Wound ulceration caused by diabetes is a typical chronic wound wherein healing the local tissue is difficult due to lack of blood vessels and tissue necrosis caused by the long-term accumulation of free radicals.Near-...Wound ulceration caused by diabetes is a typical chronic wound wherein healing the local tissue is difficult due to lack of blood vessels and tissue necrosis caused by the long-term accumulation of free radicals.Near-field electrospinning(NFES)is an innovative technology used to produce micro-nano-scaled,controllable sequencing fibers.In this study,we constructed a novel wound dressing based on the NFES polycaprolactone(PCL)fiber network and modified gelatin with methacrylic anhydride(GelMA)hydrogel to promote angiogenesis and the re-epithelialization of diabetic wounds.An angiogenic and antioxidant drug named deferoxamine(DFO)was encapsulated in a GelMA hydrogel to achieve a slow-release effect that is more suitable for chronic wounds.The cell adhesion experiment showed that the cells could attach to the fibers in the dressing group having a network of PCL fibers on the surface and grow along the direction of the fibers,which in turn,effectively regulates cell behavior from the physical structure.Additionally,the large pore size(~500μm)of the network allowed the cells to penetrate the pores and enter the surface of the hydrogel without being blocked out.Besides,the composite dressing had a notable effect on angiogenesis.Furthermore,antioxidation experiments confirmed that the DFO-loaded hydrogel exhibited antioxidant activity.Experimental animal models of diabetes showed that rats treated with the PCL-GelMA-DFO(PGD)hydrogel had faster ability of hemostasis,scab formation,and wound healing.In conclusion,the PGD hydrogel effectively promoted the repair of chronic wounds.展开更多
Rare earth orthoferrites(RFeO3,R=Y,Gd,Sm,Nd)have recently attracted much attention due to their novel magnetic and electrical properties such as magneto-electrics,magneto-dielectrics.and magneto-optics[1-3].The comple...Rare earth orthoferrites(RFeO3,R=Y,Gd,Sm,Nd)have recently attracted much attention due to their novel magnetic and electrical properties such as magneto-electrics,magneto-dielectrics.and magneto-optics[1-3].The complex interactions between the two sublattices of R^3+and Fe^3+in RFeO3 provide the feasibility of control-ling spins in these solids,which makes them promising candidates for the spintronics[4].展开更多
基金We sincerely acknowledge the funding from the Science and Technology Planning Project of Shenzhen Municipality(Nos.JCYJ20180306174831458 and JCYJ20190807155801657)the National Natural Science Foundation of China(Nos.51973243 and 52173150)+3 种基金Guangdong Innovative and Entrepreneurial Research Team Program(No.2016ZT06S029)Key international(regional)cooperative research projects of the National Natural Science Foundation of China(No.5181001045)The International Science and technology cooperation project of Shenzhen Municipality(No.GJHZ20200731095008026)Public welfare project of Futian District Health Bureau(No.FTWS2021001).
文摘Wound ulceration caused by diabetes is a typical chronic wound wherein healing the local tissue is difficult due to lack of blood vessels and tissue necrosis caused by the long-term accumulation of free radicals.Near-field electrospinning(NFES)is an innovative technology used to produce micro-nano-scaled,controllable sequencing fibers.In this study,we constructed a novel wound dressing based on the NFES polycaprolactone(PCL)fiber network and modified gelatin with methacrylic anhydride(GelMA)hydrogel to promote angiogenesis and the re-epithelialization of diabetic wounds.An angiogenic and antioxidant drug named deferoxamine(DFO)was encapsulated in a GelMA hydrogel to achieve a slow-release effect that is more suitable for chronic wounds.The cell adhesion experiment showed that the cells could attach to the fibers in the dressing group having a network of PCL fibers on the surface and grow along the direction of the fibers,which in turn,effectively regulates cell behavior from the physical structure.Additionally,the large pore size(~500μm)of the network allowed the cells to penetrate the pores and enter the surface of the hydrogel without being blocked out.Besides,the composite dressing had a notable effect on angiogenesis.Furthermore,antioxidation experiments confirmed that the DFO-loaded hydrogel exhibited antioxidant activity.Experimental animal models of diabetes showed that rats treated with the PCL-GelMA-DFO(PGD)hydrogel had faster ability of hemostasis,scab formation,and wound healing.In conclusion,the PGD hydrogel effectively promoted the repair of chronic wounds.
基金the National Key Research and Development Program of China(2016YFB0700901,2017YFA0206303,2017YFA0206301 and 2017YFA0403701)the National Natural Science Foundation of China(51731001,11675006 and11805006)。
文摘Rare earth orthoferrites(RFeO3,R=Y,Gd,Sm,Nd)have recently attracted much attention due to their novel magnetic and electrical properties such as magneto-electrics,magneto-dielectrics.and magneto-optics[1-3].The complex interactions between the two sublattices of R^3+and Fe^3+in RFeO3 provide the feasibility of control-ling spins in these solids,which makes them promising candidates for the spintronics[4].
