Diabetic
wound healing is one of the major challenges in the biomedical
fields. The conventional single drug treatments have unsatisfactory
efficacy, and the drug delivery effectiveness is restricted by the
penetration depth. Herein, we develop a magnesium organic framework-based
microneedle patch (denoted as MN-MOF-GO-Ag) that can realize transdermal
delivery and combination therapy for diabetic wound healing. Multifunctional
magnesium organic frameworks (Mg-MOFs) are mixed with poly(γ-glutamic
acid) (γ-PGA) hydrogel and loaded into the tips of MN-MOF-GO-Ag,
which slowly releases Mg2+ and gallic acid in the deep
layer of the dermis. The released Mg2+ induces cell migration
and endothelial tubulogenesis, while gallic acid, a reactive oxygen
species-scavenger, promotes antioxidation. Besides, the backing layer
of MN-MOF-GO-Ag is made of γ-PGA hydrogel and graphene oxide-silver
nanocomposites (GO-Ag) which further enables excellent antibacterial
effects for accelerating wound healing. The therapeutic effects of
MN-MOF-GO-Ag on wound healing are demonstrated with the full-thickness
cutaneous wounds of a diabetic mouse model. The significant improvement
of wound healing is achieved for mice treated with MN-MOF-GO-Ag.
Diabetic wounds are one complication of persistent hyperglycemia and lead to neuropathy and vascular lesions in patients. The promotion of angiogenesis plays an important role in wound healing. Cell-Free Fat...
Chronic wounds that fail to heal are the most common complications experienced by diabetic patients, and current treatment remains unsatisfactory, mainly due to the vulnerability of diabetic wounds to bacterial infections. Chitosan derivatives are widely used to treat chronic wounds due to their excellent hydrophilicity, biodegradability, and antimicrobial activity and substantial contribution to tissue regeneration. However, the antimicrobial effect of chitosan is not sufficient due to the complicated pathological mechanism of diabetes mellitus. Here, we prepared carboxymethyl chitosan-grafted polyvinylpyrrolidone-iodine (CMC-g-PVPI) microspheres and used them to treat chronic wounds. Carboxymethyl chitosan (CMC) was used as the skeleton and was grafted with polyvinylpyrrolidone-iodine (PVPI) to form a CMC-g-PVPI complex hydrogel and CMC-g-PVPI microspheres, which formed as a result of the high shearing dispersion of the complex hydrogel. In vivo experiments on diabetic wounds revealed significantly accelerated wound closure in the presence of the microspheres, demonstrating the excellent potential of CMC-g-PVPI to promote skin wound regeneration under diabetic conditions.
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