RESUMO
Burns are a significant public health issue worldwide, resulting in prolonged hospitalization, disfigurement, disability and, in severe cases, death. Among them, deep second-degree burns are often accompanied by bacterial infections, insufficient blood flow, excessive skin fibroblasts proliferation and collagen deposition, all of which contribute to poor wound healing and scarring following recovery. In this study, SNP/MCNs-SKN-chitosan-ß-glycerophosphate hydrogel (MSSH), a hydrogel composed of a temperature-sensitive chitosan-ß-glycerophosphate hydrogel matrix (CGH), mesoporous carbon nanospheres (MCNs), nitric oxide (NO) donor sodium nitroprusside (SNP) and anti-scarring substance shikonin (SKN), is intended for use as a biomedical material. In vitro tests have revealed that MSSH has broad-spectrum antibacterial abilities and releases NO in response to near-infrared (NIR) laser to promote angiogenesis. Notably, MSSH can inhibit excessive proliferation of fibroblasts and effectively reduce scarring caused by deep second-degree burns, as demonstrated by in vitro and in vivo tests.
Assuntos
Queimaduras , Cicatriz , Hidrogéis , Naftoquinonas , Cicatrização , Queimaduras/tratamento farmacológico , Queimaduras/patologia , Cicatrização/efeitos dos fármacos , Animais , Hidrogéis/química , Hidrogéis/farmacologia , Cicatriz/prevenção & controle , Cicatriz/patologia , Naftoquinonas/farmacologia , Naftoquinonas/uso terapêutico , Naftoquinonas/química , Antibacterianos/farmacologia , Antibacterianos/administração & dosagem , Fibroblastos/efeitos dos fármacos , Quitosana/farmacologia , Quitosana/química , Temperatura , Camundongos , Humanos , Óxido Nítrico/metabolismo , Nitroprussiato/farmacologia , Proliferação de Células/efeitos dos fármacosRESUMO
A new monoglyceride-based heat-sensitive substrate is proposed, for the first time, as a wound management system. First, an appropriate portion of glyceryl monooleate (GMO) and glyceryl monostearate (GMS) is mixed to provide a thermal phase responsive matrix (GMO-GMS, GG). Subsequently, to improve the photothermal responsive and antibacterial performance, silver nanoparticles (Ag) decorated reduced graphene oxide (rGO) nanocomposite (rGO-Ag) is added to the GG matrix to obtain (GG-rGO-Ag). According to the systematic studies from uninfected, infected, and diabetic wound models, by applying near infrared (NIR) laser, the phase change of GG-rGO-Ag can be triggered to release Ag on demand for sterilization. More importantly, this smart GG substrate can also promote the production of vascular endothelial growth factor protein, thus serving as a NIR defined mufti-effective wound management system.
