DNA Damage ; drug effects ; Formaldehyde ; toxicity ; Mutagenicity Tests

Aim To investigate the effect of selective cyclooxygenase-2 inhibitor, NS-398, on cell apoptosis in leukemia cell line K562 cells and its underlying mechanism. Methods Apoptotic cell percentage was examined by flow cytometry(FCM). The protein expression of Bcl-2 and Caspase-3 was detected by Western blot, and the activity of Caspase-3 was checked by FCM. Results NS-398 induced the cell apoptosis in K562 cells in a dose-dependent manner. After NS-398 treatment, the expression of Bcl-2 protein was downregulated, whereas the expression of Caspase-3 protein was upregulated. Moreover,the activity of Caspase-3 was increased in a dose-dependent way after NS-398 treatment. Conclusion Selective cyclooxygenase-2 inhibitor,NS-398,significantly induced apoptosis in K562 cells. The underlying mechanism might be related to the downregulation of Bcl-2 and the activation of Caspase-3.

AIM: To isolate and culture endothelial progenitor cells (EPCs) in blood vessel by in vitro amplification from bone marrow of rabbits to provide cytology basis for the implantation of autologous EPCs in the repair of blood vessel endothelium. METHODS: The experiment was performed at the Department of Cardiology, Changzheng Hospital, Second Military Medical University of Chinese PLA from March 2005 to February 2006. ①Dil labeled acetylated low density lipoprotein, FITC labeled BS-1 lectin, mouse anti-human CD34 antibody, rabbit anti-human FIK-1 antibody, mouse anti-human CD133 monoclonal antibody were purchased from molecular probes company, vector company, Biolegend company, Biolegeng company and R&D company. ②Totally 8 New Zealand rabbits were selected to extract the bone barrow. Mononuclear cell was isolated from bone marrow by density centrifugation. With the inoculated density of 1?106/cm2, it was put in the M199 medium containing vascular endothelial growth factor and Basic fibroblast growth factor (bFGF) for in vitro cultivation for 7 days. Cell growth and reproductive activity were observed. ③EPCs were identified by Dil labeled acetylated low density lipoprotein and FITC labeled BS-1 lectin. The cells showed red fluorescence were cells phagocytized acetylated low density lipoprotein, while those with green gluorescence were cells bind with BS-1, and the cells double stained showed orange fluorescence. ④Expressions of CD133, CD34 and Flk-1 were detected with immunofluorescent staining and flow cytometry. RESULTS: ①Observation of cell morphous: New isolated mononuclear cells were round. After cultivation for 72 hours, adherent cells showed colony-like growth, and the cells were round or irregular, and the caryocinesis was relatively obvious. Till the 7th day after cultivation, cell colony was connected each other, showing fusiform endothelioid cells. ②Reproductive activity of EPCs in blood vessel: At days 2-4, the reproduction of EPCs was rapid, and then became slow gradually. Growth curve showed typical "S" shape. At days 6 and 7, the EPCs grew rapidly. The absorbance (A) reached 0.58?0.15 and 0.62?0.23, respectively. ③Result of EPCs identification by Dil labeled acetylated low density lipoprotein and FITC labeled BS-1 lectin: In kytoplasm of EPCs, red fluorescent concentration bind with acetylated low density lipoprotein appeared, with the positive rate of over 95%. Combined rate with BS-1 lectin reached 100% nearly. Double staining rate reached over 90%. ④Result of EPCs immunohistochemical method and flow cytometry: The cell-surface marker CD133, FlK-1 and CD34 were positive. CONCLUSION: Cell colony with the feature of EPCs can be isolated and cultured from rabbit bone marrow by in vitro amplification method successfully.

Pooled literatures showed that the induced abortion in China faces many problems:the number of induced abortion remains large; most cases are young and nulliparity women; the frequency of abortion is high; and the interval between one and another abortion is short. Health promotion strategies should be applied to address these problems. It is important to increase the population's awareness of contraception,especially among nulliparity and migrant populations. Routine and effective contraceptive methods should be recommended and emphasized during induced abortion and delivery to lower the rate of induced abortion.
Abortion, Induced ; statistics & numerical data ; China ; Female ; Humans ; Pregnancy

Adolescent ; Adult ; Female ; Health Education ; Health Knowledge, Attitudes, Practice ; Health Services Needs and Demand ; statistics & numerical data ; Humans ; Male ; Middle Aged ; Occupational Health ; statistics & numerical data ; Rural Population ; statistics & numerical data ; Surveys and Questionnaires ; Transients and Migrants ; statistics & numerical data ; Young Adult

Objective:To assess the effect of auto-bone marrow mononuclear cells (BMMNCs) transplantation on reendothelialization and neointima formation in vein grafts. Methods: BMMNCs were extracted from the bone marrows of adult rabbit under sterile environment and were labelled with DAPI before transplanted into vein grafts. Twenty adult rabbits were randomly divided into 2 groups: BMMNCs transplantation group(groupⅠ,n=10) and PBS transplantation group (group Ⅱ, n=10). The left external jugular vein of 20 rabbits were harvested and transplanted between ipsolateral common carotid artery(AVG). Three days later, animals in group Ⅰ were transplanted with BMMNCs(6?108 cells)/100 ?l via periotic veins and those in groupⅡwere injected with 100 ?l PBS. Animals were killed 4 weeks later and graft veins were harvested to observe the reendothelialization and the thickness of vein grafts. Results: We found that the transplanted cells survived and were incorporated into the endothelium of vein grafts in groupⅠ.The endothelium integrity of the vein grafts in groupⅠwas significantly better than that of groupⅡ. The intima thickness of vein grafts in groupⅠwas significantly thicker than that of groupⅡ. Conclusion: BMMCs transplantation therapy may improve reendothelialization of the vein graft and inhibits intimal hyperplasi the vein graft.

Corticotropin-releasing hormone(CRH) is the key regulator during stress reaction which integrates endocrine,autonomic,immune and behavioral responses to stressors.Receptors mediating the action of CRH have been identified as CRH-R1,CRH-R2 and CRH-R3.In the process of stress reaction,CRH mainly interacts with CRH-R1 and CRH-R2,producing multiple physiological and pathological effects.In recent years,by employing transgenic animals,selective CRH-receptor antagonists and special CRH-receptor agonists,the effect of CRH receptors on stress reaction and its mechainisms have been deeply realized.

Objective To evaluate the associations of human leukocyte antigen(HLA)-DQ gene with autoimmune polyglandular syndrome(APS),type 1 diabetic mellitus(T1DM) and autoimmune thyroid disease(AITD).Methods Fifteen cases of APS,29 cases of T1DM and 40 cases of AITD were selected as research subjects,while 27 healthy children were selected as controls.The DQA1 and DQB1 alleles were determined by polymerase chain reaction(PCR) and sequence-based typing method.The difference of their frequency in children and adolescents was analyzed.Results Compared with controls,APS and T1DM patients had increased frequency of subjects with DQA1*0301,0501(all P

Objective To study the effect of SDF1/CXCR4 and FN/?1 integrin modulated by curcumin on the adhesion and migration of B lymphoma Raji cell and to explore the mechanism of curcumin to inhibit the invasiveness of lymphoma.Methods The experiment consisted of eight groups: Control,FN,SDF,FN+anti-?1 integrin,SDF+anti-CXCR4,curcumin+FN,curcumin+SDF.Adhesion assay and migration assay were used to detect the difference of invasiveness among different groups.Results In vitro,SDF1 and FN can increase the adhesion and migration of Raji cells,which can be blocked by ?1 integrin antibody and CXCR4 antibody.Curcumin can inhibit the adhesion and migration of Raji to FN in a dose-dependant manner.Low dosage curcumin had minimal effect on the adhesion and migration of Raji induced by SDF except that 25?mol/L curcumin can inhibit the adhesion and migration of Raji.Conclusion FN/?1 integrin and SDF1/CXCR4 pathway play important roles in the adhesion and migration of Raji cells.Curcumin can decrease the invasiveness of Raji cells through inhibiting FN/?1 integrin.It has good prospect of clinical application.

AIM:To investigate the inhibitory effects of triptolide on cell proliferation and metastasis in Burkitt's lymphoma cell line Raji cells.METHODS: The effects of triptolide on the growth of Raji cells were studied by 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium(MTT) assay.The effects of triptolide on the cell apoptosis of Raji cells were detected by using Annexin Ⅴ/PI double-labled cytometry.The effects of triptolide on CXCR4 expression on Raji cells were studied by flow cytometric analysis.Chemotaxis assays were performed to observe the effects of triptolide on migration of Raji cells towards recombinant human SDF-1?(rhSDF-1?)in vitro.RESULTS: Triptolide inhibited the proliferation of Raji cells in a dose-and time-dependent way with a 24 h IC50 value of 43.06 nmol/L and a 36 h IC50 value of 25.08 nmol/L.Following the treatment of triptolide,the cell apoptosis rate was increased as the treatment concentration increased and the culture time extended.The effects were dose-and time-dependent.Triptolide could downregulate the expression of CXCR4 on Raji cells in a dose-dependent manner.Moreover,chemotaxis assay suggested that triptolide could block the migration of Raji cells to rhSDF-1? in vitro,and the inhibition was dose-dependent.CONCLUSION: Triptolide could inhibit the cell proliferation and induce the cell apoptosis of Raji cells.Furthermore,it could block the cell metastasis of Raji cells in vitro and the underlying mechanism might be related to the inhibition of the SDF-1/CXCR4 axis.