Objective To predict and screen the B-cell epitopes on nucleoprotein(NP)of human avian H5N1 virus strain.Methods As NP nucleotide sequences of strain A/GD/01/06(H5N1)were sequenced,B-cell epitopes were predicted by the analysis of the flexible regions of secondary structure for NPprotein and by screening on B-cell epitopes for NP protein with methods of Hydrophilicity Plot by KyteDoolittle,Surface Probability Plot by Emini,and Antigenic Index by Jameson-Wolf.Then a screening method was established by Hierarchical cluster,Bivariate correlate and Quartiles in SPSS13.0.and the variation of amino acids in NP protein was appraised in epitope prediction.Resuits The computer-predicted most possible epitopes for NP protein were located within or nearby its N-terminal 317-326,452-457,467-473,367-370,491-498,375-378,171-177,48-53,245-250.76-104 and so on.NP protein in A/GD/01/06(H5N1)increased a glycoprotein domain(NES368-370)by the substitution of N370S and changed the bio-features.Conclusion Stepwise prediction of the B-cell epitopes for the NP protein based on multiple parameters is helpful for the molecular-immunology and drug-screening,and the substitution of N370 S in NP of A/GD/01/06(H5N1)varied its antigenicity but didn't change the epitope size(SNEN367-370).

Gene analysis of the first family with ?-thalassemia in Xinjiang was carried out by polymerase chain reaction (PCR) in combination with dot blot hybridization of allele -specific oligonucleotide (ASO) probes. Seven of the 12 family members were heterozygous for the IVS- Ⅱ-654 (C→T) mutation. The abnormal ? gene of proband was confirmed from the paternal side according to family survey, clinical syndrome and hematological data.

Objective:To investigate the association between the single nucleotide polymorphisms(SNPs) of transporter associated with interleukin2(IL-2),interleukin4(IL-4)and the susceptibility of hepatitis B in north China.Methods:Genomic DNA was extracted from the peripheral blood leukocytes of hepatitis B patients and healthy controls.Two fragments covering -330 of the IL-2 gene and -590 of the IL-4 gene were amplified by polymerase chain reaction (PCR).The SNPs were revealed by restriction fragment length polymorphism (RELP).Software PHASE 1.0was used to construct the haplotype of every individual.Unconditional Logitic regression model was used to analyze the statistical association of genotype or haplotype in two groups adjusted by gender and age.Results:There was significant difference in the SNPs of IL2 between the healthy controls and the heptitis B patients in north China.Significant difference was also found in the combination of --/GT to the two groups.Conclusion:SNPs of IL2(-330) may have relation to the susceptibility o heptitis B.--/GT was also related to the susceptibility of heptitis B.These findings suggest that SNPs of IL2 is one of the important host factors to the infection of the heptitis B.

Objective To investigate the effect and the mechanism of up-regulating histone acetylizad level with a selective inhibitor of HDACs-Valproate acid sodium (VPA) on breast cancer cell proliferation. Methods MCF-7 cells were cultured with 0.75-4.0 mmol/L valproic acid (VPA) for 24, 48, 72, 96 hours in vitro, the inhibiting rate was tested by MTT assay. Cell cycle was analyzed by flow eytome- try with PI assay, and the protein and mRNA expressions of Cyelin A, Cyclin DI, Cyclin E, P21Waf/cipl of MCF-7 cells after 1.5, 3.0 mmol/ L VPA treated were analyzed by indirect immunofluorescence technique and RT-PCR respectively. Results After cultured with 0.75 -4.0 mmol/L valproic acid (VPA) for 24, 48, 72, 96 hours, the inhibiting rate of experimental groups increased significantly(P<0.01) and a dose and acting time dependent manner was found. As to cell cycle, the percentages of GI, S, M phrase in control groups remained the same. Contrary to control groups, 0. 75 -4.0 mmo]/L VPA induced a significant arrest in G1 phrase ( P<0.01), and a total of 55.4% -82.8% G1 phrase ratio were found. P21Waf/cipl was up-regulated both at the mRNA and protein level while Cyclin D1 was down-regulated ( P<0.001). Conversely, neither mRNA nor protein expression of Cyclin A, Cyclin E showed difference ( P>0.05). Conclusions Up- regulating histone acetylizad level can inhibit breast cancer cell proliferation, induce cell cycle arrest in G1 phrase. VPA, as a I class of histone deaeetylase inhibitor, can be used as an option in the treatment of breast cancer. The mechanism may include up-regulating P21Waf/cipl mRNA and protein expression and down-regulating Cyclin D1 mRNA and protein expression.

Objective:To investigate modulation of a specific HDAC inhibitor,Valproate acid sodium(VPA),on expression of Caspase3,Caspase8,Caspase9 by inhiting HDAC,as well as apoptosis rate of cancer cells treated with VPA and the specific inhibitors of Caspase3,Caspase8,Caspase9.Methods:Heptocellular carcinoma cells-HepG2,gastric carcinoma cells-BGC-823 and breast cancer cells-MCF-7 were cultured with 0.75-4.0 mmol/L of VPA for 48 hrs in vivo,apoptosis was analyzed by flow cytometry with Annexin V/PI assay.The activities and protein expressions of Caspase3,Caspase8,Caspase9 were detected by spectrophotometry and indirect immunofluorescence technique.Results:Contrary to control groups,VPA at concentrations between 0.75 and 4.0 mmol/L induced a significant apoptosis in HepG2,BGC-823,MCF-7 cells(P0.05).The apoptosis rates of cancer cells treated with VPA and specific inhibitors of Caspase3,Caspase9 together was lower than in the groups with VPA treatment singlely(P

Objective:To explore the effect of combined therapy of traditional Chinese medicine on prevention of chemotherapy-related anemia in malignant tumors.Methods:Seventy-nine patients with malignant tumors diagnosed in Zibo Hospital of Traditional Chinese Medicine from January 2019 to January 2021 were selected, and the patients were divided into experimental group (40 cases) and control group (39 cases) according to the random number table method. The control group received chemotherapy and the experimental group received chemotherapy and combined therapy of traditional Chinese medicine (Wuhong Tang combined with moxibustion). The hemoglobin (Hb) level, Karnofsky score and adverse effects were recorded before and on days 7, 14 and 21 after chemotherapy in the two groups.Results:The Hb level in the experimental group was higher than that in the control group [(117±28) g/L vs. (100±31) g/L] on day 21 after chemotherapy, and the difference was statistically significant ( t = -3.08, P = 0.030). The total effective rate of the experimental group was higher than that of the control group [85% (34/40) vs. 66.7% (26/39)], but the difference was not statistically significant ( χ2 = 4.96, P = 0.084). Karnofsky scores were (77±9) points and (77±12) points before and on day 21 after treatment in the experimental group, with no statistical difference ( t = -0.50, P = 0.623); Karnofsky scores were (78±10) points and (67±9) points in the control group, with statistical difference ( t = 8.32, P < 0.001). There was no statistical difference in Karnofsky score before treatment between the two groups ( t = 1.85, P = 0.068), but the experimental group was higher than the control group on day 21 after treatment ( t = 4.88, P < 0.001). The difference in the incidence of nausea and vomiting between the two groups was not statistically significant ( P > 0.05), and no chemotherapy-related hepatic, renal or cardiac adverse reactions were observed in either group. Conclusions:Combined therapy of traditional Chinese medicine could effectively prevent chemotherapy-related anemia and improve the quality of life of patients.

Objective:To investigate the unqualified hepatitis C virus (HCV) detection result of blood donors from the served area of blood institutions.Methods:The data related to HCV markers detected of the first and repeat blood donors were collected from the system of practice comparison for the Chinese mainland blood institutions from 2017 to 2021. The anti-HCV reactive rate and the rates of anti-HCV negative but HCV-RNA reaction and all the relationship between rates and the annual, regional and different blood donors were statistically analyzed.Results:During 2017-2021, the number of anti-HCV reactive per 100 000 blood donors decreased from 444.3 to 250.44 in the served area of 22 blood institutions ( χ2=49.677, P<0.05). The number of HCV RNA detected positive per 100 000 anti-HCV negative increased from 0.69 to 2.05 year by year, but there was no statistical significance ( χ2=0.643, P>0.05). The anti-HCV unqualified rate was significantly different among regions ( χ2=3 260.283, P<0.05). The anti-HCV unqualified rate of the first blood donors was significantly higher than that of the repeated blood donors ( F=130.993, P < 0.05). The annual number of HCV RNA detected positive per 100 000 anti-HCV negative blood samples from donors ranged from 0 to 17.28. Conclusions:The anti-HCV unqualified rate of blood donors in the served area of 22 blood institutions decreased year by year. Compared with repeated blood donors, HCV infection should be emphasized in first-time blood donors. The implementation of HCV RNA test can detect out much more HCV infections and reduce the risk of transfusion transmitted infectious HCV.

Objective To understand the distribution and the characteristics on molecular typing of Salmonella (S.) typhimurium isolates gathered from the surveillance program and to construct the standard S.typhimurium databank in the laboratory through surveillance network PulseNet,in Guangdong province to improve the capability of detection on laboratory-based foodbome outbreaks.Methods With the application of standard pulse-field gel electrophoresis (PFGE) and multiple loci VNTR analysis (MLVA) including seven VNTRs loci protocols on PulseNet International Network,275 isolates of S.typhimurium from ten cities in Guangdong province were typed and their patterns analyzed.The molecular typing databank was constructed by BioNumerics.Results With S.typhimurium the most common serotypes,the average annual positive rate of Salmonella strains and S.typhimurium were 4.03％ and 1.38％ respectively.The positive rate and proportion presented a double-peak trend,appearing in May and September.The chromosomal DNA of S.typhimurium was digested with Xba Ⅰ restricted endonucleotidase and 124 PFGE patterns were observed after pulse-field gel electrophoresis,with the discrimination index (D) as 0.928 6.The patterns including more than three S.typhimurium isolates and were further digested with the second enzyme Bln Ⅰ to achieve 174 patterns,with the D value as 0.989 1.Under MLVA method,143 variant patterns were obtained,with the D value reaching 0.966 5.Data showed that the discriminatory ability of the MLVA typing method in S.typhimurium was superior to PFGE-Xba Ⅰ but equal to PFGE-Xba Ⅰ-Bln Ⅰ.In addition,when S.typhimurium strains were respectively analyzed by PFGE under double enzymes digestion and MLVA,the results appeared coincident and relative.Conclusion The variant patterns showed by the two molecular typing methods indicating a genetic diversity existed among the clinical S.typhimurium isolates in Guangdong province.Databank of S.typhimurium was constructed and could be used in laboratory surveillance programs.Under the characterization of analyzing similarity and evolution among S.typhimurium isolates,MLVA was suitable for cluster analysis on early detection of outbreaks caused by S.typhimurium.

【Objective】 To optimize the purification conditions of heparin affinity chromatography in the purification of human coagulation factor Ⅸ by response surface method and establish the optimal chromatography process parameters. 【Methods】 The effect of sample loading temperature on purification efficiency was analyzed through single factor test. Three-factor three-level response surface method was used to optimize the chromatographic elution conditions. The Folin phenol method and the automatic hemagglutination analyzer were used to determine the total protein content and human coagulation factor Ⅸ titer, respectively. The purification effect was evaluated by activity index and process recovery rate. 【Results】 The optimized optimal chromatographic conditions were loading at 5 ℃, washing 4 CV, eluent formulation of sodium citrate 20 mmol/L, arginine hydrochloride 18.7 mmol/L, NaCl 611.6 mmol/L and pH 7.5; under this optimal setting, the recovery rate of the chromatographic process was (46.6±2.9) %, titer of factor Ⅸ rated to (68.4±4.7) IU/mL and specific activity was (62.8±3.3) IU/mg. 【Conclusion】 The optimized parameters of heparin affinity chromatography process by response surface method can produce better purification effect on human coagulation factor Ⅸ.

Objective Based on the gene expression omnibus(GEO)database,bioinformatics methods were employed to analyze the expression characteristics of hypoxia-related differentially expressed genes(HRDEGs)in ischemic stroke,and key genes were screened,to provide important support for a deeper understanding of ischemic stroke.Methods The GSE16561 and GSE58294 datasets were downloaded from the GEO database,and Python software was used for data integration.The Combat method was employed to eliminate batch effects while retaining disease grouping characteristics.Principal component analysis was conducted to reduce dimensionality of the data before and after batch effect removal,and intraclass correlation coefficient(ICC)testing was performed on the ischemic stroke and normal control groups.Gene set enrichment analysis(GSEA)and single-sample GSEA were conducted on the merged and batch effects eliminated dataset,with a nominal P-value(NOM P-val)＜0.05 and false discovery rate P-value(FDR P-val)＜0.25 used as criteria to select significantly different gene sets.Differential expression genes between the ischemic stroke samples and normal control samples after merging and eliminating batch effects of the GSE16561 and GSE58294 datasets were identified using R software,with an absolute value of log2 gene expression fold change(FC)≥0.58 and adjusted P-value(Padj)＜0.05 as selection criteria.Intersection with hypoxia-related genes obtained from the National Center for Biotechnology Information(NCBI)in the United States yielded the HRDEGs.Gene ontology(GO)and Kyoto encyclopedia of genes and genomes(KEGG)enrichment analyses were performed on the HRDEGs,and the STRING database was used to construct a protein-protein interaction network of differentially expressed genes.The top 10 key genes were filtered using Cytoscape 3.8 software.Results The ICC analysis results showed excellent consistency in the ischemic stroke and normal control samples after batch effect removal,with ICC values of 0.94 and 0.98 for the GSE16561 and GSE58294datasets,respectively.GSEA results demonstrated significant enrichment of 34 gene sets in the stroke samples in the newly merged and batch effects removed dataset from GSE16561 and GSE58294,leading to the identification of 404 differentially expressed genes(all with Padj＜0.05),including 354 upregulated genes and 50 downregulated genes.Intersection with hypoxia-related genes yielded 64 HRDEGs.GO enrichment analysis indicated significant enrichment of HRDEGs in vesicle lumen,cytoplasmic vesicle lumen,secretory granule lumen,with molecular functions such as amide binding,peptide binding,phospholipid binding,and enzyme inhibitor activity.These genes are primarily involved in the positive regulation of cytokine production,regulation of immune response,response to bacterium-derived molecules,and response to lipopolysaccharide,among other biological processes.KEGG enrichment analysis revealed enrichment of HRDEGs in pathways related to lipid and atherosclerosis,Salmonella infection,neutrophil extracellular trap formation,nucleotide-binding oligomerization domain-like receptor signaling pathway,protein glycosylation in cancer,tuberculosis,and necroptosis.Based on the protein-protein interaction network,10 key genes were identified,including arginase1(ARG1),caspase1(CASP1),interleukin1 receptor type 1(IL-1R1),integrin subunit alpha M(ITGAM),matrix metalloproteinase9(MMP9),prostaglandin-endoperoxide synthase 2(PTGS2),signal transducer and activator of transcription 3(STAT3),Toll-like receptor2(TLR2),TLR4,and TLR8.Conclusion This study has identified 10 key genes associated with ischemic stroke and hypoxia through bioinformatics mining,which maybe provid potential targets for subsequent research and diagnostic and therapeutic interventions.