Ultra-Short Peptide Hydrogels as 3D Bioprinting Materials

Area of Science:

• Biomaterials Science
• Biotechnology
• Nanotechnology

Background:

• Ultra-short peptides (USPs), defined as peptides with ≤7-8 amino acids, are emerging as fundamental self-assembling units for creating hydrogel-based biomaterials.
• Their inherent biocompatibility, simplified synthesis, and tunable nature position them as promising candidates for bioprinting applications.

Purpose of the Study:

• To provide a comprehensive overview of the properties and applications of USPs in three-dimensional (3D) bioprinting.
• To discuss the factors influencing USP self-assembly and their resulting material properties.
• To survey current and emerging applications of USP-based bioinks.

Main Methods:

• Review of existing literature on ultra-short peptides and their use in bioprinting.
• Analysis of peptide sequence, modifications, and environmental factors on self-assembly and rheological properties.
• Survey of applications in tissue engineering, wound healing, drug delivery, biosensing, and imaging.

Main Results:

• USP self-assembly into nanofibers and 3D networks is governed by sequence, modifications, and triggers, yielding shear-thinning, rapidly gelling, and mechanically tunable hydrogels.
• USP-based bioinks support cell viability, differentiation, and matrix deposition in printed constructs for tissue engineering and organotypic models.
• Hybrid and multi-material formulations enhance bioactivity and structural properties, expanding application scope.

Conclusions:

• Challenges remain in achieving high print fidelity, controlling variability, and scaling up peptide manufacturing for widespread adoption.
• Future opportunities include AI-assisted design, adaptive bioprinting, and sustainable synthesis to accelerate clinical translation.
• USPs offer significant potential for developing advanced bioinks for diverse biomedical applications.