Poly(lactic-co-glycolic acid)-Chitosan–Gelatin Composite Nanomaterials for the Treatment of Diabetic Foot Ulcer Wound Infection

In this experiment, a solid carrier was prepared with PLGA, gelatin, and chitosan as the main raw materials, so that BMSCs could exert their repairing effect directly in the ulcer area under the stimulation of Klotho protein. We chose to use electrospun PLGA as the main technical means to provide suitable adhesion growth environment for BMSCs by preparing PLGA nanofibers. At the same time, PLGA nanofibers are also a controlled release material, so that Klotho protein can remain active, thereby achieving the purpose of stimulating BMSCs for a long time. Through the nano-scale porous structure provided on the surface of the PLGA film, BMSCs can adhere well to the surface of the material and continuously receive stimulation from the inner Klotho protein. We applied this composite to mice with diabetic ulcers, and verified the effects of Klotho protein and BMSCs on DFU healing in five groups of mice. From the results, the Klotho+BMSCs group achieved the best healing effect, followed by the Klotho group alone, while the other three groups had no significant difference in healing effects. It is proved that both Klotho and BMSCs can help the healing of diabetic ulcers, but BMSCs alone cannot survive in harsh environments, and it is difficult to play a normal repair role. The purpose of this study was to investigate the effect of Klotho protein on BMSCs and ECs under high glucose conditions, and to find a suitable carrier for planting BMSCs on it. At the same time, the material also has a certain sustained release function. We have concluded that Klotho protein can promote the proliferation and migration of BMSCs and ECs under high glucose conditions. When combined with electrospinning technology to prepare a protein that can release Klotho, it also provides a microstructure suitable for BMSCs adhesion, thereby ensuring that BMSCs can successfully survive. In the end, we artificial Klotho protein can promote angiogenesis in diabetic ulcer areas by protecting BMSCs and ECs, thereby promoting healing of ulcer areas.