Objective:To study the mechanism of protein kinase C regulating CD44 gene expression in vascular endothelial cells.Methods:Human umbilical vein endothelial cells (HUVECs)were taken as study model.The extract of Raf-1 kinase by immunoprecipitation was used for the Western blot analysis,and its activity was determined by enhanced chemiluminescene assay.CD44 gene expression was detected with RT-PCR,and phosphorylation was measurated by autoradiography.Results:CD44 phosphorylation in HUVECs was enhanced by 10ng/ml PMA treatment as compared with untreated cells, which reached the highest level at 30 minutes. Raf-1 kinase activity increased significantly after exposure to 10ng /ml PMA, and 0.05 ?mol/L Calphostinc could inhibit the role of Protein kinase C(PKC). CD44 gene expression level increased obviously after exposure to 10 ng /ml PMA (PKC activator) for only 1 minute(P

BACKGROUND: Chronic myeloid leukemia (CML) is characterized by the clonal expansion of hematopoietic stem cells. Without effective treat ment, individuals in the indolent, chronic phase (CP) of CML will undergo blast crisis (BC), the prognosis for which is poor. Therefore, it is important to clarify the mechanism underlying CML from a whole-genome perspec tive. OBJECTIVE: To investigate the gene expression profile of bone marrow mononuclear cells from CML with Applied Biosystems Expression Array System.DESIGN: Observation and controlled analysis.SETTING: Institute of Gene Engineering, Southern Medical University PARTICIPANTS: Samples of two cases of bone marrow (a chronic myeloid leukemia patient and a healthy person).METHODS: This experiment was conducted at the Institute of Gene Engineering, Southern Medical University from October 2004 to September 2005.The total RNAs were extracted and purified from bone marrow mononuclear cells derived from a CML patient and a healthy person. mRNAs were purified using an oligo (dT)-cellulose mRNA purification kits and labeled using reverse transcription, in vitro transcription (RT-IVT), then hybridized with microarray. Gene expression differentiation of the bone marrow mononuclear cells were examined by ABI 1700 Chemiluminescent Microarray Analyzer. Reproducibility of microarray results was assessed by comparing data sets obtained from the same sample and analyzed by two different arrays.MAIN OUTCOME MEASURES: ①Assessment of quality of total RNA and labled cRNA. ②Reproducibility of microarray. ③ Hybridization of array.④Results of semi-quantitative reverse transcription-polymerase chain reaction RESULTS: ①Using statistical data analysis tools, we identified 6 706 genes that were up- or down-regulated in CML patient compared with the healthy person. In these genes, we found that 17 genes were up-regulated while 51 genes were down-regulated among 68 genes closely related to CML. ②most differentially expressed genes in C/EBPalpha mediated path way and CD40L signaling pathway had reduced expression. ③Good repro ducibility of microarray was confirmed by analysis of correlation and detection concordance in technical replicates. The correlation coefficient of the detectable probe in technical replicates was 0.991 for the CML patient and 0.988 for the healthy person. ④The results of semi-quantitative RT-PCR experiments supported the reliability of our microarray analysis.CONCLUSION: By comparing expression patterns of CML with those of the healthy person, we identified a large number of genes that, were up- or down-regulated in CML patients. These data should provide useful information for finding candidate genes whose products might serve as molecular targets for treatment of CML patients.

[Objective] To observe the effect of Jiedu Lifei Oral Liquid (JLOL, mainly composed of Flos Lonicerae,Fructus Forsythiae, Radix Scutellariae, Bulbus Frityllariae, etc. ) on the immune function in mice with viral pniumonia.[Methods] Sixty mice were randomized into 5 groups: normal group (A), model group (B), virazole group (C), small-dose JLOL group (D) and large-dose JLOL group (E). Mouse models of viral pheumonia were induced by infection ofinfluenza virus FM1. Effects of JLOL on serum levels of interleukin-1 (IL-1), interleukin-2 (IL-2), tumor necrosisfactor ? (TNF-?) and interferon ? (IFN-?) were observed. [Results] Compared with normal group, serum levels of IL-1 and (IFN-? were decreased and TNF-? increased (P 0.05 ) in model group.After treatment wth JLOL, serum levels of IL-2 and IFN-? were increased , TNF-? decreased (P 0.05). [ Conclusion] JLOL can increase the immune function by increasing the serumlevels of IL2 and IFN-? and can reduce the immune impairment by inhibiting the over production of TNF-?.

Adolescent ; Adult ; Aged ; Amino Acid Motifs ; Antiviral Agents ; therapeutic use ; Female ; Gene Products, pol ; genetics ; Hepatitis B virus ; genetics ; Hepatitis B, Chronic ; drug therapy ; virology ; Humans ; Lamivudine ; therapeutic use ; Male ; Middle Aged ; Mutation

Objective The rapid multiplex PCR (MPCR) system for detection of genes encoding aminoglycoside resistance in Staphylococcus aureus was developed. The distribution of antibiotic resistant genes acc(6')-Ie+aph(2″), aph(3')-Ⅲa and ant(4')-Ia in Guangzhou was analyzed using the established system.Methods S. aureus strains were identified and susceptibility tests were performed using VITEK-60 or PHOENIX-100 system as recommended by the manufacturer. Aminoglycoside resistance was determined by disk diffusion method. MPCR system for detection of antibiotic resistance genes was optimized.Results The MPCR assay was established successfully. The prevalence of acc(6')-Ie+aph(2″), aph(3')-Ⅲa and ant(4')-Ia in the 124 clinical S. aureus isolates was 62.1%, 32.3% and 1.6%, respectively as analyzed by MPCR. Good correlation between antibiotic resistance phenotypes and genotypes was observed. One or more of the genes encoding aminoglycoside modifying enzymes could be detected in all gentamicin- or netilmicin- or amikacin-resistant isolates. The acc(6')-Ie+aph(2″) gene was identified in 72 of 74 mecA-positive isolates.Conclusions This MPCR system could be used for rapid and reliable analysis of the antibiotic-resistant genotypes of clinical S. aureus isolates. The gene acc(6')-Ie+aph(2″) may be the predominant determinant of aminoglycoside resistance, followed by gene aph(3')-Ⅲa. The prevalence of ant(4')-Ia gene is relatively low.

Objective To investigate the correlation of trace elements in maternal blood,breast milk and infant blood.Methods Atomic absorption spectrographic method was used to measure blood and milk trace elements [calcium (Ca),ferrum (Fe),zinc (Zn),magnesium (Mg),copper(Cu)] of maternal of natural delivery and infant in 250 cases,then to analyze the correlation of trace elements in maternal blood,breast milk and infant blood in postpartum 42 days.Results There were statistically significant differences in trace elements between the maternal blood,breast milk and infant blood (P ＜ 0.05).There was a positive correlation of Ca,and Fe between maternal blood and infant blood [Ca (r =0.221,P =0.047),Fe (r =0.107,P =0.043)];Fe had a positive correlation between breast milk and infant blood (r =0.139 P =0.035);There was a positive correlation of the trace elements between maternal blood and milk,but no correlation in Mg.Conclusions There was the gradient of trace elements in maternal blood and breast milk in postpartum 42 days.It can keep breast milk in a certain percentage of trace element and contribute to absorption of trace elements and growth and development in infant.The regular determination of trace elements during pregnancy and postpartum in women and their infant can direct a balanced diet and advocate breastfeeding.It can also prevent the lack of calcium,iron,zinc and other trace elements in infant.

Objective To investigate the change in distribution and antimicrobial resistance of pathogens from blood culture of children,and provide a basis for treatment of bloodstream infection.Methods Pathogens isolated from blood culture of hospitalized children between January 2009 and December 2013 were divided into group 2009-2011 and 2012-2013.Distribution and antimicrobial susceptibility of pathogens were analyzed.Results From 2009 to 2013,a total of 48 455 blood specimens were taken for culture,2 730 pathogenic bacteria were isolated,positive rate was 5.63%.The positive rate of blood culture decreased year-by-year (χ2 =415.30,P <0.01 ).Of 2 730 iso-lates of pathogenic bacteria,gram-positive bacteria,gram-negative bacteria,and fungi accounted for 80.37% (n =2 194),18.68%(n=510),and 0.95%(n=26)respectively.The difference between two groups of pathogenic bacte-ria was significant(χ2 =180.334,P <0.001).Susceptibility rates of gram-positive cocci to vancomycin,linezolid and teicoplanin were all 100%,resistance rates of coagulase-negative Staphylococcus and Staphylococcus aureus to cip-rofloxacin,compound sulfamethoxazole and tetracycline all decreased.Susceptibility rates of gram-negative bacilli to imipenem,meropenem and amikacin were all≥97.50%,susceptibility rate of Klebsiella pneumoniae to levofloxacin was 100%;Of cephalosporins,Escherichia coli and Klebsiella pneumoniae had high resistance except ceftazidime and cefepime.Conclusion Distribution of pathogens from blood culture of children in 2009-2013 changed signifi-cantly,pathogens have high resistance to commonly used antimicrobial agents,more attention should be paid to the monitor of pathogens from blood culture and pathogenic antimicrobial resistance.

Objective To compare the difference of procalcitonin (PCT)level between serum and plasma in children so as to in-vestigate whether ethylenediamine tetraacetic acid dipotassium (EDTA-K2 )anti-coagulation plasma could replace serum to be an al-ternative material for PCT testing.Methods The PCT concentrations in the serum and EDTA-K2 anti-coagulation plasma from 90 children patients were detected by using the mini-VIDS-GB automatic enzyme linked fluorescence analyzer and the plasma PCT au-tomatic quantitative detection method.The correlation between the two sets of data was analyzed.And the data were assigned into the 3-level groups for conducting statistic analysis.At the same time the influence of child′s age and gender on the PCT level was al-so discussed.Results The PCT level in serum was well correlated with that in EDTA-K2 anti-coagulation plasma (r=0.812,P <0.05).There were no statistically significant differences in PCT levels between serum and plasma measured in the low level groups (P >0.05).However,the differences of the PCT levels between serum and EDTA-K2 anti-coagulation plasma in the middle level group and high level group were statistically significant (P <0.05).Child′s gender and age have significant effect on the PCT level. Conclusion There is statistically significant difference between serum and plasma PCT detection levels in children,which has an important guiding role for further systematic study of PCT level difference in serum and EDTA-K2 anticoagulation plasma and its clinical significance.

Objective To investigate the effect of nutrition intervention on psychological stress combining with sleep deprivation in rats. Methods Seventy-five male SD rats were randomly divided into five groups:control group,composite factor group,composite factor control group,nutrition group Ⅰ and nutrition group Ⅱ. The rat model of 14d psychological stress combining with 48h sleep deprivation was established by Communication Box and improved small platform methods. Rats in the 2 nutrition groups were gavaged with corresponding nutriment everyday; those in other groups were treated with gavage of physiological saline. Morris water maze place navigation test was employed to train rats and measure the ability of rats' spatial working memory. The antioxygenic potential of rats' blood serum and some nutrients were measured with corresponding kits. Results Compared with the composite factor group,the escape latency of all quadrants shortened significantly (P

The purpose of this article is to discuss the ethical and psychological issues of surrogacy. A lot of psychological issues will arise as a result of the many complicated and controversial difficulties in law， science， morality and public policy， and therefore a study of the ethical and psychological issues of surrogacy will contribute to a better understanding and management of these issues.