Scutellarin protects human cardiac microvascular endothelial cells with hypoxia-reoxygenation injury via JAK2/STAT3 signal pathway

Objective: To investigate the antagonistic cell injury effect and molecular mechanism of scutellarin(SCU)in hypoxia reoxygenation(HR) treated human cardiac microvascular endothelial cells(HCMECs).Methods: The method of 12 h hypoxia following by 12 h reoxygenation was used to culture HCMECs in vitro to built cell injury model. The groups were divided into control group, model(HR) group, and HR + SCU(0.1 μmol/L, 1 μmol/L, and 10 μmol/L) group. The cell viability was determined by MTT, and oxidative stress was detected by malondialdehyde(MDA) levels by biochemical assay kit. Protein expression of JAK2/p-JAK2 and STAT3/p-STAT3 were evaluated by Western blot.Results: The results of MTT and MDA showed that HR decreased the cell viability(P < 0.05) and increased MDA level significantly(P < 0.05), SCU played a contrary role in these processes. Western blot analysis indicates that, the expression of JAK2 and p-JAK2, STAT3, and p-STAT3 were increased in model group when compared with control group(P < 0.05); Compared with model group, their expression were reduced by SCU(P < 0.05).Conclusion: SCU took a protective effect on HR-treated HCMECs, and the molecular mechanism may be associated with the inhibition of JAK2/STAT3 signal transduction pathway.

Preparation of green cellulose diacetate-based antibacterial wound dressings for wound healing

Managing wounds is a growing universal problem and developing effective wound dressings to staunch bleeding and protect wounds from bacterial infections is an increasingly serious challenge.In this work,a remolding electrospinning nanofiber three-dimensional structure wound dressing(CCP)was prepared with superhydrophilicity,high water absorption and absorbing capacity,excellent hemostatic capacity and antibacterial ability,and biocompatibility to promote wound healing.Polyhexamethylene guanidine hydrochloride(PHMG)was grafted to cellulose diacetate(CDA)wound dressing surface through an amide reaction.A water contact angle analysis demonstrated that CCP wound dressing could be beneficial to promote wound exudate management effectively with rapid absorption of water within 0.2 s.In vitro hemo-and cytocompatibility assay showed that a CCP wound dressing had no significant hemotoxicity or cytoxicity.Specifically,CCP wound dressings could be beneficial to accelerate wound hemostasis and further reduce mortality caused by uncontrolled bleeding.Furthermore,CCP wound dressings have an excellent antibacterial ability,which could be beneficial to inhibit wound inflammatory over-reaction and promote normal wound healing.Combined together,the prepared wound dressing in this research effort is expected to have high-potential in clinical applications.