OBJECTIVE To understand the drug resistance,serotypes,virulence-associated genes and epidemiologi-cal characteristics of group B Streptococcus(GBS)isolated from puerpera in this area so as to provide bases for prevention of mother-to-infant infections.METHODS Totally 67 strains of GBS were isolated from obstetrics out-patient department of The First Affiliated Hospital of Nanchang University from Jan.2023 to Dec.2023.The spe-cies of the strains were identified by VITEK MS,the drug susceptibility testing was carried out by disc diffu-sion method.Multilocus sequencing types,capsular types,virulence genes and drug resistance genes were analyzed by means of whole genome sequencing technique.RESULTS The 67 strains of GBS were sensitive to penicillin,vancomycin,ceftriaxone and linezolid;the drug resistance rates to erythromycin and clindamycin were 76.12％and 55.22％,respectively.All strains fell into 7 serotypes,with serotype V predominant;21 sequence types were in-volved,with ST529 most prevalent;8 clonal complexes(CCs)were involved,with CC12 most common.Totally 17 types of drug resistance genes were identified,and the carrying rate of macrolide resistance gene ErmB was highest.Among all the virulence genes except for the adhesion genes fbsA and fbsB,the carrying rates of 18 genes involving in invasion,adhesion,and immune evasion-associated virulence genes were more than 86.57％;67.16％of the strains co-expressed both PI-1 and PI-2a pilus islands.CONCLUSIONS The drug resistance rate of the GBS strains isolated from the puerpera is high,and the strains carry multiple drug resistance genes and viru-lence genes and present with molecular clonal diversity.The serotype V/ST529 is the predominant clone,for which the prevention and control should be strengthened.

OBJECTIVE To understand the drug resistance,serotypes,virulence-associated genes and epidemiologi-cal characteristics of group B Streptococcus(GBS)isolated from puerpera in this area so as to provide bases for prevention of mother-to-infant infections.METHODS Totally 67 strains of GBS were isolated from obstetrics out-patient department of The First Affiliated Hospital of Nanchang University from Jan.2023 to Dec.2023.The spe-cies of the strains were identified by VITEK MS,the drug susceptibility testing was carried out by disc diffu-sion method.Multilocus sequencing types,capsular types,virulence genes and drug resistance genes were analyzed by means of whole genome sequencing technique.RESULTS The 67 strains of GBS were sensitive to penicillin,vancomycin,ceftriaxone and linezolid;the drug resistance rates to erythromycin and clindamycin were 76.12％and 55.22％,respectively.All strains fell into 7 serotypes,with serotype V predominant;21 sequence types were in-volved,with ST529 most prevalent;8 clonal complexes(CCs)were involved,with CC12 most common.Totally 17 types of drug resistance genes were identified,and the carrying rate of macrolide resistance gene ErmB was highest.Among all the virulence genes except for the adhesion genes fbsA and fbsB,the carrying rates of 18 genes involving in invasion,adhesion,and immune evasion-associated virulence genes were more than 86.57％;67.16％of the strains co-expressed both PI-1 and PI-2a pilus islands.CONCLUSIONS The drug resistance rate of the GBS strains isolated from the puerpera is high,and the strains carry multiple drug resistance genes and viru-lence genes and present with molecular clonal diversity.The serotype V/ST529 is the predominant clone,for which the prevention and control should be strengthened.

Objective To investigate the effect of docosahexaenoic acid(DHA)on human colon cancer cell line HT-29 and underlying mechanism.Methods Human colon cancer cell line HT-29 was incubated with DMSO(control),DHA(25,50,100 μmol/L)and 100 μmol/L DHA and/or 30 μmol/L 740Y-P.Proliferation was examined by MITT;apoptosis was detected by annexin V-FITC/PI.Western blot was used for detection of protein expression of Bcl-2,Bax apoptosis-related protein and PI3K/Akt/mTOR pathway,and RT-qPCR was used for checking mRNA expression of NLRP3/Caspase-1/IL-1β pathway.Results Compared with the control group,DHA 25,50,and 100 μmol/L treatment of HT-29 cells resulted in decreased cell survival(P＜0.05),increased apoptosis(P＜0.05),decreased Bcl-2/Bax ratio(P＜0.05)and decreased phosphorylation of PI3K,Akt and mTOR in HT-29 cells(P＜0.05 or P＜0.01).Expressions of NLRP3,Caspase-1 and IL-1 β mRNA were decreased(P＜0.05).In addition,cell viability,protein phos-phorylation(p-PI3K,p-Akt,p-mTOR)and relative mRNA expression of NLRP3,Caspase 1,and IL-1β were lower in HT-29 cells which were co-incubated with DHA 100 μmol/L and 740Y-P 30 μmol/L than those in the control group(P＜0.05 or P＜0.01)and 740Y-P 30 μmol/L group(P＜0.05),while higher than that of DHA 100 μmol/L group(P＜0.05 or P＜0.01).Conclusions DHA inhibits the proliferation of human colon cancer cell line HT-29,its mecha-nism is potentially related to the inhibition of PI3K/Akt/mTOR and NLRP3/Caspase-1/IL-1 β signaling pathways.

Objective To assess the clinical value of MPI with ATP intervention (ATP-MPI) in the diagnosis of coronary heart disease (CHD).Methods To collect published literatures on ATP-MPI studies for the diagnosis of CHD,the PubMed,the Excerpta Medica Database (EMbase),Chinese Biomedical Literature Database (CBMdis),Vip and China National Knowledge Infrastructure (CNKI) databases were searched with computer and manual method since the data were available until to 2014.According to the inclusion and exclusion criteria,the literatures were screened to extract data by two independent evaluators.Meta-analysis was conducted with Stata 12.0 software.Results A total of 11 studies involving 968 patients were included.In patient study,which included 9 literatures and 933 patients,the Se,Sp,LR+,LRand 95％ CI of ATP-MPI diagnosis of CHD were 0.89 (0.82-0.94),0.84 (0.74-091),6.00 (3.25-9.91),0.13 (0.07-0.22),respectively.The diagnostic odds ratio (DOR) was 45.04.The AUC of summary ROC (SROC) curve was 0.94.In the coronary artery study,which included 6 literatures and 1 079 coronary arteries,the Se,Sp,LR+,LR-and 95％ CI of ATP-MPI diagnosis of coronary stenosis were 0.83 (0.71-0.91),0.92 (0.86-0.95),10.00 (5.58-16.99),0.18 (0.09-0.34),respectively.The DOR was 53.24 and the SROC AUC was 0.94.Conclusion ATP-MPI has a significant value in the diagnosis of CHD.

Objective:To study the protective effects of collagen peptide-chromium (Ⅲ) complex (CPCC) on alloxan-induced hepatic injury in mice. Method:The mice were divided into three groups (normal, model, CPCC) and given (po.) water, water and CPCC (Cr3+40?g/kg?d) respectively once a day. After 4 weeks, the model and CPCC groups were injected with alloxan. Then the levels of liver index, serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP) were measured. Activities of superoxide dismutase (SOD) ,glutathione peroxidase (GSH-Px) and contents of malondialdehyde (MDA) in liver were tested. Also liver pathological changes were observed. Results:CPCC could reduce the levels of liver index, serum levels of AST,ALT and ALP as well as contents of MDA and activities of SOD and GSH-Px in liver. Hepatocytes lesion was alleviated markedly. Conclusion:CPCC has protective effects on alloxan-induced hepatic injury in mice.