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SDF-1 Functionalized Hydrogel Microcarriers for Skin Flap Repair
Xiaochuan Liu1, Jinsi Wang1, Xiaoqin Xu1
1Key Laboratory of 3D Printing Technology in Stomatology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523710, P.R. China.
ACS Biomaterials Science & Engineering
|July 28, 2022
Summary
This study developed a novel microcarrier delivering stromal cell-derived factor 1 (SDF-1) to improve skin flap survival. The Matrigel-coated microcarriers promoted sustained drug release and enhanced blood vessel formation, reducing flap necrosis.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Skin flap necrosis is a major complication of treating skin defects, often caused by poor blood supply and limited angiogenesis.
- Current growth factor delivery methods face challenges with rapid clearance, hindering sustained therapeutic effects for tissue repair.
- Developing sustained-release systems is crucial for effectively promoting angiogenesis and improving skin flap survival.
Purpose of the Study:
- To engineer a novel stromal cell-derived factor 1 (SDF-1) loaded microcarrier coated with Matrigel (MC@SDF-1@Mat) for enhanced skin flap repair.
- To investigate the sustained release properties of the Matrigel-coated microcarriers.
- To evaluate the efficacy of MC@SDF-1@Mat in promoting angiogenesis and improving skin flap survival in a murine model.
Main Methods:
- Fabrication of SDF-1 loaded microcarriers coated with Matrigel, characterized by SEM.
- Assessment of sustained drug release using methylene blue as a model drug.
- In vitro evaluation of endothelial cell proliferation, migration, and tube formation (HUVECs).
- In vivo assessment using a murine random skin flap model, including histological analysis (H&E, Masson) and CD31 immunohistochemistry.
Main Results:
- SEM confirmed a porous Matrigel coating on the microcarriers.
- Matrigel coating significantly enhanced the sustained release of the model drug compared to uncoated microcarriers.
- MC@SDF-1@Mat demonstrated significant promotion of HUVEC proliferation, migration, and angiogenesis in vitro.
- In vivo studies showed a reduced necrosis area, improved histological structure, collagen organization, and increased neovascularization in the MC@SDF-1@Mat treated group.
Conclusions:
- The developed SDF-1 functionalized gelatin-based hydrogel microcarrier (MC@SDF-1@Mat) effectively promotes sustained release of bioactive factors.
- MC@SDF-1@Mat significantly enhances angiogenesis and improves skin flap survival by promoting cell proliferation and migration.
- This novel microcarrier system shows considerable potential for clinical applications in skin flap repair and localized drug delivery.
