Objective Insulin-like growth factor-1 receptor (IGF-1R),similar to insulin receptor,is one of the families of re- ceptor tyrosine kinases.,which has been found to be overexpressed in a variety of cancer.It is the main proliferation and survival sig- nal molecule in cancer cell and plays an important role in cancer growth and progress.Blocking signal transduction of IGF-1R by vari- ous strategies can suppress tumor growth and induce regression of established tumor.This study is to construct the siRNA expression vector targeting IGF-1R and to evaluate its ability to induce cell apoptosis in human lung cancer cells.Methods Two siRNA expres- sion vector,pENTR/U6-shRNA-1 and pENTR/U6-shRNA-2 targeting IGF-1R,were constructed using pENTR/U6 vector,and a vector targeting hieiferase gene,pENTR/U6-shRNA-Iuc,was constructed as control.After vectors were transfected into A549 for 48h, knockdown of IGF-1R mRNA and protein and Akt phosphorylation were accessed,and DNA ladder and flow cytometry were used for cell apoptosis.Results siRNA expression vectors targeting IGF-1R were successfully constructed,which was confirmed by PCR and DNA sequencing,pENTR/U6-shRNA-1 and pENTR/U6-shRNA-2 demonstrated the expression were (22.1?2.5) % and (80.1? 3.9) % in IGF-1R mRNA level,(15.2?3.1)% and (47.1?4.1)% in protein level,respectively,compared with pENTR/U6- shRNA-luc.Suppression of IGF-1R by pENTR/U6-shRNA-1 blunted Akt phosphorylation,increased cell apoptosis induced by 3% ethanol,and retained 77.5 % A549 cells in the G0/G1 phase.Conclusion siRNA expression vector targeting IGF-1R can effectively suppress the expression of IGF-1R expression in A549.This study suggests that DNA vector-based RNAi has the potential to be effec- tive and practical cancer gene therapy strategy.

BACKGROUND: Similar to other prosthesis, metal-metal prosthesis would produce plenty of wear particles and metal ions, mainly presented as cobalt (Co~(2+)) and chromium (Cr~(3+)), which can lead to osteolysis, eventually, result in aseptic loosening. OBJECTIVE: To observe the effect of Co~(2+) and Cr~(3+) ions on the cells viability and expression of RANK in rats m0nocyte-macrophage cells (RAW264.7) in vitro. METHODS: Monocyte-macrophage cells (RAW264.7) were cultured in vitro, and then the cells were exposed to Co~(2+) and Cr~(3+) ions. The cell viability was assured by MTT test and the level of RANK Mrna was detected by semi-quantitative RT-PCR at different times. RESULTS AND CONCLUSION: Compared to the control group, MTT test demonstrated that Co~(2+) and Cr~(3+)ions could decrease the cell activity of monocyte-macrophage cells obviously. When the cells were exposed to Co~(2+) Cr~(3+) ions, compared to the control group, the Mrna expression of RANK of the metal ions group was increased at 12 hours (P < 0.05), reached its peak level at 24 hours (P < 0.05), and decreased at 48 hours than that of 24 hours (P < 0.05). The results revealed that metal ions have a cytotoxic effect on monocyte-macrophage cells, stimulate the expression of RANK, and have the potential of facilitating monocyte-macrophages cells transform into osteoclast-like cells.

ObjectiveTo analyze the prevalence and epidemic trend of human brucellosis between 2007 -2010 in Qian'an county,and to provide a basis for future prevention and control measures. Methods Epidemiological data of brucellosis between 2007 - 2010 were obtained from the national disease surveillance report on management information system, population data were from the national disease surveillance information management system for basic information reporting system, and descriptive epidemiological methods was used for statistical analysis. Results A total of 86 cases were infected with brucellosis in Qian'an county from 2007 to 2010, with 68 cases of male and 18 cases of female, and male to female ratio was 3.78 : 1. Patients were mainly in the age of 20 - 55, with 40 - ＜ 45 year-old group the highest. All patients were local residents. Most professional were livestock acquisition, processing and aquaculture personnel. The majority of patients lived in Jianchang town,with 51 cases, accounting for 59.30％. Thirteen patients were reported in 2007, incidence was 0.0201‰(13/ 647 983). Thirty-nine patients were reported in 2010, and incidence was 0.0563‰(39/657 380). There was a fluctuations increase from 2007 to 2010. In 2007 brucellosis occurred in only two townships(towns), which spread to eight townships (towns) and urban areas in 2010. ConclusionsThe epidemic of human brucellosis in Qian'an is in a spreading trend. We recommend the government to strengthen the quarantine of livestock, and the infected livestock should be timely treated. Strengthen the prevention and control in Jianchangying. At the same time increase the brucellosis propaganda, and enhance self-protection awareness of the occupational groups.

Objective To investigate the state of drinking water defluorination project in Dagang district and study urinary fluoride levels and detect dental fluorosis of children aged 8 to 12, and to provide scientific basis for prevention and control of fluorosis. Methods Five defluorination projects in rural streets (towns) with highfluoride water and 2 urban water supply projects were choosen to investigate the running status in Dagang district Tianjin in 2009. Five rural and 2 urban schools were choosen to select 100 children aged 8 to 12 (for gender, age matched) in each primary school to study urinary fluoride levels and detection of dental fluorosis. Results A total of 66 defluorination projects in 73 villages were surveyed, among which 61 projects actually worked normally with using rate 92.4%(61/66). Water qualification of all projects could not be ensured due to direct project managers'lack of necessary expertise. In 2009, water qualification rate were 39.3%(24/61 )among the project normally used,with highlighted problem of biological pollution. A total of 490 children aged 8 - 12 in 5 rural towns were surveyed,dental fluorosis rate were 90%(441/490), and dental fluorosis index were 1.82. A total of 207 children aged 8 - 12in 2 urban areas were surveyed, the detection rate of dental fluorosis was 49.8%(103/207), and dental fluorosis index were 0.86. The urinary fluoride level of 230 children aged 8 - 12 in the 5 villages were surveyed. The Range of geometric mean of urinary fluoride were 1.82 - 2.70 mg/L. The urinary fluoride of 102 children aged 8 - 12 in the 2 urban area were surveyed. The Range of geometric mean of urinary fluoride were 1.53 - 1.72 mg/L. Conclusions There was phenomenon of high coverage, low utilization rate and less water consumption in the villages of Dagang district, Tianjin drinking water defluoridation projects, thus the health effects of the projects was minimum.Significant health effects is found in the defluorination projects in the urban areas with high coverage and high utilization rate. Studying new water improvment methods and new forms of water supply system is urgent for solving the problems met in the ineffective water defluorination project.

Objective To analyze the epidemiologic characteristics of epidemic hemorrhagic fever syndrome (EHF) from 2004 to 2010 and provide scientific basis for formulating control measures.Methods Epidemiological data of EHF between 2004 to 2010 were obtained from the“National Disease Surveillance Report on Management Information System”,and the population data were from the“National Disease Surveillance Information Management System for Basic Information Report System”.Descriptive epidemiological methods was used for statistical analysis.ResultsA total of 173 cases were reported in Qian'an from 2004 to 2010.From 2004 to 2010,the cases were 86,67,12,1,0,1,and 7 cases,respectively,and the rate were 13.12/10 million ( 86/640 249 ),10.42/10 million (67/642 688 ),1.86/10 million ( 12/645 124),0.15/10 million (1/647 983 ),0(0/650 720),0.15/10 million( 1/653 839),and 0.11/10 million(7/657 380),respectively.The overall rate was 3.86/10 million(25/648 283) of population.From 2004 to 2008 the incidence reported declined rapidly,then increased slowly after 2009.The cases were found intensively in winter(November - next January) and spring season (february - may).The incidence in the age group of 10 - 45 was higher than that of other age groups,and the total number of cases was 82.08％(142/173).The incidence in males( 114 cases) was higher than that of females(59 cases).Occupational distribution mainly to peasants and students,which accounted for 87.86％ (152/173).Conclusions Epidemic in the city declines rapidly follows by a slow recovery,suggesting that in the future surveillance,mice-killing and protection of vulnerable population should be strengthened.

OBJECTIVE To understand the distribution and epidemiology of ESBLs in ceftazidime or cefotaxime-(resistant) clinical Enterobacter cloacae isolates.METHODS Twenty seven ceftazidime or cefotaxime-resistant(nonrepetitive) E.cloacae were collected from 27 patients hospitalized at the Huashan Hospital,Shanghai.PCR and(sequencing) were performed to understand the distribution of ESBLs in E.cloacae;rep-PCR was(performed) to(understand) the epidemiology of ESBLs in E.cloacae.RESULTS CTX-M-3 like(ESBLs) were the most prevalent in our study(48%);this was the first report of VEB-1-like ESBLs in the member of(Enterobacteriaceae) in China,and the first report of the ESBLs VEB-1-like and CTX-M-3-like in an isolate simultaneously;the majority of(ESBLs) producers exhibited the same rep-PCR pattern,but harbored different ESBLs gene.(CONCLUSIONS) In our study,ESBLs have become prevalent in clinical E.cloacae isolates,and become an important factor of E.cloacae isolates resistant to extended-spectrum beta(-lactams).

OBJECTIVETo study the expressions of p35 and p25 and Cdk5 kinase activity in cultured rats hippocampal neurons following X-ray exposure to provide experimental evidence for prevention and treatment of radiation encephalopathy.

METHODSThe hippocampal neurons cultured for 12 days were subjected to a single-dose X-ray exposure of 30 Gy. Western blotting was used to detect the p35 and p25 protein levels, and the effect of pretreatment with roscovitine, a Cdk5 inhibitor, on the apoptosis of the hippocampal neurons following the exposure was examined with 4',6-diamidino-2-phenylindole (DAPI) staining.

RESULTSThe protein level of p35 increased significantly 3.5 and 4 h after the irradiation by 1.51-/+0.13 and 1.45-/+0.14 folds in comparison with the control level, respectively (P<0.01), and the p25 level increased significantly 6 h after irradiation by 1.62-/+0.28 folds (P<0.05). Nuclear condensation occurred in (24.8-/+3.97)% of the neurons 24 h after 30 Gy X-ray exposure, a rate significantly higher than that in the nonexposed cells [(1.82-/+1.08)%, P<0.01) and that in roscovitine-pretreated neurons [(7.74-/+2.27)%, P<0.01).

CONCLUSIONX-ray exposure activates Cdk5 by increasing the p35 and p25 expressions in rat hippocampal neurons, and inhibition of Cdk5 activity with roscovitine can significantly protect the neurons from apoptosis.

Animals ; Animals, Newborn ; Cells, Cultured ; Cyclin-Dependent Kinase 5 ; genetics ; metabolism ; Female ; Hippocampus ; cytology ; metabolism ; radiation effects ; Male ; Neurons ; cytology ; metabolism ; radiation effects ; Phosphotransferases ; genetics ; metabolism ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo silence annexin II gene expression by using small interference RNA (siRNA) in prostate cancer cell line PC3.

METHODSFor in vitro transcription, four sequences of 29-nucleotide DNA template oligonucleotides were designed, and one pair of the sequences were complementary to annexin II gene. The other pair was negative control. The 8 nucleotides at the 3' end of each oligonucleotide were complementary to the T7 Promoter Primer. The sense and antisense siRNA templates were transcribed by T7 RNA polymerase and the resulting RNA transcripts were hybridized to create dsRNA. The siRNA was transfected into prostate cancer cell PC3. For assaying the efficiency of siRNA, confocal microscopy, Northern blotting, and Western blotting were employed to examine the expression of annexin II protein and its mRNA. 3H thymidine was used to measure DNA synthesis.

RESULTSThe siRNA sequence specific to annexin II gene was capable of inhibiting the expression of annexin II protein and its mRNA. And cellular DNA synthesis was significantly reduced in siRNA transfected cells.

CONCLUSIONSThe protocol for the synthesis of siRNA by T7 RNA polymerase is feasible. Annexin II might be involved in DNA synthesis.

Annexin A2 ; genetics ; Cell Line, Tumor ; DNA Replication ; DNA, Neoplasm ; genetics ; Humans ; Male ; Promoter Regions, Genetic ; genetics ; Prostatic Neoplasms ; genetics ; RNA Interference ; RNA, Neoplasm ; genetics ; RNA, Small Interfering ; genetics ; Transcription, Genetic

Objective To investigate the value of diffusion weighted imaging(DWI)in predicting delayed encephalopathy of the rabbits brain after carbon monoxide(CO)poisoning.Methods Sixty healthy rabbits were put into self-made poisoning cabinet and were poisoned by inhalation of CO.Aeration of CO was stopped when the rabbits became comatous,and the cabinet was kept airpoof for 6 h.The rabbits underwent MRI before poisoning,at 1 h,3 d,5 d,7 d,15 d,30 d,45 d,and 60 d after poisoning respectively. Axial and sagittal T_2WI,axial T_1WI and DWI were performed.In the rabbits that did not show symptoms of delayed encephalopathy,the observation was discontinued on the 60~(th)day.In the rabbit that showed the symptoms,the observation was discontinued on the 30~(th)——45~(th)day.The changing pattern of cortical ADC values before and after CO poisoning was observed and its relationship with delayed encephalopathy was investigated.Results In the group without delayed encephalopathy(15 rabbits),the ADC value at 1 h after poisoning[(7.58?0.36)?10~(-4)mm~2/s]decreased significantly compared with the pre-poisoning value[(8.02?0.35)?10~(-4)mm~2/s](q=0.4441,P0.05).In the group with delayed encephalopathy(15 rabbits),the ADC value at 1 h after poisoning [(7.40?0.32)?10~(-4)mm~2/s]decreased significantly compared with the pre-poisoning value[(8.08? 0.32)?10~(-4)mm~2/s](q=0.6728,P

OBJECTIVETo observe the ability of triple helix-forming oligonucleotides (TFOs) modified with manganese porphyrin to combine with and cleave HBV DNA fractions.

METHODSTFO were modified with manganese porphyrin and acridines, and then reacted with the (32)P labeled HBV DNA fragments at 37 degrees C in vitro (pH 7.4). Electrophoretic mobility shift assays and DNase I footprinting tests were used to show the affinity and specificity of TFO to bind to target sequences. The ability of TFO to cleave HBV DNA fragments was tested by cleavage experiments.

RESULTSTFO modified with manganese porphyrin and acridine could bind to the target sequence in a sequence-dependent manner, with a Kd value of 3.5 x 10(-7) mol/L and a relative affinity of 0.008. In the presence of potassium monopersulfate (KHSO(5)), TFO modified with manganese porphyrin and acridine could cleave the target sequence where the triplex DNA was formed.

CONCLUSIONIn the presence of KHSO(5), TFO modified with manganese porphyrin and acridine could bind and cleave the target HBV-DNA in a sequence-dependent manner.

DNA ; drug effects ; pharmacology ; DNA, Viral ; chemistry ; drug effects ; Hepatitis B virus ; genetics ; Manganese ; pharmacology ; Metalloporphyrins ; pharmacology ; Potassium Compounds ; pharmacology ; Sulfates ; pharmacology