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Accelerate wound healing by microscale gel array patch encapsulating defined SDF-1α gradient.

Zhen Xu1, Jiayin Wu2, Ping Gong3

  • 1School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen 518060, China; Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Shenzhen University, Shenzhen 518060, China; Guangdong Key Laboratory of Nanomedicine, Shenzhen Engineering Laboratory of Nanomedicine and Nanoformulations, CAS-HK Joint Lab for Biomaterials, Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Key Laboratory for Molecular Imaging, CAS Key Lab for Health Informatics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|April 23, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel patch that creates sustained signaling molecule gradients to attract stem cells, significantly accelerating skin wound healing and improving tissue regeneration in animal models.

Keywords:
Concentration gradientMicroscale gelSDF-1αTissue engineeringWound healing

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Endogenous stem cell recruitment is crucial for skin injury repair.
  • Existing methods struggle to replicate natural stem cell signaling gradients.
  • Developing biomaterials that mimic physiological gradients is essential for effective wound healing therapies.

Purpose of the Study:

  • To develop a system for generating persistent, localized signaling molecule concentration gradients.
  • To evaluate the efficacy of this system in recruiting bone mesenchymal stem cells (BMSCs) and promoting wound healing.
  • To create a practical, patch-based delivery system for in vivo application.

Main Methods:

  • Chemical conjugation to establish signaling molecule gradients within microscale gel arrays.
  • Culturing and observing BMSC migration towards stromal cell-derived factor-1 alpha (SDF-1α) gradients in vitro.
  • Formulating a patch by integrating the microscale gel array with an adhesive layer.
  • Testing the patch in murine full-thickness skin defect and diabetic animal models.

Main Results:

  • The microscale gel arrays successfully generated stable SDF-1α gradients for over 12 days.
  • BMSCs demonstrated directed migration towards the SDF-1α gradient in vitro.
  • The SDF-1α gradient microscale gel array patch significantly enhanced BMSC recruitment, accelerated wound closure, and promoted neovascularization in vivo.
  • Histological analysis confirmed improved regeneration and similarity to normal skin tissue.
  • Efficacy was demonstrated in both standard and diabetic wound models.

Conclusions:

  • The developed microscale gel array system effectively creates localized SDF-1α gradients, offering an innovative strategy for enhancing endogenous stem cell recruitment.
  • The patch format facilitates convenient, on-demand application for wound healing.
  • This approach holds significant potential for advancing regenerative therapies for skin injuries.