Construction of Novel Nanocomposites (Cu-MOF/GOD@HA) for Chemodynamic Therapy.

The emerging chemodynamic therapy (CDT) has received an extensive attention in recent years. However, the efficiency of CDT is influenced due to the limitation of H2O2 in tumor. In this study, we designed and synthesized a novel core-shell nanostructure, Cu-metal organic framework (Cu-MOF)/glucose oxidase (GOD)@hyaluronic acid (HA) (Cu-MOF/GOD@HA) for the purpose of improving CDT efficacy by increasing H2O2 concentration and cancer cell targeting. In this design, Cu-MOF act as a CDT agent and GOD carrier. Cu(II) in Cu-MOF are reduced to Cu(I) by GSH to obtain Cu(I)-MOF while GSH is depleted. The depletion of GSH reinforces the concentration of H2O2 in tumor to improve the efficiency of CDT. The resultant Cu(I)-MOF catalyze H2O2 to generate hydroxyl radicals (·OH) for CDT. GOD can catalyze glucose (Glu) to supply H2O2 for CDT enhancement. HA act as a targeting molecule to improve the targeting ability of Cu-MOF/GOD@HA to the tumor cells. In addition, after loading with GOD and coating with HA, the proportion of Cu(I) in Cu-MOF/GOD@HA is increased compared with the proportion of Cu(I) in Cu-MOF. This phenomenon may shorten the reactive time from Cu-MOF to Cu(I)-MOF. The CDT enhancement as a result of GOD and HA effects in Cu-MOF/GOD@HA was evidenced by in vitro cell and in vivo animal studies.

[Pharmacovigilance in materia medica works of Qing Dynasty].

Taking the Zeyao Materia Medica,Benjing Fengyuan,De Pei Materia Medica,Shiyi Materia Medica,Harmful Benefits of Materia Medica as representative works in Qing Dynasty,this paper extracts text information from four aspects: drug identification,drug use,drug prevention and detoxification,constructs a drug pharmacovigilance information table of Qing Dynasty herbal works,and summarizes the drug pharmacovigilance of Qing Dynasty. Thought,in the Qing Dynasty,there were many recordings of drug pharmacovigilance. In the aspect of drug awareness,the main representative was Shi Yi Materia Medica which added many new drugs and introduced more new uses of drugs. In addition,in the aspect of drug use and prevention,the main representatives were Zeyao Materia Medica,Benjing Fengyuan,De Pei Materia Medica,and Harmful Benefits of Materia Medica. In the aspect of taboo of disease and syndrome,attention should be paid to the integration of medicine so as to make drugs closely related to clinical use. Although there is no special introduction on detoxification,it has been introduced in various medicines in the De Pei Materia Medica,Shiyi Materia Medica,which has a relatively systematic and complete drug warning ideology system of " drug identification-use-drug prevention-detoxification".This study found that the traditional pharmacovigilance thought of Qing Dynasty had the characteristics of attaching importance to the clinical application of toxic traditional Chinese medicine and the combination of medicine,which had certain guiding significance for modern clinical medication. This paper aims to explore the traditional drug pharmacovigilance knowledge in representative works of the Qing Dynasty,analyze the characteristics of the drug pharmacovigilance thought in the Qing Dynasty,and lay a foundation for clarifying the traditional drug pharmacovigilance system.

Mussel-inspired antibacterial polydopamine/chitosan/temperature-responsive hydrogels for rapid hemostasis.

The aim of this study was to develop an effective wound dressing using a temperature-responsive hydroxybutyl chitosan (HBC) based hydrogel. The HBC - chitosan (CS) - dopamine (HCS-DOPA) composite hydrogels were prepared by the dopamine self-polymerization at different concentrations (0, 0.5, 1.0 and 2.0 mg/mL), termed as HCS, HCS-DOPA-0.5, HCS-DOPA-1 and HCS-DOPA-2, respectively. The gelling characteristic of HBC hydrogel was not influenced by composite CS and DOPA. The HCS-DOPA composite hydrogels were non-cytotoxic to mouse fibroblast cells (L929), and induced under 5.0% hemolysis rate. In vitro antibacterial studies, composite HCS-DOPA-2 hydrogels exhibited lasting inhibition to S. aureus >8 h. The whole blood test in vitro demonstrated that blood clotting time treated with HCS-DOPA-2 composite hydrogels was shortened to 95.6 s compared with that of HCS in vitro hemostasis. The results suggested that HCS-DOPA-2 composite hydrogels could be applied as a promising wound dressing for hemostasis in vitro.

The temperature-responsive hydroxybutyl chitosan hydrogels with polydopamine coating for cell sheet transplantation.

The aim of this study was to develop an effective cell sheet translocation method using a cell adhesive and temperature-responsive hydroxybutyl chitosan hydrogel (HBC). The polydopamine (PD)-coated HBC hydrogels were prepared by the dopamine self-polymerization on the surface of HBC hydrogel with different coating time, termed as P30, P60 and P120, respectively. Gelling property of HBC was not affected by PD coating. The PD-coated HBC hydrogels promoted the attachment and proliferation of mouse fibroblast cells (L929) and human umbilical vein endothelial cells (HUVECs), and allowed formation of monolayer cell sheet. In vitro translocation of HUVECs sheet could be obtained successively through phase transition of PD coated HBC hydrogel from gel to sol, and the cells sheet transferred from P30 hydrogel to a round cell coverglass maintained relatively complete monolayer and normal cell morphology. The results showed that P30 hydrogel has the potential to be used for cell transplantation therapy.