Objective:To investigate the inhibitory effect and its possible molecular mechanisms of MicroRNA-34a(miR-34a) on the human nasopharyngeal carcinoma CNE-2 cell line subcutaneous xenograft tumor in nude mice.Methods: The human nasopharyngeal carcinoma CNE-2 cell line was cultured in vitro.miR-34a and Scrambled miRNA recombinant plasmids were successfully established and stably transfected into CNE-2 cells.Fifteen six-week-old male nude mice were divided randomly into three groups:miR-34a group(5 mice) ,Scrambled miRNA group(5 mice) ,Blank control group(5 mice).Different CNE-2 cells were subcuta-neously injected on the back near right lower limb.Tumor volumes were examined every 7 days.Mice were executed on the 35 days,and the eventual average tumor volumes and weights were examined.Total RNA and protein were isolated from tumors,and the expression of miR-34a,CDK6,and Bcl-2 mRNA and protein were determined by qRT-PCR and western blot,respectively.Results: The relative expressions of miR-34a was significantly up-regulated in miR-34a transfected group compared to Scrambled miRNA transfected group (P<0.05).Eight subcutaneous xenograft tumor models were successfully established.The nude mice of miR-34a transfected group appeared a smaller tumor volume compared to the other two groups at the beginning of 21th day( P<0.05).The eventual average tumor volumes in miR-34a group,Scrambled miRNA group and blank control group were(351.37±98.19)mm3,(798.75±91.04)mm3 and
(849.62±101.32) mm3 ,respectively,and the eventual average tumor weights in miR-34a group,Scrambled miRNA group and blank control group were(0.81±0.13)g,(1.47±0.21)g and(1.58±0.37)g,respectively.Both the eventual average tumor volumes and weights in miR-34a group were lower compared to the other two groups(P<0.05).qRT-PCR results revealed that the expression of miR-34a in miR-34a transfected group was significantly higher than in the other two groups,while the mRNA and protein expression of CDK6 and Bcl-2 were lower than the other two groups ( P<0.05 ) .Conclusion: miR-34a may inhibit the growth of human nasopharyngeal carcinoma CNE-2 cell line subcutaneous xenograft tumor in nude mice by down-regulating CDK6 and Bcl-2.

Objective To determine the content of indirubin in Kangbingan Oral Liquid by UV spectrophotometer methods.Methods The content of indirubin was determined by Heltos Gamma ultravioletvisible spectrophotometer with chloroformic solution of 2～8 ?g/mL confected by standard sample of indigotin and indirubin.The sample of negative blank solution was confected by the prescription without Radix Isatidis.The standard sample and the blank sample were determined separately with the wavelength at 500～700 nm.Results Indirubin had the maximum absorption at wavelength of 540.0 nm and indigotin had the maximum absorption at wavelength of 634.5 nm.The linear correlation was available at the range of 0.20～1.40 ?g/mL,and the correct coefficient was 0.999 4.The average recovery rate was 99.05% and RSD was 0.87%(n=6).Conclusion This method is simple and accurate,and can be used to control the quality of Kangbingan Oral Liquid.

Objective To evaluate the peripheral dose (PD) from megavoltage cone-beam CT (MVCBCT) imaging for head-and-neck region image-guided radiation therapy,to determine the correlation of PD with monitor unit (MU),and to investigate the impact of imaging field size on the PD.Methods Measurements of PD from MVCBCT were made with a 0.65 cm3 ionization chamber placed in a specially designed phantom at various depths and distances from the field edges.The PD at reference point inside the phantom was measured with the same ionization chamber to investigate the linearity between MU used for MVCBCT and the PD.The homogeneity of PD in the axial plane of the phantom were measured.Results PD from MVCBCT increased with increasing number of MU used for imaging and with increasing the field size.The measured PD in the phantom decreased exponentially as distance from the field edges increased.PD also decreased as the depth from the phantom surface increased.There was a strong linear relationship between PD and MUs used for MVCBCT.The PD was heterogeneous,with higher dose at the anterior than the posterior.Conclusions The PD from MVCBCT depend much on the MVCBCT delivery MU and the scan field size.In clinic,using the smallest number of MU allowable and reducing MVCBCT scanning field size without compromising acquired image quality is an effective method of reducing the PD.

Objective To evaluate the effect of non-linear blending function for dual-energy CT on image of pulmonary angiogra-phy.Methods 27 patients underwent dual energy CT pulmonary angiography(CTPA).Data obtained with 100 kVp,140kVp,and non-linear blending were divided into group A,B,and C respectively.CT value of emboli were measured.Corresponding signal to noise ratio(SNR )and contrast to noise ratio(CNR)were calculated.One-way Anova analysis and Friedman test were used to ana-lyze statistical significance among these values.Results On quantitative analysis of 27 patients,there was no statistical difference for CT value of CTPA among the three groups(P >0.05).For the noise,CNR and SNR,there were statistically significant among the three groups(P <0.05).Conclusion The non-linear blending function has certain advantages in improved image signal-to-noise ratio and it can be used in CT pulmonary angiography examination for patients suspected pulmonary embolism clinically .

Objective:To systematically evaluate the influence of the implementation of essential drug policy ( EDP) on prescrip-tion use rate of antibiotics in primary hospitals. Methods:Based on CNKI, Wanfang and VIP of China journal databases, all litera-tures were adopted including the data of the prescription use rate of antibiotics in primary hospitals. RevMan5. 3 and Stata 12. 0 soft-ware were used to conduct the Meta analysis. Results:Totally 43 literatures were included in the study according to the evaluation se-lection criteria. After the implementation of EDP, the prescription use rate of antibiotics in primary hospitals was decreased, and com-pared with that before the implementation of EDP, the risk difference value was significant [RD= -0. 03,95%CI( -0. 04,-0. 03), P<0. 000 01], while the use rate was still high (46. 16%). The result of Egger’s test indicated the publication bias of the 43 litera-tures was not significant (P=0. 571). However, there was high heterogeneity(I2 =94%,P<0. 000 01)among the different studies. Based on the classification of hospital type and different areas, the results of sub-group analysis showed the differences of study methods in the literatures and regional implementation measures of EDP contributed to the high heterogeneity among the different studies. Con-clusion:In order to reduce the heterogeneity of studies, a unified evaluation criteria for the research quality of the cross-section survey should be established. And special policies related to EDP should be taken to effectively decrease the use rate of antibiotics in primary hospitals.

Objective To evaluate the effects of tumor-associated macrophages on the proliferation,invasion and migration of human cutaneous malignant melanoma cells.Methods Cultured U937 human monocytic cells at logarithmic phase were classified into three groups to be pretreated with phorbol ester for 48 hours followed by 48-hour activation by phorbol ester (M polarization),lipopolysaccharide (LPS) at 25 mg/L (M1 polarization),and interleukin (IL)-4 at 15 μg/L (M2 polarization) respectively.Then,enzyme-linked immunosorbent assay (ELISA) was performed to determine the levels of IL-12p70 and IL-10 in the supernatant of these activated cells.A375 human malignant melanoma cells were divided into four groups to be cultured alone or with M-,M1-and M2-polarized macrophages respectively.After additional culture for different durations (24,48 and 72 hours),methyl thiazolyl tetrazolium (MTT) assay was conducted to estimate the proliferative activity,and Transwell assay to evaluate the invasion and migration activity,of the A375 cells.Results The proliferation of A375 cells was accelerated by coculture with M-and M2-polarized macrophages,but inhibited by that with M1-polarized macrophages,with significant differences among the four groups in the proliferative activity at 48 and 72 hours (all P ＜ 0.05),but not at 24 hours (P ＞ 0.05).Invasion assay showed that the number of A375 cells that migrated through Transwell chambers was significantly larger in M2 and M groups (147.00 ± 7.92 and 113.22 ± 8.15 respectively),but smaller in the M1 group (56.44 ± 7.55),than in the control group (84.11 ± 6.07,all P ＜ 0.05).Similarly,migration assay revealed a significant increase in the number of A375 cells that migrated through Transwell chambers in the M2 and M(p) groups (198.33 ± 8.22 and 156.00 ± 8.83 respectively),but a significant decrease in the M1 group (97.11 ± 6.75) as compared with the control group (123.89 ± 7.01,all P＜ 0.05).Conclusions The proliferation,invasion and migration of A375 cells can be accelerated by IL-4-activated M2-polarized macrophages,but decelerated by LPS-activated M1-polarized macrophages.Phorbol ester tends to induce monocytic cells to differentiate into M2-polarized macrophages.

Objective To study the role of endoscopic retrograde cholangiopancreatography (ERCP) in diagnosing and treating iatrogenic bile duct injury after laparoscopic cholecystectomy (LC).Methods A retrospective study was conducted on 45 patients with iatrogenic bile duct injury after LC who were investigated and treated by ERCP from December 2002 to August 2015.Results Using the StrasbergBismuth classification,there were 14 patients with type A and 4 with type C who were managed successfully using endoscopic nasobiliary drainage (ENBD) and interventional ultrasound abdominal localized puncture and drainage ; 7 patients with type D were managed successfully using endoscopic sphincterotomy (EST) and endoscopic retrograde biliary drainage (ERBD).For the 5 patients with type E Ⅰ and 3 patients with type E Ⅱ who were treated by EST and ERBD,one patient who had common bile duct transection required cholangioenteric Roux-en-Y anastomosis.For the 6 patients with type E Ⅲ and 6 patients with type EⅣ who were treated by EST and ERBD,a patient required a cholangioenteric Roux-en-Y anastomosis to achieve good results.Conclusions When iatrogenic bile duct injury is suspected after LC,correct assessment with ERCP should be taken immediately.ERCP when combined with ENBD and (or) ERBD could reduce bile duct pressure and dilate stenotic bile ducts to avoid further operation.

Objective To investigate long-term care needs and its influencing factors among old people with chronic diseases in nursing homes in rural area of Liaoning. Methods A total of 502 elderly with chronic diseases were recruited using convenience sampling method from eight nursing homes in rural area of Liaoning, and were investigated with the general information questionnaire, Short Form 36-item Health Survey (SF-36) and long-term care needs questionnaire from March 2015 to January 2016. Results Logistic regression analyses were used to identify that age (P=0.000), old patients′ disease condition (P=0.008), marriage (P=0.013) and quality of life (P=0.000) were major factors affecting long-term care needs. The top three highest percentage services were seeing the doctor 85.26% (428/502), assisting with taking the medicine 80.28% (403/502), assisting with bathing 70.32% (353/502). Conclusions This study suggests that we should improve the quality of services of long-term care needs based on the demands of old people with chronic diseases in nursing homes in rural area.

OBJECTIVE:To effectively prevent and treat antibiotic-associated diarrhea (AAD). METHODS: Take some clinical cases to analyse and summarize the result about multiple micro-ecological preparations such as probiotic yoghurt,lively bacterium preparation and prebiotics being used to prevent and treat AAD. RESULTS: It was showed by cases that probiotic yoghurt and lively bacterium preparations could effectively prevent AAD in patients with AAD risk factors,and the application of micro-ecological preparations exhibited a remarkable efficacy for the patients with AAD. CONCLUSION: Rational application of micro-ecological preparations is conducive to the prevention and treatment of AAD.

Flow cytometry (FCM) is used for multi parameter and rapid quantitative analysis of biological particles,such as all cells,microorganisms and synthetic microspheres in fast line flow state.It is also a modern cell analysis technology for the separation of specific groups.In recent years,FCM has been applied in the field of assisted reproductive medicine.FCM plays an important role in the diagnosis of immune infertility and predicting the fertilization ability of sperm.This article aims to review FCM application in peripheral immune cell surface marker detection for infertility patients,and research on the structure and function of sperm cell.