There is a need to find better strategies to promote wound healing, especially of chronic wounds, which remain a challenge. We found that synovium mesenchymal stem cells (SMSCs) have the ability to strongly promote cell proliferation of fibroblasts; however, they are ineffective at promoting angiogenesis. Using gene overexpression technology, we overexpressed microRNA‐126‐3p (miR‐126‐3p) and transferred the angiogenic ability of endothelial progenitor cells to SMSCs, promoting angiogenesis. We tested a therapeutic strategy involving controlled‐release exosomes derived from miR‐126‐3p‐overexpressing SMSCs combined with chitosan. Our in vitro results showed that exosomes derived from miR‐126‐3p‐overexpressing SMSCs (SMSC‐126‐Exos) stimulated the proliferation of human dermal fibroblasts and human dermal microvascular endothelial cells (HMEC‐1) in a dose‐dependent manner. Furthermore, SMSC‐126‐Exos also promoted migration and tube formation of HMEC‐1. Testing this system in a diabetic rat model, we found that this approach resulted in accelerated re‐epithelialization, activated angiogenesis, and promotion of collagen maturity in vivo. These data provide the first evidence of the potential of SMSC‐126‐Exos in treating cutaneous wounds and indicate that modifying the cells—for example, by gene overexpression—and using the exosomes derived from these modified cells provides a potential drug delivery system and could have infinite possibilities for future therapy. Stem Cells Translational Medicine
2017;6:736–747
Chronic
wounds are one of the most serious complications of diabetes
mellitus. Even though utilizing nitric oxide (NO) as a gas medicine
to repair diabetic wounds presents a promising strategy, controlling
the NO release behavior in the affected area, which is vital for NO-based
therapy, still remains a significant challenge. In this work, a copper-based
metal–organic framework, namely, HKUST-1, has been introduced
as a NO-loading vehicle, and a NO sustained release system with the
core–shell structure has been designed through the electrospinning
method. The results show that the NO is quantificationally and stably
loaded in the HKUST-1 particles, and the NO-loaded HKUST-1 particles
are well incorporated into the core layer of the coaxial nanofiber.
Therefore, NO can be controllably released with an average release
rate of 1.74 nmol L–1 h–1 for
more than 14 days. Moreover, the additional copper ions released from
the degradable HKUST-1 play a synergistic role with NO to promote
endothelial cell growth and significantly improve the angiogenesis,
collagen deposition as well as anti-inflammatory property in the wound
bed, which eventually accelerate the diabetic wound healing. These
results suggest that such a copper-based metal–organic framework
material as a controllable NO-releasing vehicle is a highly efficient
therapy for diabetic wounds.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.