ABSTRACT
Ultra-performance liquid chromatography-quadrupole-electrostatic field Orbitrap mass spectrometry(UHPLC-Q-Exactive Orbitrap MS/MS) was used for rapid identification of the chemical components in Kaixin San substance benchmark. The gradient elution was performed through a Waters ACQUITY~(TM) BEH C_(18) column(2.1 mm×150 mm, 1.7 μm) with water-acetonitrile as mobile phase, a column temperature of 30 ℃, a flow rate of 0.3 mL·min~(-1), and a sample size of 1 μL. The scanning was performed in the negative ion mode. The complex component groups in Kaixin San substance benchmark were quickly and accurately identified and clearly assigned based on the comparison of the retention time and MS data with those of the reference substance as well as the relative molecular weight of the same or similar components in the mass spectrum database and literature. A total of 77 compounds were identified, including 26 saponins, 13 triterpenoid acids, 20 oligosaccharide esters, 5 xanthones, and 13 other compounds. The qualitative method established in this study can systematically, accurately, and quickly identify the chemical components in Kaixin San substance benchmark, which can provide a basis for the further analysis of its active components in vivo and the establishment of its quality control system.
Subject(s)
Benchmarking , Chromatography, High Pressure Liquid/methods , Drugs, Chinese Herbal/chemistry , Tandem Mass Spectrometry/methodsABSTRACT
We analyzed the antimicrobial resistance and pulsed field gel electrophoresis (PFGE) patterns of Salmonella strains of infectious diarrhea isolated four hospitals in Shenzhen during 2012-2016.A total of 137 Salmonella strains collected in 4 hospitals in Shenzhen were identified by serotyping,micro-dilution method was used to detect the antimicrobial susceptibility of the isolates.Pulsed field gel-electrophoresis(PFGE) was used for molecular typing and cluster analysis of S.typhimurium and S.enterica strains.Results showed that 137 strains of Salmonella were divided into 30 kinds of serotype.S.typhimurium was the predominant serotype.The drug susceptibility test indicated that the antibiotic resistance of the strains to chloromycetin,ampicillin and amoxicillin were more serious than other drugs,the resistance to penicillins,cephalosporins,aminolycosides and macrolides showed increase trends year by year.Of 49 strains of S.typhimurium were divided 38 molecular patterns by PFGE,with similarity ranged from 65.5％ 100％,TY18 was the main PFGE pattern.The 27 strains of S.enterica were divided into 7 molecular patterns by PFGE,with similarity ranged from 61.8％-100％,EN7 was the main PFGE pattern.The status of drug resistance of infectious diarrhea isolates was rather severe,PFGE patterns showed diversity,suggesting the diarrhea cases were distributed sporadically.Partial PFGE patterns and its corresponding antidrug spectrum have certain aggregation relationship.
ABSTRACT
Objective:To investigate the effect of miR-125 b on ART4 protein and its effect on proliferation and invasion of hep-atocellular carcinoma cells .Methods:The expression of miR-125 b in hepatocellular carcinoma and hepatocellular cells was detected by qPCR.The expression of miR-125b and ART4 was detected by qPCR after overexpression of miR-125b.The expression of miR-125b and ART4 was detected by double luciferase assay .The effect of miR-125 b on the proliferation of hepatoma cells was detected by MTT assay.The effect of miR-125b on the invasion of hepatoma cells was detected by Transwell invasion assay .MTT assay was used to detect the effect of miR-125 b on the proliferation of hepatoma cells after overexpression of ART 4.Transwell invasion assay was used to detect the effect of miR-125 b on the invasion of hepatoma cells after overexpression of ART 4.Results: The expression of miR-125 b in hepatoma cells was low,and overexpression of miR-125b could inhibit the expression of ART4 protein.Overexpression of miR-125b could inhibit the proliferation and invasion of hepatoma cells .Overexpression of ART4 could reverse the proliferation and invasion of hepatoma cells by miR-125b.Conclusion:Expression of miR-125b in hepatocellular carcinoma was down-regulated.Meanwhile,miR-125 b can regulate the expression of ART 4 and affect the proliferation and invasion of hepatoma cells .
ABSTRACT
Hepatitis B virus (HBV) infection has been one of the most important public health problems,however,no complete cure is currently available.Although interferon (IFN)-α has been clinically used as a drug for chronic hepatitis B therapy because of its advantages including a higher rate of HBsAg/HBeAg seroconversion and a lower rate of recurrence after cessation of treatment,only 20％ -40 ％ of patients respond well to IFN therapy,thus hampering its clinical application.In recent years,based on the in vitro HBV replication and infection cell models,animal models and patient cohort with hepatitis B and by using a variety of methods,studies have been made.On the one hand,to identify new mechanisms underlying the IFN-and IFN-induced genes-mediated anti-HBV activities and signaling transduction,on the other hand,to reveal the effect and mechanisms of HBV replication and viral proteins in regulating the innate immune signaling pathways and IFN induction and antiviral action,based on which new strategies and approaches for optimization of IFN-based therapy and for a HBV cure have been further explored.This review mainly introduces the research findings of author's group and the future development is prospected.