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Published on: May 25, 2012
A Hierarchical Hydrogel Modulates Immune-Mechanical Microenvironments to Spatiotemporally Reprogram Fibroblasts for
Shuangli Zhu1,2, Qiuyue Ma1,2, Ayang Zhao1
1School of Medicine and Health, MOE Key Laboratory of Micro-systems and Micro-structures Manufacturing, Harbin Institute of Technology, Harbin, China.
Advanced Healthcare Materials
|August 9, 2026
Summary
This study developed a smart hydrogel that controls fibroblast behavior to prevent scar tissue formation during wound healing. The advanced biomaterial promotes rapid, scar-free healing by releasing therapeutic agents in response to specific wound conditions.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Wound Healing Research
Background:
- Fibrosis presents a significant hurdle in wound repair, stemming from the complex roles of fibroblasts in both healing and scar deposition.
- The temporal regulation of fibroblast activation is critical for effective wound healing, posing a challenge for advanced biomaterial design.
Purpose of the Study:
- To engineer a hierarchical hydrogel capable of spatiotemporally regulating fibroblast behavior for fibrosis suppression without impeding wound healing.
- To develop a biomaterial that addresses the dual role of fibroblasts in wound repair and fibrotic scarring.
Main Methods:
- Fabrication of a thermo-responsive hydrogel (CC-pMnO2-Vet@PNAA) using dynamic boronate ester linkages between modified chitosan and microgels.
- Hierarchical encapsulation enabling stage-specific release of polydopamine-modified MnO2 (pMnO2) and verteporfin nanoparticles (Vet NPs).
- In vivo evaluation in a diabetic rat model to assess wound healing efficacy and fibrosis suppression.
Main Results:
- The hydrogel demonstrated rapid disassembly in the inflammatory phase, releasing pMnO2 and chitosan-caffeic acid (CS-CA) to combat bacteria, oxidative stress, and restore immune balance.
- Near-infrared (NIR) irradiation triggered on-demand release of Vet NPs in the remodeling phase, suppressing YAP signaling and rebalancing the mechanical microenvironment.
- CC-pMnO2-Vet@PNAA facilitated coordinated immune-mechanical regulation, leading to accelerated and scar-free wound healing in vivo.
Conclusions:
- The engineered hierarchical hydrogel effectively manages fibroblast activity, mitigating fibrosis while promoting efficient wound closure.
- This biomaterial offers a promising strategy for advanced wound repair by precisely controlling the healing microenvironment.
