Objective To compare the biomechanical stability of the multiaxial inter-vertebral and vertebral pedicle screw fixation in vertebral fracture fixation of the spinal fracture model. Methods Six lumbar fracture models were made on fresh calf lumbar spine specimens at L1 -L5 to compare the stability of four transpedicular multiaxial screws and six transpedicular multiaxial screws by examining the range of motion (ROM) in flexion, extension, lateral bending and torsion. Results Biomechanical experiment found that four multiaxial screws transpedicular fixation specimen exhibited a significantly larger ROM in flexion and extension than the intact specimens; while six multiaxial transpedicular screw fixation specimen exhibited a smaller ROM than the intact specimens (t =4. 844,P ＜0. 01 ;t =3. 722,P ＜0.05 ). The ROM of six multiaxial transpedicular screw fixation specimen was significantly smaller than that of four multiaxial transpedicular screw fixation specimen in flexion, extension, lateral bending and rotation ( P ＜ 0. 01 ). Conclusions Compared with four multiaxial transpedicular screw fixation, six multiaxial transpedicular screw fixation exhibits a significantly larger stability in flexion, extension, lateral bending and rotation, as provides theoretical basis for treatment of thoracolumbar fractures with pedicular screw fixation.

Objective To investigate the influence factors of central venous catheter related infections (CVC-RI) in postoperative patients with gastric carcinoma treated with parenteral nutrition,in order to provide scientific basis for prevention and treatment.Methods Using the retrospective study method,150 patients who treated with parenteral nutrition after operation of gastric carcinoma from December 2013 to March 2014 were selected.Information including age,sex,anamnesis,catheter indwelling time,infusion rate of nutrient solution,and so on were collected.Patients with central venous catheter related infections were set as infection group,patients without infection as the control group,and the group logistic regression analysis was used to analyze the collected data.Results 21 patients in infection group had CVC-RI,and the incidence was 14.00％ (21/150),while 129 patients in control group had CVC-RI.Univariate analysis showed there was significant difference between infection group and control group in age,anamnesis,catheter indwelling time and infusion rate of nutrient solution (x2=17.126,5.447,12.795,7.973,P＜0.05),however there was no significant difference in sex,health insurance,the success rate of catheterization and whether glutamine was in nutrient solution (P＞0.05);the group logistic regression analysis showed that age (OR=15.927,95％CI 3.305-76.756,P＜0.05)and catheter indwelling time (OR=3.511,95％CI 1.028-11.992,P＜0.05) were independent risk factors for CVC-RI,however infusion rate of nutrient solution (OR=0.140,95％CI 0.033-0.597,P＜0.05) was a protective factor.Conclusions For the postoperative patients with gastric carcinoma treated with parenteral nutrition,CVC-RI is closely related to age,catheter indwelling time and infusion rate of nutrient solution.So reducing catheter indwelling time,restoring the enteral nutrition under condition permission as so on as possible can reduce infection of elderly patients.

The anti-hepatitis B virus (HBV) effects and its mechanisms of the ethanol extracts of Hypericum perforatum L. (EHP) in vitro were explored. HepG2 2.2.15 cells, a stable HBV-producing cell line, were cultured as the model system to observe the anti-HBV effect. The viral antigens of cellular secretion, HBsAg and HBeAg, were determined by enzyme linked immunosorbent assay (ELISA). The quantity of HBV-DNA released in the supernatant was assayed by real-time PCR. In order to understand the mechanisms of the suppression of HBV replication, all HBV promoters (Cp, Xp, S1p, S2p and Fp) with luciferase reporter gene were transfected into HepG2 cells respectively. Then the activities of viral promoters were examined by luciferase reporter assay. It was found EHP effectively suppressed the secretion of HBsAg and HBeAg from HepG2 2.2.15 cells in a dose-dependent manner, as well as the extracellular HBV DNA. And EHP could selectively inhibit the activity of HBV promoter Fp. Our data suggest that EHP exerts anti-HBV effects via inhibition of HBV transcription, which helps to elucidate the mechanism underlying the potential therapeutic value of EHP.

Objective To observe the dynamic changes of endothelial progenitor cells (EPC)and vascular endothelial growth factor (VEGF) in the patients with acute myocardial infarction (AMI)after percutaneous transluminal coronary intervention (PCI). Methods The level of VEGF before and after PCI in 50 cases with AMI were determined by fluorescence immunoassay and enzyme-linked immunosorbnent assay (ELISA),and the ratio of EPC in flood was checked by flow cytometry.Results The level of EPC was higher after PCI than before PCI [(4.15 ± 0.22)％ vs.(0.59 ±0.02) ％,P＜0.01],and there were positive correlations between EPC and number of coronary artery disease (r=0.45,P ＜ 0.05 ),coronary artery lesions ( r =0.76,P ＜ 0.01 ),left ventricular enddiastolic diameter (r=0.68,P＜0.01),ejection fraction (r=0.75,P＜0.01).The VEGF levels after PCI was increased [(506± 120)μg/L vs.(204±98)μg/L,P＜0.01],and its level was positively related with coronary lesions (r=0.66,P＜0.01),left ventricular ejection fraction(r=0.90,P＜0.01).There was association between rising rates of EPC and VEGF in a short time after PCI within 24 h period (r=0.56,P＜0.01). Conclusions The clinical efficacy and prognosis can be assessed by the changes of VEGF level and EPC ratio before and after PCI operation in AM1 patients.

Objective To determine the effecting factors for diagnosis of binign or malignant in cystic lesions of pancreas(CLP).Methods One hundred twenty-six patients undergoing operations for CLP or suspected CLP in this hospital from January 1984 to June 2008 were reviewed.Patients were divided into two groups according to lesion's histological features after operation.The predictive effect of various preoperative factors on the malignant potential of CLP was evaluated.Results One hundred twenty-six patients underwent operations for suspected pancreatic cystic neoplasms.There were 89 benign and 37 malignant CLPs.The univariate analysis showed that gender, clinical symptoms(jaundice and weight loss), elevated serum CA199, and presence of one or more of three morphologic features such as solid component, nodule or septation were significantly different between benign and malignant cystic neoplasm of pancreas.The multivariate analysis indicated that imaging features and gender were independent predictors of malignancy.Conclusion In patients with suspected pancreatic cystic neoplasms, elevated serum CA199, clinical symptoms(jaundice and weight loss)and presence of suspicious morphologic features on imaging are predictors of malignant potential of CLP.Patients with a high likelihood of a potentially malignant or malignant lesion based on these three factors should undergo operation without additional investigations.

A method for simultaneous determination of PCDDs, dl-PCBs, BFRs and PBDD/Fs in flue gas from stationary source was developed. The sample was extracted by Soxhlet apparatus with toluene, and followed by purification through sulfuric acid partition and multi-layer silica gel column separation. The target compounds were then all separated by passing through the active carbon-dispersed silica gel column and reversal eluting. Gas chromatography coupled with a thermostable capillary column ( short length, thin stationary phase film) was operated at pulse injection mode. High resolution mass spectrometry set at low-electron-energy ionization was used for quantification. The high- and low-brominated compounds were determined simultaneously. The detection limits of this method were 0. 081-1. 2 pg for PCDD/Fs, 0. 10-0. 32 pg for dl-PCBs, 0. 14-12 pg for PBDEs, 0. 26-16 pg for new BFRs, 0. 44-3. 6 pg for tetra- to hepta-BDD/Fs and 8. 2-12 pg for OBDD/F. Recoveries ( RSDs) in spiked flue gas samples were 88%-115%(2. 9%-6. 1%) for PCDD/Fs, 84%-118% (3. 2%-10%) for dl-PCBs, 71%-135% (2. 1%-18%) for PBDEs, 71%-114% (2. 9%-7. 4%) for new BFRs, 83%-127% (5. 2%-10%) for tetra-to hepta-BDD/Fs and 52%-149% ( 23%-24%) for OBDD/F. All quality control data fell within the acceptable range specified in analysis standards for flue gas.

Objective To investigate the expression levels of the CD14 mRNA and TLR4 mRNA in peripheral blood mononuclear cells from patients with Parkinson disease and to explore the clinical signicance. Methods For?ty-four patients with Parkinson disease and 37 healthy controls were recruited. We recorded age of onset, duration of ill?ness and sex of all recruited patients. PD patients were evaulated using the Hoehn-Yahr stages, Unified Parkinson Dis?ease Rating Scale (UPDRS) Ⅱand UPDRS Ⅲ,non-motor symptoms scale (NMSS) on“off”time. Reverse transcrip?tion-polymerase chain reaction was performed to determine the expression levels of CD14 mRNA and toll-like receptor 4 (TLR4) mRNA. Results The expression levels of CD14 mRNA(1.459±0.658)2-△△CT and TLR4 mRNA (1.408±0.698)2-△△CT was significantly up-regulated (P<0.05) in Parkinson disease compared with controls((1.162 ± 0.631)2-△△CT、(1.122 ± 0.557)2-△△CT). In addition, there was positive correlation between the expression levels of CD14 mRNA in Parkinson dis?ease patients with the Hoehn-Yahr stages. Meanwhile, there was no significant correlation between the expression levels of CD14 mRNA and TLR4 mRNA with other clinical scores. Conclusions There is positive correlation between the ex?pression levels of CD14 mRNA in Parkinson disease patients with the Hoehn-Yahr stages,indicating that CD14/TLR4 positive monocyte may be involved in the pathogenesis of the Parkinson disease.

Objective To establish a uremic apoE-/- mouse model to observe serum biochemical parameters and features of aortic root atherosclerosis (AS) in the model. Methods A uremic model was induced surgically in apoE-/- mice: electrocautery of the right kidney at 8 weeks of age and nephrectomy (NX) of the left one 2 weeks later. Control mice were sham-operated. Two weeks after NX, renal functions were detected in the uremic and control mice to evaluate the efficiency of the model. After 10 weeks of NX, blood samples were taken to determine serum biochemical parameters, and aortic root was collected for frozen sections to investigate the lesion features of AS. Results Two weeks after NX, renal functions declined significantly in the uremic mice compared with the control ones, and remained stable 8 weeks later either in males or in females. Ten weeks after NX, serum levels of TCH, TG and LDL-C were dramatically higher in the uremic mice than in the controls, whereas no differences in serum HDL-C or glucose concentration were found between the two groups. Aortic root plaque relative area increased significantly in the uremic mice compared with the controls either in males or in females; more-over, the lesion area was larger in female mice than in male ones. Conclusion We established a uremic apoE-/- mouse model successfully, and this model is characterized by accelerated atherogenesis which is associated with an increase in serum lipid profile. This experimental model can be a useful tool to study the pathogenesis and therapeutic strategies of uremic AS.

A fused functional gene of human OPG and Mhsp65 was amplified by PCR,and cloned into the prokaryotic expression vector pET-28a.The BL21(DE3) strain of E.coli was transformed using the recombinant plasmid pET-28a-OPG-HSP65 and the expected protein was expressed by induction with IPTG.Result of SDS-PAGE indicated that the expected recombinant protein of 23 kDa was expressed with high yield as inclusion body.The fusion protein could be specifically recognized by both the anti-His antibody and anti-human OPG monoclonal antibody in Western blot analysis.The purified and refolded fusion protein could inhibit osteoclast proliferation and bone absorption in vitro.The results of mouse ear swelling assay and expressions of TNF-?,IFN-? and IL-17 mRNAs detected by real-time quantitative PCR demonstrated that the fusion protein had an anti-inflammation activity.The results suggest that the fusion protein of human OPG and Mhsp65 may act as a potential therapeutics for rheumatoid arthritis.

Poly (2-ethylacrylic acid) (PEAA) alkylamide derivatives were synthesized for constructing pH-sensitive liposomes by partially modification of carboxylic groups of PEAA with chemical reaction. These lipid derivatives of PEAA were synthesized by partially modification of carboxylic groups of PEAA with alkylamines. The acid-sensitive polymer associated liposomes were obtained by the method of polymer self-insertion in aqueous solutions through inserting hydrophobic lipid anchors of the polymer PEAA derivatives into the outer layer of vesicles. Factor effects on polymer insertion into liposomes were evaluated and the pH-sensitivity of the polymer associated liposomes was studied by calcein release assay. The PEAA-assoeiated-liposomes were prepared successfully by the methods of self-insertion. The PEAA-associated-liposomes are shown to be stable at neutral pH. (1) There was no correlate of anchor density of PEAA with length of the alkyl chain, but was positively correlated with the degree of PEAA modification. (2) Polymer insertion increased with initial ratio of polymer to lipid. (3) Unerting hydrophobic lipidr acidic conditions the associated polymer induces membrane disruption and fusion. (4) The PEAA-associated-liposomes shown pH-sensitive drug release property under acidic conditions. The anchored-poly (ethylacrylic acid) lipid derivatives can be useful in developing a potential pH sensitive drug delivery system.
Acrylates ; chemical synthesis ; pharmacokinetics ; Animals ; COS Cells ; Cercopithecus aethiops ; Drug Delivery Systems ; methods ; Fluoresceins ; metabolism ; Hydrogen-Ion Concentration ; Liposomes ; chemistry ; pharmacokinetics ; Particle Size ; Polyunsaturated Alkamides ; chemical synthesis ; pharmacokinetics