Abstract?AIM:To investigate the clinical effect of orthokeratology for 400 juvenile with myopia astigmatism and its effects on corneal endothelial cells.?METHODS:Four hundred patients(800 eyes), of whom the average age was 11.5 ±2.3 years old, 239 male, 161 female, were divided into two groups: orthokeratology group and spectacles group. Parameters including efficacy data ( uncorrected visual acuity, corneal curvature, axial length and diopter ) and corneal endothelial cell data ( count of endothelial cell, endothelial cell density, fluorescein staining and central corneal thickness) were observed at 1d, 1, 6, 12 and 24mo after wearing.? RESULTS: The visual acuity of spectacles group recovered to normal after wearing, that of orthokeratology group recovered to normal at 1mo after wearing.At 2a after wearing, the corneal curvature, diopter of orthokeratology group decreased significantly (40.09 ±0.31D, 0.23 ±0.06D respectively); while those of spectacles group increased, the differences between the two groups were significant (P<0.05).The axial length of the two groups increased slightly at 1mo after wearing ( P>0.05 ) compared to those before wearing. At 2a after wearing, the axial length of the two groups were 23.96 ± 0.38mm, 26.49±0.88mm respectively (P<0.05).At 2a after wearing, central corneal thickness was 527.33 ± 27.69mm, 526.98±26.89μm(P>0.05).The count of endothelial cell and endothelial cell density both decreased after wearing without significant differences (P>0.05).?CONCLUSION: Orthokeratology has less effect on the corneal endothelial cells, no obvious adverse reactions and can control the prognosis of myopia.

Salmonella enterica serovar Cerro 87, which was isolated from a commercial egg-producing farm, has a phosphorothioated DNA backbone resulting DNA degradation(Dnd) during the pulsed field gel electrophoresis (PFGE) process. In this research, a gene deletion mutant XTG103 was engineered with the entire dnd gene cluster knocked out by double crossover using vector pKOV-kan, and lost Dnd phenotype corre- spondingly. We regulated the DNA phosphorothioation by heterogenous expression of dnd gene cluster with an isopropyl ?-D-1-thiogalactopyranoside (IPTG) inducible promoter PlacZ.

Objective To study the effects of angiotensin converting enzyme inhibitor benazepri1 on apoptosis and the expression of Fas and FasL in the kidney of rats with adriamycin-indued nephritic glomeruosclerosis.Methods After uninephrectomy and the injection of adriamycin induced rats model with glomerulosclerosis, benazapril(6 mg/kg) was delivered daily by gavage to the rats in therapeutic groups for 12 weeks.Apoptosis was examined by means of terminal-deoxynucleotidyl trans ferase mediated d-UTP nick end label ling(TUNEL) and immunohistochemistry was utlized to detect the expression of Fas and FasL.Software of pathological analysis quantitated the level of Fas and FasL.Results Compared with those of the control group, the kidney of model group had moresevere glomerulosclerosis, much more apoptotic cells and higher level of exprssion of Fas and FasL. The degree of glomeruloscleroais, the nuxner of apoptotic cells and the level of expression of Fas and FasL were ameliofated by benazepril treatment.Conclusion Benazepril may suppress the excessive apoptosis of kidney cell by lowering the expression of the protin correlatng apoptosis Fas and FasL,so as to postpone the process of glomeruosclerosis.

pHZ1080, an E. coli-Streptomyces shuttle expression vector was constructed in order to explore the utilization of lambda phage regulated expression elements in Streptomyces. A 2.7 kb polyketide synthase (PKS) gene from Streptomyces sp. FR-008 was inserted into downstream of lambda phage promoter (PR) to give the shuttle plasmid, pHZ1067. The PKS protein was expressed in Streptomyces lividans carrying pHZ1067 in a heat-dependent manner, as it did in E. coli. The PKS protein expressed in both hosts with same molecular weight was detected by SDS-PAGE and Western-blot. The successful heat-induced expression of PKS suggested that pHZ1080 was useful and convenient for heat-induced expression of heterologous genes in both E. coli and Streptomyces.
Amino Acid Sequence ; Base Sequence ; Blotting, Western ; Cloning, Molecular ; Genetic Vectors ; genetics ; Molecular Sequence Data ; Multienzyme Complexes ; genetics ; metabolism ; Recombinant Proteins ; genetics ; metabolism ; Streptomyces ; enzymology ; genetics ; Temperature

OBJECTIVE: To investigate the effect of placement of peripherally inserted central catheter (PICC) via the upper versus lower extremity veins in neonates through a Meta analysis. METHODS: CNKI, Wanfang Data, VIP Data, CBMdisc, PubMed, Web of Knowledge, Embase, Medline, Cochrane Library and Google Scholar were searched for control studies on the effect of PICC placement via the upper versus lower extremity veins in neonates. RevMan 5.3 was used to perform a Meta analysis of the studies which met the inclusion criteria. RESULTS: A total of 18 studies were included, among which there were 8 randomized controlled trials and 10 cohort studies, with 4 890 subjects in total. Compared with those undergoing PICC placement via the upper extremity veins, the neonates undergoing PICC placement via the lower extremity veins had significantly lower incidence rates of complications (RR=0.83, 95%CI: 0.75-0.92, P<0.05), catheter-related infections (RR=0.77, 95%CI: 0.60-0.99, P<0.05), catheter malposition (RR=0.28, 95%CI: 0.18-0.42, P<0.05), extravasation of the infusate (RR=0.52, 95%CI: 0.40-0.70, P<0.05), and unplanned extubation (RR=0.82, 95%CI: 0.69-0.98, P<0.05). They also had a significantly higher first-attempt success rate of puncture (RR=1.17, 95%CI: 1.05-1.30, P<0.05) and a significantly shorter PICC indwelling time (MD=-0.93, 95%CI: -1.26-0.60, P<0.05). CONCLUSIONS The above evidence shows that PICC placement via the lower extremity veins has a better effect than PICC placement via the upper extremity veins in neonates.
Catheterization, Central Venous ; Catheterization, Peripheral ; Cohort Studies ; Humans ; Infant, Newborn ; Lower Extremity ; Retrospective Studies

Objective To explore the relationship of central obesity and brain-derived neurotrophic factor (BDNF) expression in skeletal muscle.Methods Fifty healthy kunming mice at the neonatal stage were randomly divided into control group (n =20 cases) and test group (n =30 cases).To obtain the obese models,test group mice were injected with 10％ monosodium glutamate (3 mg · g-1 · d-1)for 5 days at cervical subcutaneous.In addition,mice were removed according to the requirements.Finally,we got 12 mice in each group.We detected body weight of the mice every two weeks,then Lee' s index was calculated.Body temperature was detected per week.At the end of 8th week,the blood specimens was collected from the eyeball to detect the serum lipid using automatic biochemistry analyzer.The perirenal white adipose tissue (WAT) and interscapular brown adipose tissue (BAT) were isolated and weighed.Furthermore,the levels of BDNF in skeletal muscle were investigated through western blotting in order to analyze the relationship between BDNF with central obesity.Results At the 6th weekend,the body weight of test and control groups were (39.71±2.55) and (32.83 ±2.30)g,the Lee's indexes were (365.02 ±3.83) and (337.54±4.10) g1/3 · cm-1,at the 8th weekend,the body weight of test and control groups were (48.12 ± 3.61) and (39.51 ± 3.52)g,the Lee's indexes were (361.93 ± 7.12) and (325.17 ± 6.87)g1/3 · cm-1 Above indexes had significant difference between the two groups (P ＜ 0.05,P ＜ 0.01 or P ＜ 0.001).At the 6th weekend,the temperature of the two groups were (36.30 ± 0.07) and (36.67 ± 0.07) ℃,at the 7th weekend,the temperature of the two groups were (36.40 ±0.08)and (36.79 ± 0.10)℃ respectively,at the 8th weekend,the temperature of the two groups were (36.31 ± 0.09)and(36.80 ± 0.10)℃ respectively.Above indexes had significant difference between the two groups.At the 8th weekend,the main indexes in test and control groups were compared:the total cholesterol were(2.91±0.25) and (1.86 ± 0.51) mmol · L-1,the triglyceride were (1.48 ± 0.62) and (0.81 ±0.23)mmol · L-1,the low-density lipoprotein were (0.37 ± 0.06) and (0.29 ± 0.05) mmol · L-1,the WAT were (0.75 ± 0.08) and (0.24 ± 0.05) g,the BAT were (0.31 ± 0.07) and (0.17 ±-0.01) g,the value of the BAT/WAT were (0.41 ±0.08) and (0.71 ± 0.12),the expression of BDNF were (0.63 ± 0.07) and (0.98 ± 0.06).The differences were statistically significant (P ＜ 0.05,P ＜ 0.01 or P ＜ 0.001).Conclusion Down-regulation of BDNF in skeletal muscle may be involved with central obesity of mice by affecting energy metabolism.

BACKGROUNDThe application of pulmonary valved conduit to reconstruct the continuity between right ventricles and pulmonary artery is one of the major surgeries. This study aimed to establish an in vivo model of in situ implantation using pulmonary valved conduit in large animals under off-pump condition to validate the long-term effects of artificial pulmonary valved conduit.

METHODSDomesticate juvenile male sheep and tissue-engineered porcine pulmonary valved conduit were used for the experiment: 30 sheep, weighing (15 ± 3) kg (range 13 to 17 kg) were randomly divided into two groups which were all operated under general anesthesia by off-pump surgery (group 1) and left thoracotomy (group 2). Two different off-pump surgical methods were used to perform cannulation in sheep pulmonary artery to replace part of sheep pulmonary artery with pulmonary valved conduit which will work together with sheep pulmonary artery and valves. During the experiments, animal survival, complication rates, operating time and blood loss were recorded to compare the results between groups and to establish a surgical method with minimal invasion, simplicity, safety, and high success rates.

RESULTSIn group 1, a total of 15 cases of surgeries were performed, in which two sheep died; the operative mortality was 13.3% (2/15). In group 2, a total of 15 cases of surgeries were performed, and the surgical mortality rate was 0 (0/15). The operation time and blood loss in group 2 was significantly better than that in group 1. The postoperative echocardiograms showed that, after the surgeries by these two methods, the blood flows were normal, and the valves can open and close freely. Autopsy after 6 months showed that the inner wall and the valves of pulmonary valved conduit were smooth with no thrombus formation.

CONCLUSIONThese two off-pump methods are feasible and safe with fewer traumas; but the second method is better and particularly suitable for the establishment of a juvenile animal model.

Animals ; Heart Valve Prosthesis ; Male ; Pulmonary Valve ; Sheep ; Swine ; Tissue Engineering

OBJECTIVETo investigate the effects of lentivirus mediated siRNA targeting human metastasis suppressor 1 (MTSS1, MIM-B gene) gene on the invasive and metastatic potentials of hepatocellular carcinoma (HCC) MHCC97H cells.

METHODSThe siRNA targeting MTSS1 was cloned into one lentivirus work vector. The work vector and three package plasmids were co-transfected into 293T cells with the help of lipefeetamine 2000. Lentivirus was collected in 72 hours and was added to the cultured MHCC97H cells. The total cell MIM-B mRNA and MIM-B protein were extracted and underwent real-time PCR and western-blot test respectively. Boden chamber assay was used to evaluate the invasive potential of MHCC97H cells. Gelatin zymography was used to detect matrix metalloproteinase-2 (MMP2) activity. Metastatic human HCC nude mice models were established by orthotopic implantation with a high metastatic potential human HCC cell line MHCC97H. Twenty-four nude mice bearing orthotopic xenografts were randomized into black control group, Lenti-GFP group and intervention group (Lenti-MTSS1 group) 14 days after orthotopic implantation (8 per group). The ultrasound-guided multi-point injection was performed on mice with borate buffered saline, Lenti-GFP and Lenti-MTSS1 respectively. Mice were sacrificed on day 35 for the examination of pulmonary metastasis. The SPSS 13.0 soft ware was applied to data analysis.

RESULTSThe small interfering RNA targeting MTSS1 was constructed successfully with a transfection efficiency of 97.0%, which produced a marked inhibition of invasive ability of MHCC97H cells through Matrigel, being 37.9+/-4.4, 37.4+/-5.3 and 26.6+/-4.6 in the black control group, Lenti-GFP group and Lenti-MTSS1 group (F = 26.695, P value is less than 0.01), respectively. MIM-B expression and MMP2 activity of intervention group were also significantly down-regulated as compared to the control group. The results of in vivo studies showed that the numbers of lung metastatic nodules were 6.5+/-2.6, 6.4+/-2.7 and 3.8+/-1.3 in the black control group, Lenti-GFP group and intervention group respectively with significant statistical difference (F = 3.637, P value is less than 0.05), accorded with tumor tissue MIM-B mRNA expression of 0.39+/-0.19, 0.38+/-0.10 and 0.16+/-0.11 respectively (F = 11.644, P value is less than 0.01) when comparison was made between control group and therapy group.

CONCLUSIONSmall interfering RNA mediated by lentivirus inhibited MIM-B expression and resulted in inhibition of the invasive and metastatic potentials of MHCC97H cells, which may attributed, in part, the down regulation of MMP2 activity, and thus may provide a new molecular targeted therapy for HCC patients in the future.

Animals ; Carcinoma, Hepatocellular ; genetics ; pathology ; Cell Line, Tumor ; Humans ; Matrix Metalloproteinase 2 ; metabolism ; Mice ; Mice, Inbred BALB C ; Mice, Nude ; Microfilament Proteins ; genetics ; Neoplasm Proteins ; genetics ; Neoplasm Transplantation ; RNA, Small Interfering ; genetics ; Transfection

To investigate the influence of vasoactive intestinal peptide (VIP) on chemotaxis of bronchial epithelial cells (BECs). Rabbit chemotactic migration of primary BEC was assessed in a blind-well Boyden chamber. Radioimmunoassay and radio-ligand affinity analysis were used for determining VIP secretion and vasoactive intestinal peptide receptor (VIPR) expression. The results showed: (1) the method for determining chemotaxis of BECs by using insulin as chemotactic factor was stable and reproducible (r=0.9703, P<0.01). (2) VIP (0.001-1 micromol/L) elicited chemotaxis of BECs which was substantial and concentration-dependent. The effects of VIP were inhibited by W-7 and H-7 (P<0.01). (3) Heat stress enhanced the secretion of VIP (P<0.01) and upregulated the expression of VIPR on BECs (P<0.05). These results indicate that VIP in the lungs may play an important role in the repair of damaged epithelium, accelerating restoration of the airway to its normal state. Calmodulin and protein kinase C may be involved in the signal transduction of VIP effects.
Animals ; Bronchi ; cytology ; Cells, Cultured ; Chemotaxis ; drug effects ; physiology ; Epithelial Cells ; drug effects ; physiology ; Female ; Insulin ; pharmacology ; Male ; Rabbits ; Receptors, Vasoactive Intestinal Peptide ; biosynthesis ; Vasoactive Intestinal Peptide ; pharmacology