular layers to mimic native tissue vascularization.

Main Results:

• The proposed workflows offer practical strategies to import anatomically realistic structural information into bioprinted constructs.
• Extrusion bioprinting is presented as a viable, simple, practical, and affordable method for implementing these advanced structural designs.
• The integration of histological data and vascular patterning can significantly improve the fidelity of bioprinted tissue models.

Conclusions:

• Addressing the paucity of anatomic structural details is crucial for realizing the full potential of 3D bioprinting.
• The suggested workflows, leveraging image data and vascular network design, can be implemented with existing bioprinting technology.
• Widespread adoption of these approaches can lead to more sophisticated and applicable bioprinted constructs for research and therapeutic development.