A tough and self-healing poly(l-glutamic acid)-based composite hydrogel for tissue engineering
Weijun Zhang1, Kunxi Zhang, Shifeng Yan
1Department of Polymer Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, P. R. China. zhangkunxi@shu.edu.cn jbyin@oa.shu.edu.cn.
Journal of Materials Chemistry. B
|April 8, 2020
Summary
Researchers developed a tough, self-healing poly(l-glutamic acid) (PLGA) composite hydrogel for tissue repair. This biomaterial shows promise for load-bearing tissue regeneration due to its mechanical strength and ability to heal.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Load-bearing tissue repair requires materials with mechanical strength and self-healing capabilities.
- Dynamic microenvironments pose challenges for traditional tissue repair strategies.
- Poly(l-glutamic acid) (PLGA) offers a versatile platform for developing advanced biomaterials.
Purpose of the Study:
- To fabricate and characterize a novel PLGA-based composite hydrogel with enhanced mechanical properties and self-healing ability.
- To evaluate the suitability of this composite hydrogel for load-bearing tissue repair applications.
- To assess the cytocompatibility and in-situ self-healing capacity of the composite hydrogel with encapsulated cells.
Main Methods:
- Fabrication of a tough porous hydrogel skeleton using laser ablation and hydrophobic assembly.
- Synthesis of a self-healing hydrogel via Schiff base reaction.
- Composite formation by interpenetrating the soft self-healing hydrogel into the porous skeleton.
- Mechanical testing (compressive stress, strain, cyclic compression) and self-healing efficiency evaluation.
- Cell viability assessment using live/dead staining.
Main Results:
- The PLGA-based porous hydrogel skeleton exhibited high porosity (85%) and good toughness (0.51 MPa compressive stress at 80% strain).
- The composite hydrogel demonstrated enhanced mechanical strength (0.21 MPa at 63% strain, 1.3-fold increase) and efficient self-healing (81% healing in 6 hours).
- High cell viability (89% after 7 days) and in-situ self-healing capability were observed with encapsulated cells.
Conclusions:
- The developed PLGA-based composite hydrogel possesses superior mechanical properties and self-healing efficiency.
- The biomaterial demonstrates excellent cytocompatibility and potential for in-situ repair.
- This composite hydrogel is a promising candidate for regenerating load-bearing tissues in dynamic environments.
