Application of A(2)DS(2) score for predicting post-stroke pneumonia in elderly patients / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the risk factors for post-stroke pneumonia and assess the value of A(2)DS(2) score in predicting post-stroke pneumonia in elderly stroke patients.</p><p><b>METHODS</b>The clinical data were retrospectively collected from elderly stroke patients from January, 2007 to December, 2012. A(2)DS(2) score was then assigned using the clinical information from the medical record. The ability of the score to discriminate between patients with post-stroke pneumonia and those without was quantified using ROC analysis. The calibration of the score was analyzed using Hosmer-Lemeshow goodness-of-fit test.</p><p><b>RESULTS</b>A total of 131 elderly male stroke patients were enrolled in this study, among whom the incidence of post-stroke pneumonia was 29.01%. The independent risk factors for post-stroke pneumonia identified included moderate (P=0.0081, OR: 5.6089; 95%CI: 1.5663-20.0854) and severe (P=0.0048, OR: 44.4827; 95%CI: 3.1847-621.3126) neurological impairment, dysphagia (P=0.0005, OR: 7.5265; 95%CI: 2.4282-23.3292), and atrial fibrillation (P=0.0226, OR: 4.1778; 95%CI: 1.2221-14.2825). The incidence of post-stroke pneumonia ranged from 2.2% in patients with a A(2)DS(2) score less than 3 to 75% in those with a score higher than 8. The C-statistic of A(2)DS(2) score for predicting post-stroke pneumonia was 0.86 (95%CI: 0.784-0.911) by the ROC analysis. The A(2)DS(2) score was well calibrated to predict post-stroke pneumonia in elderly patients by Hosmer-Lemeshow test (7.083, P=0.528).</p><p><b>CONCLUSION</b>The A(2)DS(2) score can be useful for predicting post-stroke pneumonia and for routine monitoring of high-risk elderly stroke patients in the clinical setting.</p>

Functional study of the different haplotypes cDNA in the coding region of CⅡTA gene / 中华微生物学和免疫学杂志

Objective To study the function of 4 different haplotypes cDNA which are constructed by two non-homonymy single nueleotide polymorphism (SNP) sites C19170G (Leu45Val) and C30799G (Ala500Gly) in the coding region of human CⅡTA gene. Methods HeLa cells were transfeeted with eu-karyotic expression vectors containing four different haplotypes cDNA. C Ⅱ TA mRNA and HLA classⅡanti-gen (HLA-DR, DP, DQ) were respectively detected by RT-PCR and indirect cell immunofluoreseence tech-nique in the untransfected and transfeeted with four eukaryotic expression vectors and empty vectors HeLa cells. The quantity of HLA classⅡ antigen were analyzed by flow eytometry. Results No expression of CⅡTA mRNA and HLA class Ⅱ antigen were observed on original HeLa cells and empty vector transfected cells. CⅡTA mRNA expression was emerged, and the expression of HLA class Ⅱ antigen were observed in the HeLa cells transfected with eukaryotic expression vectors containing four different haplotypes cDNA. And there were not significantly different with the levels of HLA class Ⅱ antigen expression among HeLa cells transfected with eukaryotic expression vectors containing four different haplotypes cDNA ( P > 0.05 ). Con-dusion The SNP of Chinese at the sites C19170G(Leu45Val) and C30799G(Ala500Gly) in the coding site of C Ⅱ TA gene did not influence capability of CⅡTA trans-aetivating HLA class Ⅱgene expression.

The relationship between single nucleotide polymorphism in the coding region of class Ⅱ transactivator gene and outcomes of chronic hepatitis B virus infection / 中华传染病杂志

Objective To investigate the relationship between the non-homonymy single nucleotide polymorphism(SNP)of C19170G,C30799G in the coding area of class Ⅱ transaetivator(CII TA)and the different clinical phenotypes of chronic hepatitis B virus(HBV)infection.Methods Six hundred and twenty-seven patients with chronic HBV infection and 101 healthy blood donors were enrolled in this study.Genotyping of C19170G,C30799G in C Ⅱ TA gene coding region were done by sequence-specific primer polymerase chain reaction(PCR-SSP).Hardy-Weinberg balance of the genotypes was analyzed using chi-square test.Differences between two sets were tested by contingency table chi-square test and unconditional Logistic regression was performed. Results The frequencies of G allele and GG+GC genetypes at 19170 site were significantly higher in patients with liver cirrhosis than those with non-progressive liver diseases(X2=7.128,P=0.008;X2=6.404,P=0.011,respectively).There were significantly differences of the allele frequencies between patients with liver cirrhosis and non-progressive liver diseases(OR:0.742,95%CI:0.552～0.998,P=0.048),and the main differences were observed in G dominant model(OR:0.581,95% CI:0.353～0.954,P=0.032).The frequencies of C allele and CC genotype at 30799 site were significantly higher in patients with hepatocellular carcinoma than those in patients with liver cirrhosis(X2=4.861,P=0.027;X2=4.993,P=0.025).There were significant differences of the genotype frequencies at 30799 site between patients with liver cirrhosis and hepatocellular carcinoma(OR:0.557,95% CI:0.334～0.930,P=0.025),and the differences were mainly observed in C recessive model(OR:0.491,95% CI:0.269～0.898,P=0.021).Conclusions The polymorphisms at 19170 site are associated with liver cirrhosis in chronic HBV infection,and the G allele carriers are prone to progress into liver cirrhosis.The polymorphisms at 30799 site are associated with hepatocellular carcinoma in chronic HBV infection,and CC genotype carriers are prone to progress into hepatocellular carcinoma.

RAPD genetic analysis on etiological factor of mink self-biting disease / 生物工程学报

Self-biting is a chronic disease, which cause wound to take effect on mink growth and pelt quality. In this study, we firstly adopted RAPD (random amplification polymorphism DNA) technique based on the reproducible 26 polymorphism primers screened from 100 random primers to analyze hereditary constitution of the samples from healthy minks and self-biting minks, respectively, at molecular level to aim to discuss the causes of self-biting. The results showed that 29 straps showed polymorphism among amplified 105 straps, of which the polymorphism rate is 27.62%. Between healthy and sick mink groups, the amplified DNA fragment through different primers indicated different distribution frequency. The similarity coefficient of mink groups is 0.8471 and genetic distance (variation) index is 0.1529. Through primer S356 (whose sequence is CTGCTTAGGG), we amplified different straps between healthy and sick mink. The amplified 1000 bp DNA fragment in the sick mink groups can preliminarily serve as molecular genetic label to distinguish from healthy and sick mink groups to gradually remove the mink individual of self-biting, achieve to purify mink groups and reduce economy loss of mink breeding industry. This work provide theoretical basis for further study on molecular breeding and disease prevention of mink.

Direct generation of pluripotent stem cells from differentiated somatic cells / 生物工程学报

Embryonic stem (ES) cells have the unique capacity to proliferate extensively and maintain the potential to differentiate into advanced derivatives of all three primary germ layers. ES cell lines can also be generated from human blastocyst embryos and are considered promising donor sources for cell transplantation therapies for diseases such as juvenile diabetes, Parkinson's disease, and heart failure. However, as for organ transplants, tissue rejection remains a significant concern for ES cell transplantation. Another concern is the use of human embryos. One possible means to avoid these issues is by reprogramming the nuclei of differentiated cells to ES cell-like, pluripotent cells. This review discusses the potential of these strategies to generate tailor-made pluripotent stem cells and the role of transcription factors in the reprogramming process.

Role of MHC class Ⅱ transactivator in upregulating the expression of HLA class Ⅱ antigen in HepG2 cells / 第三军医大学学报

Objective To investigate the role of MHC class Ⅱ transactivator(CⅡTA) in upregulating the expression of HLA class Ⅱ antigen in HepG2 cells.Methods Eukaryotic expression vector EBS-NPL-CⅡTA containing CⅡTA cDNA or the empty vector EBS-NPL was transfected into HepG2 cells respectively.CⅡTA mRNA and HLA class Ⅱ antigen(HLA-DR,DP,DQ) were respectively detecued by RT-PCR,indirect cell immunofluorescence technique and flow cytometry in original HepG2 cells,HepG2 cells transfected with EBS-NPL-CⅡTA or the empty vector EBS-NPL.Results The expression of CⅡTA mRNA and HLA class Ⅱ antigen(HLA-DR,DP,DQ) were not observed in original HepG2 cells and HepG2 cells transfected with empty vector,but in the HepG2 cells transfected with EBS-NPL-CⅡTA.Conclusion CⅡTA is a switching factor of mastering the expression of HLA class Ⅱ antigen in HepG2 cells.The lack of CⅡTA expression in HepG2 cells contributes to no expression of HLAⅡ antigen.