Objective To explore the association of the inherent cellular level of reactive oxygen species (ROS) with the sensitivity of the gastric and esophageal carcinoma cells to arsenic trioxide (As 2O 3). Methods The difference of sensitivity to apoptosis induction by low concentration (2 ?mol/L) of As 2O 3 between the gastric carcinoma cell line SGC7901 and MKN45, and between the esophageal carcinoma cell line EC/CUHK1 and EC1867 was firstly demonstrated. SGC7901 was more sensitive than MKN45, and EC/CUHK1 more sensitive than EC1867 to As 2O 3. Then dihydrogenrhodamine 123 (DHR123), as a ROS capture, was incubated with the cells in the absence of As 2O 3. The fluorescent intensity of rhodamine 123, the product of cellular oxidation of DHR 123, was assayed by flow cytometry. The ROS levels was thus detected. Results Inherent cellular ROS level is higher in SGC7901 and EC/CUHK1. They are more sensitive to As 2O 3, than the corresponding cell line MKN45 and EC1867. Conclusions The difference in inherent cellular ROS level of gastric and esophageal carcinoma cells is associated with the cellular sensitivity to apoptosis induced by As2O 3.

Objective To improve the understanding of medical literature databases in order to correctly select and use them. Methods The use of 4 common medical literature databases in China was comparatively analyzed. Re-sults Repetitive and incomplete literature coverage, imperfect key retrieval techniques, insufficient retrieval func-tions, loose design, and unscientific retrieval systems were the major problems of the 4 commonly used Chinese medical literature databases. Conclusion The user should know the weak points of different databases and selectively use them. Standardization and quality control of medical literature databases should be further improved.

Purpose:To explore the association of the inherent cellular level of reactive oxygen species (ROS) with the susceptibility of the tumor cells to apoptosis induced by arsenic trioxide (As 2O 3). Methods:Low concentration(2 ?mol/L) of As 2O 3 was administrated to a pair of the leukemic cell lines, NB4 versus U937, and a pair of the esophageal carcinoma cell line, EC/CUHK1 versus EC1867, to confirm the difference in their susceptibility to apoptosis induced by As 2O 3. Dihydrogenrhodamine123 (DHR123), used as a ROS capture, was incubated with the cells in the absence of As 2O 3 administration. The fluorescent intensity of rhodamine123, which was the product of cellular oxidation of DHR123, was detected by flow cytometry, and ROS was thus measured. Results:For apoptosis induction by 2 ?mol/L of As 2O 3 ,NB4 was more sensitive than U937,and EC/CUHK1 more sensitive than EC1867. The inherent cellular ROS level was higher in NB4 than in U937, and also higher in EC/CUHK1 than in EC1867. Conclusions:The difference in cellular ROS level is associated with the cellular susceptibility to apoptosis induction by As 2O 3.

Objective To investigate the level and influencing factors of stigma among patients with lung cancer, in order to provide evidence for staff nurses to take pertinent interventions for assisting patients to deal with stigma. Methods Totally 234 hospitalized patients with lung cancer were cross-sectional survey with General Demographic Questionnaire, Disease Information Questionnaire, Chinese version of Cataldo Lung Cancer Stigma Scale (CLCSS-CV). Results The total score of stigma was (72.35±10.85) points. The total scale score and each subscale score was divided by the item number. The mean score of CLCSS-CV was (2.68±0.40) points, the rate of the patients with lung cancer with moderate above stigma was 51.20% (120/234). The patients rated higher scores on the subscales of smoking (2.90±0.58) points, while lower scores on the subscales of discrimination (2.47 ±0.55) points. Multiple stepwise regression analysis showed that the number of children and the clinical stages were influencing factors of lung cancer stigma, where regression coefficients were -0.065, 0.136 respectively, coefficients of determination was 0.178. Conclusions Patients with lung cancer have a moderate or higher level of stigma. The medical staff should communicate with patients, evaluate the psychological status, impose public health education, mobilize the social support for assisting them to deal with stigma.

Objective To construct a eukaryotic expression system of IFN-λ,examine the expression of IFN-λand evaluate its bio-functions including anti-proliferation and anti-viral activity.Methods The genes of human IFN-λ1 /2 (hIFN-λ1 /2)were cloned from the mRNA of poly I∶C treated HuH-7 cells.The PCR product was examined with DNA sequencing.The genes of IFN-λ1 /2 were sub-cloned into pcDNA3 vector.The correct insertion of the gene IFN-λ1 /2 was identified with enzyme digestion.The constructed pcDNA3-IFN-λ1 /2 plasmids were transfected into COS-7 cells and IFN-λ1 /2 protein was checked in the supernatant and lysis of transfected cells using Western blotting analysis.The human esophageal carcinoma YES5 and T.Tn cells were treated with the IFN-λ1 /2 from the transfected cells and the proliferation of carcinoma cells were measured with CCK-8 kit.In the treated carcinoma cells,the apoptosis and antivirus related molecules such as caspase-3,ISG15 and MxA was analyzed with Western blotting or Quantitative real time PCR.Results The sequence of hIFN-λ1 /2 fragment matched that of the gene bank and the gene of the cytokines was inserted into pcDNA3 vector correctly.With Western blotting analysis,IFN-λ1 /2 protein was detected in the pcDNA3-IFN-λ1 /2 transfected COS-7 cells.The IFN-λ1 /2 from the transfected COS-7 cells inhibited the growth of YES5 and T.Tn cells, activated apoptosis related caspase-3,and up-regulated the anti-virus gene expression of ISG15 and MxA.Conclusion COS-7 cells can express IFN-λ1 /2 after transfection with pcDNA3-IFN-λ1 /2,suggesting that eukaryotic expression system of IFN-λis established.IFN-λ1 /2 from the system can perform bio-functions,such as proliferation inhibition,apoptosis induction and anti-viral gene up-regulation,which indicates that the system can contribute to further investigations of IFN-λbio-activity and its clinical application.

Objective To explore the effect of cerium nitrate on activity of the enzyme related to energy metabolism,cell cycle and apoptosis of testiculus cell in male mice.Methods A total of 100 male mice were distributed randomly into negative control group,cytoxan group,cerium nitrate groups in low dose(15mg/kg),medium dose(30mg/kg),high dose(60mg/kg).Whole mice were given corresponding reagent for 60 days.Enzyme-chemical method was used to detect the activity of lactate dehydrogenase(LDH),sorbitol dehydrogenase(SODH),succinic dehydrogenase(SDH),glucose-6-phosphate dehydrogenase(G-6PD).Cell cycle and apoptosis of testiculus cell were studied by the way of one-fluorescence dying method on flow cytometer.Results 15mg/kg cerium nitrate could promote the activity of LDH,SODH,SDH and G-6PD of testiculus cell compared with that of cytoxan(P

Abnormal activation of Wnt signaling pathway is closely related to the occurrence of tumor, and T cell factor 4 (Tcf4 ) and beta-catenin are important signal transmission factors of this pathway. The aim of the present study is to explore the significance and correlation between expression of Tcf4, beta-catenin and secreted frizzled related protein 1(SFRP1), suppressor gene of Wnt signaling pathway, in colorectal carcinoma and their correlations to the clinicopathological factors. The expressions of Tcf4, beta-catenin and SFRP1 were performed with immunohistochemistry staining in 97 cases of primary colorectal carcinoma and 40 cases of normal colorectal mucosa tissues. The results showed that the abnormal expression rates of Tcf4 and beta-catenin in colorectal carcinoma were significantly higher than those in the control groups (P<0.01). The positive rate of SFRP1 was significantly lower than those in the control groups (P<0.01). The abnormal expression rates of Tcf4 and beta-catenin were also related to the lymph node metastasis and Dukes stage (P<0.05). A significant correlation was found between the expressions of SFRP1 and Tcf4, beta-catenin (P<0.05). Overexpression of Tcf4 and beta-catenin was related to poor prognosis (P<0.05). But the survival rates of the group with SFRP1 expressions were higher than those in group without SFRP1 expressions (P<0.05). Cox multifactor regression analysis indicated that Dukes stage, expression of beta-catenin and SFRP1 were independent risk factors of colorectal carcinoma (P<0.05). The results suggested that the abnormal expression of Tcf4 and beta-catenin in colorectal cancer may be related to the reduced or absent expression of SFRP1. beta-catenin accumulation in the nuclei formed complexes with Tcf4 is one of the important molecular switch maintaining colorectal malignant phenotype. The combined detection of these indexes may perform an important role in predicting the progression and prognosis of colorectal cancer, and could provide new molecular targets for gene treatment of colorectal cancer.
Carcinoma ; metabolism ; Colorectal Neoplasms ; metabolism ; Disease Progression ; Humans ; Intercellular Signaling Peptides and Proteins ; metabolism ; Lymphatic Metastasis ; Membrane Proteins ; metabolism ; Phenotype ; Prognosis ; Risk Factors ; Transcription Factor 7-Like 2 Protein ; metabolism ; Wnt Signaling Pathway ; beta Catenin ; metabolism

Objective To construct a luciferase reporter gene vector of perforin promoter and methylate it in vitro. Methods The promoter of the human peffofin was amplified by PCR, cloned into pMD18-T vector and subcloned into pGL3-Basie vector, and then con-finned by restriction mapping and DNA sequencing. The regions of interest were excised with the appropriate restriction endonucleases, then it were methylated with methylase Sss I(M. SssI)and S-adenosymethioine(SAM), and methylation was confirmed by digestion with appropri-ate methylation sensitive enzyme AciI and agrose gel electrophoresis, and then the fragment was relegated back into the promoter-reporter constructor pGL3-Basic. Results The result of DNA sequencing showed that the sequence of cloned promoter was right. The result of diges-tion methylation with appropriate methylation sensitive enzyme showed that perforin promoter was completely methylated. Conclusion The promoter of perforin was successfully cloned and completely methylated in vitro, which provided an important basis for the study of transfec-tion.

OBJECTIVETo investigate whether ascorbic acid could enhance the efficacy of arsenic trioxide (As(2)O(3)) combined with 2, 3-dimethoxy-1, 4-naphthoquinone (DMNQ) in inducing the apoptosis of leukemia cell line U937 and its possible mechanism.

METHODSFlow cytometry and electron microscopy were applied to detect apoptosis of U937 cells after treatment with various combinations of As(2)O(3), DMNQ and ascorbic acid for 24 hours.

RESULTSAs(2)O(3) and DMNQ induced-apoptosis of U937 cells was enhanced (35.24%-->61.20%) upon cotreatment with ascorbic acid. Catalase could reverse this effect of DMNQ. Ascorbic acid had no effect on DMNQ-induced apoptosis of U937 cells.

CONCLUSIONAscorbic acid enhanced the apoptosis of U937 cells via reactive oxygen species-dependent pathway in the presence of As(2)O(3).

Apoptosis ; drug effects ; Arsenicals ; pharmacology ; Ascorbic Acid ; pharmacology ; Drug Synergism ; Flow Cytometry ; Humans ; Naphthoquinones ; pharmacology ; Oxides ; pharmacology ; U937 Cells

Dermatomyofibroma is a benign and rare proliferation of myofibroblasts and fibroblasts of the skin.Dermatomyofibroma commonly locates at the shoulder and neck of young adults and adolescents.Other frequently affected anatomic sites are upper arms,thigh,chest wall,back,axillary region and abdomen.Herein,we reported a case of dermatomyofibroma occurred in the nasion.The asymptomatic firm nodule and histopathological features were consistent with dermatomyofibroma.Immunohistochemically,the tumor cells expressed vimentin,HHF35 and α-smooth muscle actin (α-SMA).The patient was followed up for 2 years after excision of the tumors and recurrences were not observed.