AIM:To investigate whether specific small interfering RNA ( siRNA) targeting Toll-like receptor 4 ( TLR4) gene inhibits the proliferation of cervical cancer cell line HeLa through NF-κB signaling pathway and down-regula-tion of Bcl-2 expression.METHODS:Three specific TLR4 siRNAs and 1 negative siRNA were transfected respectively in-to HeLa cells.The expression of TLR4 at mRNA and protein levels was measured by reverse transcription-polymerase chain reaction ( RT-PCR) and Western blotting , respectively .The protein expression of p 65 and Bcl-2 was detected by Western blotting.The cell proliferation was determined by MTT assay and plate colony formation assay .The apoptotic rate of the cells and the cell cycle were analyzed by flow cytometry .RESULTS:In comparison with the other 2 kinds of TLR4 siR-NAs, TLR4-siRNA-003 demonstrated the strongest silencing effect on TLR4 gene expression in the HeLa cells at 48 h after transfection.The expression of TLR4 at mRNA and protein levels was reduced by 62% and 89%, respectively.The pro-tein levels of p65 and Bcl-2 significantly decreased .The growth rate of HeLa cells transfected with TLR 4-siRNA-003 was significantly inhibited .Moreover , the cell apoptotic rate increased significantly and the cell cycle was arrested at G 1 phase as the HeLa cells were transfected with TLR 4-siRNA-003 for 48 h.CONCLUSION:Specific TLR4 siRNA effectively in-hibits the expression of TLR4 and inhibits the proliferation of cervical cancer HeLa cells through NF-κB signaling pathway and down-regulation of Bcl-2 expression, indicating that TLR4 may be a new target for the treatment of cervical cancer .

Objective To establish an appropriate cut-off value of high sensitivity cardiac troponin T (hs-cTnT) and optimal combination measurement in the early diagnosis of acute myocardial infarction (AMI).Methods This research is a prospective study.342 patients admitted to emergency department with chest pain,43 patients with renal failure,40 patients with pneumonia and 18 premature with patent ductus arteriosus were involved from June 2012 to June 2013 in Peking University Third Hospital.The plasma hs-TnT,NT-proBNP,cardiac troponin Ⅰ (cTnI),CK-MB and copeptin were measured.The distribution of hs-cTnT among associated diseases was analyzed,the diagnostic performance of hs-cTnT and the role of combination hs-cTnT with NT-proBNP,CK-MB and copeptin were evaluated by receiver operating characteristic (ROC) curve.The statistical method was used to calculate the Sensitivity,specificity,negative predictive value and positive predictive value of hs-cTnT in the diagnosis of AMI.Results As compared to patients with STEMI(median 0.52 μg/L,range 0.037-7.610 μg/L),hs-cTnT was lower in the patients with Non-STEMI(median 0.127 5 μg/L,range 0.021-4.260 μg/L).However,the levels of hs-TnT in other diseases were also increased increased in varyng degrees (Chi-square =76.432,P ＜ 0.05)The areas under the curve (AUC) for hs-cTnT and cTnI in the diagnosis of AMI were 0.862 (95％ CI:0.729-0.928) and 0.748 (95％ CI0.666-0.818) respectively (Z =2.713,P ＜ 0.05).Taking 0.014μg/L and 0.035 μg/L as cut-off value of hs-TNT,the sensitivities were 100％ vs 95.1％,the specificities were 44.4％ vs 65.7％.The combination of hs-cTnT,NT-proBNP,CK-MB resulted in a increase in AUC (0.915,95％ CI:0.838-0.964) (Z =2.147,P ＜ 0.05) and the combination of hs-cTnT and copeptin resulted in a increase in AUC 0.921 (95％ CI:0.820-0.975) (Z =2.589,P ＜ 0.05).Conclusion With the cut-off value of 0.035 μg/L for diagnosis of AMI was appropriate,and the combination measurement can improve the accuracy of early diagnosis of AMI.

Objective To observe the effects of ultrasound medium frequency electrotherapy on pain and content of enkephalins. Methods The pain threshold of the rat was measured before and after the application of ultrasound medium frequency electrotherapy. The content of met enhephalin(MEK) and leu enkephalin(LEK) in the glandula hypophysis and hypothalamus was also measured. A linear regression analysis based on the pain threshold and the content of enkaphalin was conducted to reveal the pain relieving mechanism of the ultrasound medium frequency electrotherapy. Results The level of MEK and LEK in the glandula hypophysis and hypothalamus was significantly increased after a single use action ultrasound medium frequency electrotherapy as compared with that before the treatment ( P

Objective To develop a dental crown remover with the strength provided constantly and adjusted freely.Methods The remover was composed of a shell, a crown hook, a conduction mechanism, a strength generating mechanism and a percussion mechanism. The spring had the explosive force formed in the crown head to destruct the cohesion of the cement.Results The remover could remove the crown, with one hand freed for the protection of abutment and mucous membrane.Conclusion The remover has simple structure and easy operation, and is worth popularizing clinically.

Objective To evaluate the clinical outcome of Osteoset artificial bone mixed Rifampicin for injection after radical debridement in the treatment of sacroiliac joint tuberculosis,and compare with debridement alone.Methods From May 2005 to August 2010,48 patients with sacroiliac joint tuberculosis patients underwent two different surgical methods were selected as analysis subjects in the Orthopedics Department of Chest Hospital of Hebei Province.Among them,27 cases underwent radical debridement and fusion with Osteoset artificial bone combined with Rifampicin for injection (Grafting group),and 21 case were treated with radical debridement only(Control group).The local wound healing,adverse reactions and regular imaging examination (pelvic X-ray and CT scan) were observed,and the surgical time,the intraoperative blood loss,postoperative 6 months and 12 months,18 months bone graft fusion rate,and Majeed scoring results of the patients were recorded and statistically analyzed.Results All patients were followed up from 20 to 30 months with an average of 24 months.There was no significant difference in terms of surgical time and operative bleeding between the two groups(P＞0.05).The rate of bone fusion in grafting group was 33.33％ (9/27) of 6 months after operation,88.9％(24/27) of 12 months after operation,and 96.3％ (26/27) of 18 months after operation.While that in control group was 4.76％ (1/21) of 6 months after operation,42.85 ％ (9/21) of 12 months after operation,and 42.85％ (9/21) of 18 months after operation.The differences of these parameters between the two groups were significant(x2 =5.85,20.92,15.90;P＜0.05).According to Majeed scoring system,the excellent and good rates were 100％ (27/27) in grafting group,76.19％ (16/21) in control group,the difference was statistically significant(x2=7.18 P＜0.05).Conclusion With Rifampicin loaded Osteoset artificial bone can recruit bone graft mass during the bone fusion for sacroiliac joint tuberculosis,and reduce the adverse reactions,achieve bone fusion earlier than the control group.

BACKGROUND:There are various therapies for children limb fractures involving the epiphysis or the metaphysis. According to the different methods, studies on the growth of the epiphyseal plate are a lot, most of which focus on the effects of Kirschner wires with different diameters or holow screw internal fixation on the development of epiphyseal plate. However, there are rare studies on the influence of cross-epiphyseal plate internal fixation on the growth of epiphyseal plate as wel as the influence level. OBJECTIVE:To prepare a peri-epiphyseal fracture model in young rabbits and to observe the effects of cross-epiphyseal plate implantation and removal on the growth of epiphyseal plate. METHODS: Traverse fracture models were made 5 mm above the right femoral distal epiphyseal plate of 60 young rabbits, and then fixed with suitable “L” steel plate and four screws across the epiphyseal plate and peri-epiphyseal fracture line. The left side served as control. Eight rabbits were kiled and observed at 2, 4, 8, 12 weeks after modeling, respectively, to take out the femoral specimens for measurement of femoral length, thickness of the epiphyseal plate, and number of mastocytes per unit column. Histopathology observation was done and changes in mastocytes and thickness of the epiphyseal plate were detected. Another seven rabbits were selected to remove the metal plate, continued to feed for 2 weeks and finaly executed to observe the above-mentioned indexes. RESULTS AND CONCLUSION: (1) There were significant differences in the above indexes between the plate and control groups at 4, 8, 12 weeks after modeling (P < 0.05 orP< 0.001) but not at 2 weeks after modeling (P> 0.05). These findings indicate that within 2 weeks after cross-epiphyseal plate internal fixation, proper pressue has no remarkable influence on the growth of epiphyseal plate; but after persistent internal fixation (> 4 weeks), the growth of epiphyseal plate can be partialy or completed retarded. (2) At 2 and 4 weeks after modeling, the plate was removed, and 2 weeks later, the femoral length, thickness of the epiphyseal plate and mastocyte counting per unit column were improved to different extents, and there were no differences between the plate and control group (P > 0.05). At 8 and 12 weeks after modeling, the plate was removed, and 2 weeks later, the femoral length and thickness of the epiphyseal plate were shortened, and the number of mastocytes per unit column was decreased obviously, which significantly differed from the control group (P < 0.001). These findings indicate that the chondrocytes in the proliferative and hypertrophy layers lose the differentiation and proliferation abilities, and the femoral length and epiphyseal plate thickness are difficult to recover.

ObjectiveTo study the relationship between 18F-FDG uptake and tumor cell density,glucose transporter expression,cellular proliferation and angiogenesis before and after radiotherapy in C6 glioma rats.MethodsThirty C6 glioma-bearing male SD rats were randomly divided into three groups:A,B and C ( 10 rats in each group).Two weeks later,18F-FDG PET/CT was performed in group A.In groups B and C,18 F-FDG PET/CT was performed at 48 h and 1 week after radiotherapy,respectively.The ratio of SUVmax of tumor to muscle (T/M) was calculated.HE staining,immunohistochemical staining and Western blot were used to measure tumor cell density,Ki67 labeling index ( LI),microvessel density ( MVD),Glut-1 and VEGF expression quantitatively.The one-way analysis of variance and bivariate correlation analysis were used to compare the changes of each indicator and evaluate the correlation between T/M and biological indicators,respectively.Results Significant differences of T/M,tumor cell density,Ki67 LI,MVD,Glut-1 and VEGF among groups A,B and C were observed ( F =6.77,60.66,104.56,95.49,9.13,24.48,respectively,all P ＜0.05).Least significant difference (LSD) test showed that there was no significant difference between group A and B in T/M,tumor cell density and Ki67 LI ( 10.86 ± 3.31,730.50 ± 78.93,20.02 ± 2.14 vs 9.23 ± 4.56,672.70 ± 92.98,18.56 ± 2.26).However,the indicators of group C (5.16 ± 2.52,355.60 ± 72.62,7.81 ± 1.76 ) were significantly decreased compared with those of groups A and B (all P ＜0.05 ).MVD and Glut-1 expression of group B increased slightly compared with those of group A ( 19.50 ± 1.96,0.20 ± 0.09 vs 17.90 ± 2.02,0.15 ± 0.04),but the difference was not statistically significant.Nevertheless,the two indicators were significantly decreased in group C ( 8.40 +1.84 and 0.07 ±0.06,P ＜0.05).VEGF expression in group B (0.42 ±0.13) was significantly higher than that in groups A and C (0.17 ±0.04 and 0.16 ± 0.09) ( both P ＜ 0.05 ).The changes of T/M were positively correlated with the changes of tumor cell density between groups A and B ( r =O.81,P ＜ 0.05 ).Changes of T/M were positively correlated with the changes of tumor cell density,Ki67 LI,MVD and Glut-1 between groups A and C (r =O.83,0.71,0.68,0.62,all P ＜ 0.05 ).ConclusionsThe changes of 18 F-FDG uptake in C6 glioma rats were only correlated to the changes of tumor cell density at 48 h after radiotherapy.However,the changes of 18F-FDG uptake closely correlate to the changes of a variety of biological indicators at 1 week post radiotherapy.

Adult ; Aged ; Female ; Humans ; Lung Neoplasms ; blood ; genetics ; Male ; Middle Aged ; Mutation ; Tumor Suppressor Protein p53 ; blood ; genetics

Objective To develop a model that could copy the pathological development of psoriasis, the triple-transgenic mice that harboring Plasminogen activator, urokinase ( PLAU) ,PLAU receptor ( PLAUR) and signal transducer and activator of transcription 3 ( STAT3 ) were generated.They are the important genes involved in the pathological development of psoriasis.Methods The transgenic plasmid was constructed by insertion of the PLAU, PLAUR and STAT3 into the downstream bovine keratin 5 promoter respectively.The transgenic mouse was produced by microinjection and the genotyping was detected by PCR.The expression level of the transgenic gene was determined by Western blotting.The pathological changes were observed by HE staining.Results One mouse line was selected with over expression of the PLAU, PLAUR and STAT3 in the tissue of skin.The transgenic mice showed decreased dermal layer, a hyperkeratinized cuticular layer and increased stratum spinosum.The number of hair follicle was reduced and developed abnormally in the transgenic mice.The Munro abscess in the dermal layer and the increased inflammatory cell infiltrates in dermal layer were also observed in the transgenic mice.Conclusions A transgenic mouse line was produced and passage stably, which expressed the PLAU, PLAUR and STAT3 in the tissue of skin and developed the psoriasis progressively.All of our results suggested that the transgenic mice were a useful animal model for psoriasis.

Objective To observe the effect of Sinisan on the learning and memorial ability and the expression of synaptohydin in the hippocampus of exercise-fatigue rats. Methods Rats were made into the fatigue model by Exhaustive Swimming. Learning and memorial ability of the rats were observed by moving-back with current stimulation experiment; expression of synaptohydin protein in hippocampus of exercise-fatigue rats treated with Sinisan for 10 days were detected by immunohistochemistry technique and compared to control group and model group.Results The moving-back time and the error times of the exercise-fatigue rats as follows: model group(73.00±61.96) s/(1.67±1.15), control group(144.25±57.14) s/(0.50±0.80)，Sinisan group (166.17±47.92) s/(0.38±0.49). Comparison of mean optical density of synaptohydin protein in hippocampus of rats in different groups as follows: control group (0.2636±0.10654) and Sinisan group (0.2555±0.163380) were higher than the model group (0.0474±0.1837)(P<0.05). The synaptohydin staining Results showed that synaptohydin-positive granules around the neuron in hippocampus of rats in control group were the darkest and densest, the Sinisan group were darker than the model group rats.Conclusion Sinisan could improve the learning and memorial ability and increase the synaptohydin protein in the hippocampus of the exercise-fatigue rats.