Due to oxidative stress, infection, vascular disease, inflammation and neuropathy caused by metabolic disorders induced by hyperglycemia, Diabetes mellitus (DM) patients often suffer from poor wound healing and develop diabetic foot ulcers (DFUs), which may even lead to amputation in severe cases.Through the deep understanding of the diabetic wound healing process and its pathophysiology, effective strategies for the treatment of wound injury can be obtained.Nano-preparation has been widely used in accelerating wound healing in recent years.On the one hand, nanoparticles are beneficial for diabetic wound healing; on the other hand, they can be used to deliver one or more therapeutic agents such as growth factors, nucleic acids, antibiotics and antioxidants, which can be continuously released within the target tissue.This paper reviews the application and mechanism of various nano-preparation in promoting diabetic wound healing.

To explore the improving effect and mechanism of staphylococcal nuclease(SNase)-mediated degradation of neutrophil extracellular traps(NETs)on 2, 4, 6-trinitro-benzene sulfonic acid(TNBS)-induced colitis in mice. The model of colitis in female BALB/c mice was established by intrarectal injection of 2. 5% TNBS solution, and SNase loaded by Lactococcus lactis(L. lactis)were orally administrated for 6 days. To investigate the effect of SNase-mediated degradation of neutrophil extracellular traps on colitis in mice, the experiment was divided into control group, TNBS model group, NZ900 group and L. lactis pCYT: SNase group. The daily body weight, stool consistency and bleeding of mice were observed. The pathological condition of HE in colon group was detected. The activity of MPO and the mRNA expression level of inflammatory cytokines in each group were measured, and the concentration of inflammatory factors in serum was detected. The expression of NETs level marker citH3 in colon tissue was determined by immunohistochemistry. The results showed that SNase loaded by lactis acid bacteria could alleviate the weight loss, disease activity index score, colonic length and pathological damage induced by TNBS in mice, and reduce the levels of inflammatory cytokines in serum and colonic tissue, inhibit the activity of MPO and the expression of Ly6G and citH3 in colon tissue. The preliminary mechanism showed that SNase could down-regulate the expression of inflammatory cytokines and reduce the content of NETs markers to alleviate colitis in mice.