Objective To observe the effect of RNAi that silences MTA1 gene on invasion and migration of esophageal carcinoma 9706 cells. Methods The siRNA expression vector that silences MTA1 gene was transfected into EC9706 cells by liposome. MTA1 mRNA and protein expressions were detected through quantitative RT-PCR and Western blot, respectively. The invasion and migration of EC9706 cells were evaluated by scrape wound healing assay and cell invasion assay in vitro. Results MTA1 gene expression significantly decreased. The scrape wound of EC9706 cells healed more slowly and the cell population that cut through Matrigel were less in the EC9706 cells transfected with siRNA expression vector than non-transfected EC9706 cells and the EC9706 cells transfected with blank vector (P

This study is to screen the Chinese herbal compounds which could inhibit the production of Abeta and investigate the underlying mechanism. Ten types of compounds which have potential value in the treatment of AD were selected as initial screening trial. The cell models which used could overexpress Abeta and beta-secretases or Abeta and gamma-secretases. Extracellular Abeta was determined by ELISA after the cell models treated with different concentrations of compounds (0.5-100 micromol x L(-1)), separately. Then the compounds were selected which could inhibit extracellular Abeta and their best concentration ranges were decided, too. Furthermore, the cell viability and apoptosis rate, the level of intracellular Abeta, beta and gamma-secretases were determined after the cell models treated with different concentrations of selected compounds. The results showed that 4 of the 10 compounds could reduce the level of extracellular Abeta; they were cryptotanshinone, astragalosides, gastrodin and paeoniflorin, and their best concentration ranges were 0.5-5.0, 0.5-5.0, 5.0-50, 1.0-25 micromol x L(-1), respectively. Further study indicated that the 4 selected compounds were nontoxic to the cellular models and lowering intracellular Abeta were more effective compared with extracellular; of which astragalosides and gastrodin showed dose-dependent inhibition to the activities of beta and gamma-secretases, with the maximum inhibiting rates of 78.2% and 80.3%, respectively. In conclusion, cryptotanshinone, astragalosides, gastrodin and paeoniflorin could inhibit the expression and secretion of Abeta, and the underlying inhibiting mechanism of astragalosides and gastrodin were related with the reduction of the beta and gamma-secretase activities, respectively.

Objective To compare the clinic significance of four clinical scoring systems in evaluating prognosis of acute pancreatitis: bedside index for severity in acute pancreatitis(BISAP), acute physiology and chronic health evaluation (APACHEⅡ), Ranson’s scoring system, computed tomography severity index (CTSI) in AP. Methods Patients visited our clinic with AP (n=114) in recent 2 years were retrospectively analyzed. BISAP and APACHEⅡscores were obtained at 24 hours after admission; Ranson ’s score was obtained at 48 hours after admission and CTSI are obtained was obtained at 72 hours after admission. Results of four scoring system were compared under different causes and different severity of the dis?ease. Correlation between BISAP score and the other three scores were analyzed and the predicative value of all four scoring systems for severity of AP and death were also compared. Results The mean values of four scoring systems show no signifi?cant difference in AP patients with different etiology (P>0.05). The BISAP score is positively correlated with APACHE-Ⅱ, Ranson ’s score and CTSI score (P<0.01). The four scoring systems all present good predictive value on the severity of AP and death (P<0.01). Conclusion The four scoring systems can all be applied to grading and prognosis for AP of various causes. BISAP is a simple, prompt, economical scoring system in clinical practice.

Objective To explore the double-labeling method of monitoring the GHRP regulatory function on [Ca2+]i and NO in cardiomyocytes of rats on real time under LSCM.Methods The reformed constant-flow Langendorff system and enzyme-dissociated was used to isolate cardiomyocytes.[Ca2+]i and NO in the cardiomyocytes of SD rats were double-labeled by their molecular probe Rhod-2/AM and DAF-FM/DA,respectively to monitor the regulatory function of GHRP on [Ca2+]i and NO on real time by LSCM.Results Ca2+ signal showed a red fluorescence and NO showed a green fluorescence while the overlapping of the two signals showed a yellow-green fluorescence by this system,and the similar effect presents in both double-labeled state and the single labeled one:GHRP induced a transient[Ca2+]i increase then followed by a plateau phase while there was not significant change in NO signal system after GHRP stimulation under the LSCM in the cardiomyocytes of rats.Conclusions After having established the double-labeling method we monitored the GHRP regulatory function on [Ca2+]i and NO on real time in cardiomyocytes of rats under LSCM causing the [Ca2+]i biphasic increase while no significant change in NO signal system.

Objective To investigate the differentially expressed genes of primary esophageal squamous cell carci-noma and of normal esophageal mucosa. Methods LCM-GMA-cDNA microarray was used to detect the mRNA from both the primary carcinoma and the corresponding esophageal epithelium in 15 cases of human esophageal squamous cell carcinoma (ESCC). After high-stringent washing, the cDNA microarray was scanned for the fluores-cent signals. Results Among the 886 target genes, 34 genes had significant difference in Ⅰ / Ⅱ and Ⅲ/Ⅳ group. Cell cycle regulators possibly promoting the growth of tumor cells were highly expressed in the early stages of ESCC, whereas adhesion molecules and extracellular matrix-related molecules possibly promoting invasiveness increased in the later stages. Conclusion More than one gene contributed to esophageal cancer. The profiles of gene expression will bring us chance to understanding the molecular mechanism of tumor progression and to support clinical treat-ment.

Objective To discuss the feasibility on building lewis lung carcinoma mouse models through different methods and improve the methods. Methods The method of culture LLC cells in vitro, trypsin digestion method, Ⅳ collagenase method and homogenate method were compared to make the different dose of cell suspension injected into C57BL/6 mice. The feasibility of the improved method was determined through observing the cell count, the tumor formation ratio, the tumor formation time, tumor volume, weight and life habit. Results The method of culture LLC cells in vitro could get needed cells and its tumor formation ratio was 100 %. Trypsin digestion method and homogenate method could get less cells and its tumor formation ratio was about 80 %～90 % and 60 %～75 %. Whereas 1V collagenase method could get most cell count and its tumor formation ratio was 100 %. Conclusion IV collagenase method is a preferred method which is simple,high efficiency and make a strong base on the cancer experimental study.

AIM:To study the effect of p21-activated protein kinase 2 (PAK2) knockdown by RNA interfer-ence on the proliferation and apoptosis of human breast cancer cells .METHODS:The short hairpin RNA ( shRNA) targe-ting PAK2 gene was designed and used for packing lentivirus in 293T cells.Human breast cancer MCF-7 cells were infected by the virus particles and PAK2 knockdown stable cell line was established by puromycin selection .The knockdown effi-ciency was assessed by Western blotting .The proliferation ability of MCF-7 cells was evaluated by CellTiter 96 AQueous and anchorage-independent growth assays .The cell apoptosis induced by staurosporine was detected by flow cytometry . RESULTS:The protein level of PAK2 was significantly suppressed after silencing of PAK2 gene in MCF-7 cells ( P<0.01).Furthermore, knockdown of PAK2 caused remarkable inhibition of the cell proliferation and colony formation (P<0.01).Staurosporine induced more apoptosis in the PAK2 knockdown cells compared with the control cells (P<0.01). CONCLUSION:Knockdown of PAK2 inhibits the proliferation of MCF-7 cells and increases the sensitivity of chemothera-peutic drug-induced cell apoptosis , suggesting that PAK2 might be a new therapeutic target in breast cancer treatment .

Objective To study the effects of Alternariol(AOH) on DNA polymerase ?(DNA POL?)expression in NIH3T3 cells.Methods RT-PCR,Immunocytochemistry and Western blot were used to detected mRNA and the protein levels of DNA POL? in NIH3T3 cell line induced by AOH.Results The expression of DNA POL? in NIH3T3 cells contaminated by AOH was significantly higher than that in the control group(P

Objective To study the effect of gene engineering adenovirus H101 for treating esophagus carcinoma EC9706 induced by CEA gene specific silencing and to explore internal influential factor of H101 sensitivity. Methods To construct the siRNA expression vector of CEA and to inhibit the expression of CEA through RNA interference and gene transfection in EC9706 cell,stable CEA gene silencing system was set up,compared with empty vector group and non-transfected EC9706 cell,the model of athymic mouse subcutaneous transplantation tumor of human esophagus carcinoma EC9706 cell was established followed by injection with H101. The mRNA and protein expressions of CEA were detected by real time PCR and immunohistochemistry,the tumor size was measured. Results Silencing CEA gene by applying RNAi can inhibit CEA mRNA and protein expression in nude mice model with transplanted human esophageal cancer cells,there was no evident influence on tumor growth and mass oftumor. After using H101,the tumor size of interfering group was much smaller than that of empty vector group and normal control group(P

Objective To establish a novel method by integrating immunomagnetic bead enrich-ment with immunochromatography for the detection of influenza A virus. Methods The immunomagnetic beads were prepared by using EDC/NHS method and then coupled with monoclonal antibodies against influ-enza A virus. A direct immunomagnetic beads-based immunochromatography for the detection of influenza A virus was developed by using double-antibody sandwich method and immunochromatography, which was fur-ther combined with immunomagnetic separation to establish the novel integrated method of immunomagnectic bead enrichment and immunochromatography. Clinical throat swab samples collected from patients with influ-enza A virus infection and healthy subjects were analyzed by the novel method and the results were compared with those by using the conventional colloidal gold immunochromatography to evaluate the specificity, sensi-tivity and positive coincidence rate of this established method. Results The direct immunomagnetic beads-based immunochromatography and the colloidal gold immunochromatography showed no significant differences in specificity and sensitivity and could be used to identify influenza A virus-positive samples with cycle threshold ( Ct) values less than or equal to 22 obtained by real-time PCR assay. The integrated method could identify positive samples with Ct values less than or equal to 28, indicating that the novel method was more sensitive. Conclusion The novel method by integrating immunomagnetic bead enrichment with immunochroma-tography was successfully established and suitable for the rapid and on-site detection of influenza A virus.