AIM: To investigate if hydrogen peroxide may alter COX-2 gene expression in pulmonary artery endothelial cells(PAECs) and how CaMKⅡ functions in this process.METHODS: Cultured pulmonary arterial endothelial cells were treated with different concentrations of hydrogen peroxide for different durations.The cells survival rates were measured by CCK-8 after the cells were treated by hydrogen peroxide.The level of COX-2 mRNA and protein were measured by RT-PCR and Western blotting,respectively.RESULTS: The results showed that hydrogen peroxide up-regulated COX-2 mRNA and protein levels in a concentration-and time-dependent manners.Incubation with 100 ?mol/L H2O2 for 4 h increased COX-2 mRNA and protein level to 256.01%?22.36%(P

Some studies on nocardiosis in cultured fish were critically reviewed,including pathogenic bacterium,taxonomy,pathogenicity,histopathologically,diagnosis,controlling method and immunology. Some problem and advice on this disease were suggested.

To further explore the result of bilingual teaching in pediatrics,we randomly chose 200 undergraduates of 4 class and released students'questionnaires about bilingual teaching with teaching content before and after class to assess students'understanding of bilingual teaching and analysed appraisal result.We found no significant difference of student score between students accepting bilingual teaching and not accepting the bilingual teaching,but there was difference for English tests and expression level.So we think that students can fully accept the bilingual teaching of pediatrics under the premise with selecting appropriate teaching methods and means.

Background Whether the wearing of bifocal lenses can delay the development of myopia in school childhood is in controversy.To assess the effect of bifocal lenses using evidence-based medicine method is of important significance.Objective Present study was to compare the effect of bifocal lenses with single vision lenses in retarding myopia progression in school-aged myopic children.Methods This was a evidence-based medicine study.The systematical literature search was performed from MEDLINE(1966 to October 2010),EMBASE(1974 to October 2010),Cochrane Library,Chinese Biomedical Database(1978 to October 2010),and Chinese Clinical Trial Registry combined with hand searching of related bibliographies of journals and books were applied to collect the randomized-controlled clinical trial about bifocal lenses.Screening,evaluation and data extraction of the retrieved literature were performed by two investigators independently.Mata-analysis was used to assess the progression of refraction and axial length among included randomized clinical trials.Results Three high-quality randomized-controlled clinical trials meeting the inclusion criterion were included in this meta-analysis.The results showed that the weighted mean difference in progression of refraction was 0.22D between bifocal lenses and single vision lenses(95% CI:-0.24-0.67),and the difference was statistical insignificance(P=0.35).The weighted mean difference in progression of refraction during the follow-up durations of 6,12,18,24 and ＞30 months were 0.15(95% CI:-0.09-0.38),0.17(95% CI:-0.05-0.39),0.42(95% CI:-0.14-0.98),0.23(95% CI:-0.21-0.66) and 0.03(95% CI:-0.40-0.46),respectively without statistical significance.The weighted mean difference in elongation of axial length between two interventions was -0.17mm(95% CI:-0.26-0.08) with a statistically significance(P=0.000).Conclusion Based on currently available studies,bifocal lenses could not significantly slow the progression of myopia in myopic school-aged children in comparison with single vision lenses.Because only few high-quality studies are currently available,this conclusion need to be supported by more large-sample-size clinical trials.

Brain Stem/pathology* ; Death, Sudden/etiology* ; Fatal Outcome ; Humans ; Intracranial Hemorrhages/mortality* ; Leukemia/pathology*

Objective To isolate enterovirus 71 from a death children,and analyze whether the neurovirulence was related to the variation of nucleotide and amino acid. Methods Enterovirus 71 was isolated from throat swabs which were colleted from Shandong Linyi People's Hospital. The full length genome was sequenced by amplification with RT-PCR and sequencing of 9 overlapped gene fragments covering full length of the genomes. The nucleotide and amino acid sequenced was aligned by BLAST, Bioedit and MEGA 4. Results A strain of enterovirus 71 was isolated and named as SDLY107. The full length was 7405 bp. The results of homology analysis of overall nucleotide sequence showed that strain Fuyang. Anhui. P. R. C/17.08/2 had highest homology (98.6%)with strain SDLY107, and the homology was 80.0% between strain SDLY107 with prototype strain BrCr/70,and 86. 5% between strain SDLY107 with nerve strain MS/87. Phylogenetic analysis showed that the phylogeny was close between SDLY107 with some isolated strains from Chinese Mainland, such as Beijing, Henan, Guangxi, Sbenzhen, Lanzhou, Fuyang, Chongqing and Zhejiang strains, which was clustered for C4 subtype. The results of amino acid sequence analysis showed that there were 2 mutations, E947D and K1873R, for strain SDLY107. Conclusion SDLY107 belonged to C4 subtype, amino acid mutations E947D and K1873R of which may be relevant to the pathogenicity of EV71.

AIMTo study the pharmacokinetics of genistein at different doses in Beagle dogs.

METHODSSuspended in 0.5% CMC-Na solution, genistein was orally administered to Beagle dogs at doses of 2.67, 5.34 and 10.68 mg.kg(-1). At various time intervals, 1.5 mL of blood was drawn from the femoral vein of dogs in their front legs. The plasma was treated with beta-glucuronidase. The genistein in plasma was extracted twice by vortexing with 2.0 mL mixture of methyl tert-tubtyl ether and pentane (v/v = 8:2). The organic phase was removed into the tubes and then evaporated in ventilation cabinet. The residue was dissolved in 50 microL of methanol. 20 microL solution was drawn and detected by high-performance liquid chromatography. The pharmacokinetic parameters were calculated by 3P97 software.

RESULTSThe plasma drug concentration-time data were fitted to the two-compartment model. When the dose was 2.67 mg.kg(-1), the MRT and AUC of parent compound were 52.9 min and 6.7 mg.min. L(-1), respectively. When the dose rose to 5.34 mg.kg(-1), the MRT and AUC of parent compound became 224.8 min and 26.1 mg.min.L(-1), respectively. However, when the dose increased to 10.68 mg .kg(-1), the MRT and AUC of parent compound increased to 267.7 min and 33.2 mg.min L(-1), respectively. The AUC of glucuronidated genistein was 33.9, 70.1 and 140.5 mg.min.L(-1) at the dose of 2.67, 5.34 and 10.68 mg.kg(-1), respectively.

CONCLUSIONDue to significant first pass metabolism, the drug was mainly existed in the form of glucuronidated genistein in the plasma. With the increase of dose, the absorption of genistein became saturated and the half life prolonged.

Animals ; Anticarcinogenic Agents ; administration & dosage ; blood ; pharmacokinetics ; Area Under Curve ; Dogs ; Dose-Response Relationship, Drug ; Female ; Genistein ; administration & dosage ; blood ; pharmacokinetics ; Glucuronides ; blood ; pharmacokinetics ; Male

Objective To investigate the influence of 18F-FDG on the proliferation of Lewis lung cancer cell line,and to elucidate its possible mechanism.Methods Morphological changes of cells after culture for 24 h at different concentrations of 0,0.37,1.85,3.70 and 7.4 (×106) Bq/ml of 18F-FDG were observed by using inverted microscopy and electron microscopy.The apoptosis and phase distribution of cell cycle of irradiated cells were analyzed with flow cytometry.DNA synthesis of irradiated cells was assayed by 3H-TdR incorporation.Lipid peroxidation was measured by chromometry and expression of Bcl-2 and Bax protein was measured by immunohistochemical technique.Results Exposed to (0-7.40) × 106Bq/ml of 18F-FDG for 24 h,the cumulative absorbed doses delivered to cells in five groups were 0,0.11,0.55,1.10 and 2.20 Gy,respectively.Irradiated cells showed morphological changes of apoptosis.The apoptosis rate of irradiated cells was increased from (4.05 ± 0.01)% to (25.6 ± 0.28) % (t = 188,P＜0.01).3H-TdR incorporation rate was decreased from 100% to(22.0 ± 0.51)% (t =27.6,P ＜0.05).The levels of M DA in cells were augmented from (0.08 ± 0.03) to (0.67 ± 0.12) μmol/L (t =11.7,P ＜ 0.01).Cell cycle arrest was found in G2/M phase with the increasing doses from 0 to 2.20 Gy.The expression of Bcl-2 protein was decreased while that of Bax protein increased.Conclusions 18F-FDG could induce the apoptosis of cells and inhibit the proliferation of cells.

Objective To investigate the distribution frequency of allele genetic polymorphism of drug-metabolizing enzyme CYP2C19?2 (rs4244285) in tumor patients of Han population from Hubei province,to provide guidance for clinical rational drug use related to the genetic polymorphism. Methods CYP2C19?2 genotyping was performed by Fluorescence Dye Terminator Cycle Sequencing System in 285 cancer patients. Genotype frequency and allele frequency were calculated and the genotype distribution in different genders was compared. Compared with the previous studies, we clarified the frequencies of CYP2C19?2 gene polymorphisms in different nationalities. Results All the 285 patients in this study were Han population. The genotype frequency of CYP2C19?2 was 113 (39.6%),138 (48.4%) and 34 (11.9%) for wild-type homozygote (GG), heterozygote (GA) and variant homozygote (AA),respectively.The CYP2C19?2 mutant allele frequency was 36.1%.Genotype distribution of male and female patients did not reach significant difference. Conclusion There is no difference in CYP2C19?2 genotypes distribution among different ethnic groups.

·Age-related macular degeneration (AMD) and retinitis pigmentosa (RP) are common outer retinal degenerative problems, which are also the predominant causes of most blinding retinal diseases. Retinal prosthesis is a promising solution for such photoreceptor degeneration diseases.Most of current concepts for a retinal prosthesis are based on neuronal electrical stimulation. In the past twenty years, retinal prosthesis has been developed in two different directions: epiretinal prosthesis and subretinal prosthesis. Each prosthesis technique has its advantages and disadvantages. For epiretinal prosthesis, it is easier to be implanted and has the advantage of keeping most of the electronics in the vitreous cavity, off the retinal surface, which greatly helps in dissipating the heat generated by the implant device. In this paper, a brief overview of retinal prostheses concepts is introduced. After that, several important aspects of epiretinal electrical stimulation will be discussed. Moreover, some practical epiretinal prosthesis devices developed by researchers in United States, Germany and Japan in the past have been reviewed. We hope that the devices will be used widely in the near future.