Objective To evaluate the clinical significance of K-ras mutation in plasma cell-free DNA from patients with colorec-tal carcinoma .Methods Plasma cell-free DNA in 212 patients with colorectal carcinoma were extracted and identified by Globin gene .K-ras mutation was amplified by RE-PCR and compared with results of pathological biopsy samples DNA .Results Plasma cell-free DNA were successfully obtained from 212 cases .But no plasma cell-free DNA were found in normal control .Out of 212 ca-ses ,34 cases showed K-ras mutation(16 .00% )in cell-free DNA ,and 33 cases showed positive in pathological biopsy samples DNA (15 .57% ) .It was found two kinds of K-ras mutation on code 12-GGT to GAT ;GGT to GTT .K-ras mutation was not related to tumors′position(χ2 =3 .34 ,P=0 .61);to differentiation degree(χ2 =2 .38 ,P=0 .29);to Dukes staging(χ2 = 2 .84 ,P=0 .38);to lymphoid nodes′metastasis(χ2 =0 .98 ,P=0 .37);to age(χ2 =1 .86 ,P=0 .39) .Conclusion Tumor-derived DNA can be detected in plasma of underlying cancer patients .For colorectal carcinoma patients ,detecting K-ras mutation of plasma cell-free DNA have the same clinical significance as biopsy samples .Moreover ,it′s more convenient and non-invasive .

ThestudiesonthemaincomponentsinEucommiaulmoidesfromdomesticandabroadweresummarizedinthepaper, which can provide the reference for the effective component study and quality control of the Chinese herb.

Objective To preliminarily study effects of polysaccharide of Sijunzi Decoction (SD) on the function of intestinal mucosal humoral immune. Methods NIH mice were equally randomized into 4 groups:normal control group,model group,SD polysaccharide (SDPS) group,and SD free proteoglycan (SDFP) group. The intestinal sIgA content was detected by ELISA. The phynotype of Peyer's nodel cells was examined with flow cytometer. Immunohistochemistry was used to detect the expression of TLR4 receptor in the intestine. Results Compared to the normal control group,SDPS and SDFP group,the concentration of sIgA was significantly decreased in the model group (P

Objective National external quality assessment (EQA) results from 2005 to 2008 for HLA class Ⅰ (A, B) and class Ⅱ (DRB1) low-resolution DNA typing were summarized with the goal of exploring strategies to assure and improve HLA DNA typing performance in clinical testing. Methods HLA allele results from the four consecutive years EQA events were analysed. Different kinds of errors were described and classified, and the possible causes were discussed. Results Participant laboratories were increasing in the four consecutive years with the number of 22, 28, 47 and 61 in 2005, 2006, 2007 and 2008,respectively. 2 844 HLA DNA typings were returned from the participants during the 4 years EQA surveys, and overall 30 errors (1.05%) were identified. These 30 errors were classified into two major types of errors including 25 technical genotyping errors and 5 human errors. The proportion of laboratory participants which made mistakes was 13. 6%, 10. 7%, 10. 6% and 16.4% in 2005, 2006, 2007 and 2008, respectively. Conclusions Above 10% of participant laboratories exhibited errors in the four consecutive years HLA molecular typing EQA surveys. Relevant important attentions should be greatly paid to clinical HLA molecular typing test.

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.

BACKGROUND:In the clinical orthodontics, ceramic brackets have deficiencies in the aspects of antibacterial and mechanical properties, which easily lead to the emergence of a variety of adverse events and influence the orthodontic effect. OBJECTIVE:To observe the antibacterial and mechanical properties of nano silver hydroxyapatite coating ceramic brackets. METHODS:The nano silver hydroxyapatite coating ceramic brackets were prepared. Scanning electron microscopy was used to observe the coating surface. Coating antibacterial experiment was conducted. Totaly 50 in vitro human maxilary premolars were randomly divided into two groups (n=25 per group): experimental and control groups. Premolars in the experimental group were bonded to nano silver coating hydroxyapatite ceramic brackets, and premolars in the control group were bonded to ordinary ceramic brackets. The shear strength was detected in these two groups.RESULTS AND CONCLUSION: The overall structure of nano silver hydroxyapatite coating was order, uniform and compact. Hydroxyapatite had a porous structure with a micro-nanometer aperture and there were a large number of nano-silver particles uniformly distributed. Quantitative antibacterial experiments showed that nano silver hydroxyapatite coating ceramic brackets had a strong inhibition to Escherichia coli and Staphylococcus albus, with an antibacterial rate of more than 95%. The shear strength in the experimental group was lower than that of the control group (P < 0.05). These results demonstrate that the nano silver hydroxyapatite coating ceramic brackets have good antibacterial and mechanical properties, which meet the requirement of mechanical change in the clinical orthodontics.

Objective To imestigate the effect of total polysaccharides(TP) from Sijunzi Decoction(SD) on the immune function of mice intestinal intraepithelial lymphocytes(iIEL).Methods NIH mice were eaqually randomized to 4 groups:control group,model group,TP-SD group,free-protein polysaccharides from SD(FPP-SD) group.Mice iIEL was extracted by discontinuous density method.The percentage of CD3+ and CD69+ in iIEL were detected by flow cytometer.IL-2 and IFN-? expression in iIEL supernatant was detected by ELISA.Results The percentage of CD3+ lymphocyte in iIEL was 88.46 %.The percentage of CD69+ lymphocyte and the levels of IL-2 and IFN-? in iIEL were significantly decreased in the model group compared with those in the normal control group(P

Background and purpose:Liver is one of the most common metastatic sites in colorectal carcinoma,but there is no biomarker that could be used to predict and evaluate the possibility of metastases in the liver.Our study is aiming to investigate the relative parameters of liver metastasis of colorectal carcinoma after surgery.Methods:Several factors,including serum CEA level,lymph node metastasis,vessel and lymph vessel invasion,pathologic character of primary tumor,were used for analysis,the data was collected from either patients of colorectal carcinoma with(107 cases) and without(100 cases) hepatic metastasis in 2 years.All of the patients received surgery.Results:Patients with hepatic metastasis had significantly higher positive rates in terms of remote lymph node metastasis,vessel and lymph vessel invasion,respectively(P

Objective To describe the MR appearancses of growth-plate of the developmental long bones,and to study the correlativity of MRI with the anatomy and histology findings.Methods 40 pigs with normal knees were examined by 1.0 T scanning system with various orientations and sequences,MR imagings were compared with the results of sectional anatomy and histology.Results According to MRI,we divided the evolution of growth plate into four developmental stages;the earlier forming stage of growth plate(aged the 80～95 days of pregnancy),the forming stage(aged the 95 days of pregnancy-2 months),the maintaining stage (aged 2 months-3.5 years),the closing stage(aged 3.5～4.5 years).The MRI manifestations of growth plate of knees reflected the findings of sectional anatomy perfectly and histology to a certain extent in each developmental stage.Conclusion MRI is very useful and helpful in dividing the developmental stages of growth-plate,guessing the foundation of anatomy and histology,diagnosing and differentiating all kinds of growth plate lesions.

Objective:To establish a determination method for loganin in Tiaojing Zhuyun granules by HPLC. Methods: HPLC was used with a SinoChrom ODS-BP (250 mm × 4. 6 mm,5μm) as the analytical column. The mobile phase was composed of acetoni-trile-0. 1% phosphoric acid solution(14∶86). The detection wavelength was set at 240 nm and the column temperature was 30℃. Re-sults:The calibration curve of loganin was in a good linearity over the range of 50. 40-1 008. 00 ng(r=0. 999 9). The average recov-ery was 99. 33%(RSD=1. 41%, n=6). Conclusion:The method is simple,feasible and reproducible,and can be used in the quality control of Tiaojing Zhuyun granules.