Objective To explore the optimal situation of labeling bone mesenchymal stem cells (BMSCs) with superparamagnetic iron oxides (SPIO) mediated by poly-L-lysine (PLL), and determine the most optimal protocol of magnetic resonance imaging according to the patterns of MR in vitro. Methods BMSCs were isolated from white rat and purified, incubated with SPIO-PLL complexes at the range of concentrations (0, 4.2, 8.4, 21, 42, 84 ?g Fe per ml medium). The labeling ratio and distribution of SPIO particles in BMSCs, and the morphological evidence of abnormal visualization were evaluated by Prussian blue staining, fluorescent microscope and electron microscopy. MTT growth curves and magnetic resonance imagings were obtained at the range of concentrations. Trypan blue exclusion test was performed to elevate the viability of BMSCs labeled with PLL at the range of concentrations (0, 0.05, 0.25, 0.5, 1.0, 5.0 ?g PLL per ml medium). Results The cellular labeling ratio was strongly correlated to the concentrations of SPIO (P

BACKGROUND: As magnetic resonance (MR) contrast, a large number of clinical and experimental researches have been done on superparamagnetic iron oxide (SPIO), while the report on the labeled cell passaged cells is rare.OBJECTIVE: MR imaging was performed to the labeled bone mesenchymal stem cells (BMSCs) and its passaged cells in vitro, in order to establish the base of monitoring magnetic labeled BMSCs with magnetic resonance imaging (MRI) in vivo.DESIGN, TIME AND SETTING: The cytological in vitro experiment was performed at the Imaging Research Institute and Institute of Rheumatology and Immunology of North Sichuan Medical College Hospital from June 2006 to January 2007. MATERIALS: Two clean female albino rats (Animal Center, North Sichuan Medical College), SPIO (Schering AG,Germany) were used in this study.METHODES: Bilateral femur and tibia bone marrow was extracted from rats. BMSCs were harvested and purified using the adherent method, and then labeled with 600 μL ferric oxide-polylysine compound (42 mg/L iron concentration) in vitro. MAIN OUTCOME MEASURES: Cell maker-positive rate and the MR signal intensity were respectively measured to the labeled cells and its passaged cells under the inverted microscope and magnetic resonance imaging. RESULTS: Following Prussian blue staining, labeling rate of SPIO labeled cells at the first passage was 100%. With increased passage, the labeling rate was reduced from the first to fifth passages. Compared with non-labeled PBS control, there was no significant difference in signal intensity in the first and second passages cells, but the signal intensity percentage was gradually decreased with signal intensity of increased cell passage from the third passage. Cell labeling rate was negatively correlated with T2~*WI signal intensity (r=-0.986 6, P <0.005). CONCLUSION: The iron particles in the magnetic labeled cells can be passaged to the offspring cells, and can be monitored in a certain period of time with MRI in vitro. These results firstly introduced that SPIO-labeled cell iron particles can decrease with cell passage.

Fungal polyketide synthases are responsible for the biosynthesis of secondary metabolites such as pigments, mycotoxins, and they are very important in pharmacology , food science and agriculture. The recent advances in the methods for the isolation and manipulation of multiple classes of polyketide synthase genes from fungi were introduced. It is useful for discovery of novel fungal polyketide synthase gene clusters. These methods can also be useful for revealing the genetic potential of fungi to produce multiple types of bioactive polyketide.

Objective To investigate the effect of matrix metalloproteinases(MMPs) in ventilator-induced lung injury inflammatory reaction of newborn rabbits.Methods Seventy-five newborn rabbits aged 1-5 days were randomly arranged to 3 groups:control group(n=3),other 72 rabbits designed by 2?2?3 factorial were divided into high concentration oxygen(100%)and low concentration oxygen(45%) groups,and each group was subdivided into 2 groups:High peak inspiratory pressure(PIP)group and low PIP group.All rabbits were done by mechanical ventilation and killed to obtain lung tissue at 1,3,6 hours after trailing respectively.The concentration of MMP-9 and MMP-2 in lung tissue bomogenate were detected by ELISA,at the same time the ratio of wet to dry was detected and pathological section was analyzed.Results 1.The concentration of MMP-2 in high concentration oxygen group,high PIP group and low PIP group increased compared with that in normal group,and there were significant differences.2.The mean concentration of MMP-9 was lower in high concentration oxygen group than that in normal control group,and there was significant difference between 2 groups.The mean concentration of MMP-9 in low concentration oxygen group was higher than that in normal group,and there was no significant difference between 2 groups.There was no significant difference in effect to mean concentration of MMP-9 by different PIP.3.There were positive correlation between MMP-2 and MMP-9,MMP-2 and the ratio of wet to dry in lung.Conclusions Within 6 hours in newborn rabbits by mechanical ventilation,ventilation with high concentration oxygen up-regulate MMP-2,but down-regulated MMP-9.The lungs stretch by mechanical ventilation increase MMP-9,but decrease MMP-2.Mechanical ventilation can affect the synthesis of MMPs,and MMPs plays an important role in ventilator-induced lung injury of newborn rabbits.

OBJECTIVETo evaluate the efficacy and safety of three antithrombotic agents on venous thromboembolism (VTE) after unilateral total knee arthroplasty.

METHODSFrom November 2011 to March 2014, 149 patients undergoing unilateral total knee arthroplasty for knee osteoarthritis were reviewed. Among them, there were 66 males and 83 females, ranging in age from 48 to 76 years old. All the cases were randomly divided into three groups including Aspirin group, low-molecular-weight heparin (LMWH) group, and rivaroxaban group, according to antithrombotic agents. Deep vein thrombosis (DVT), pulmonary embolism (PE) and bleeding complication (including wound ecchymosis, hematoma and other local complications, gastrointestinal, cardiovascular, urinary hemorrhage and other major bleeding events) of antithrombotic agents were observed and analyzed statistically at the 6 week, 8 week, and 12 week after operation.

RESULTSAmong patients who received Aspirin (48 cases), 4 patients had DVT, in 1 patient had PE, and 2 patients had bleeding complication. Among 54 patients in low-molecular-weight heparin group, 3 patients had DVT, 1 patient had PE, and 3 patients had bleeding complication. While among those patients received the rivaroxaban (47 cases), 3 patients had DVT, 0 patient had PE, and 11 patients had bleeding complication. There were no statistically differences among three groups on DVT, and PE (P>0.05). The incidence of bleeding complication in rivaroxaban group was higher than the other two antithrombotic agents, and the difference among the three groups was statistically significant (P<0.05).

CONCLUSIONAspirin, low-molecular-weight heparin, and rivaroxaban could effectively reduce the incidence of VTE after total knee arthroplasty, and their efficacy was similar. Rivaroxaban has a higher incidence of bleeding complication and further clinical trials are required to be conducted to assess the safety of rivaroxaban in clinical.

Aged ; Arthroplasty, Replacement, Knee ; adverse effects ; Aspirin ; therapeutic use ; Case-Control Studies ; Female ; Fibrinolytic Agents ; therapeutic use ; Heparin, Low-Molecular-Weight ; therapeutic use ; Humans ; Male ; Middle Aged ; Postoperative Complications ; prevention & control ; Rivaroxaban ; therapeutic use ; Venous Thromboembolism ; prevention & control

A stimulate method for determination of polybrominated diphenyl ethers ( PBDEs) and derivatives (OH-PBDEs and MeO-PBDEs), tetrabromobisphenol A (TBBPA), hexabromocyclododecane (HBCD) in egg samples was developed by gel permeation chromatography ( GPC) and dispersive solid phase extraction ( DSPE) combined with liquid chromatography tandem mass spectrometric ( HPLC-MS/MS) and gas chroma-tography-negative chemical ionization mass spectrometry ( GC-NCI/MS ) . The analytes were extracted with mixture of hexane and dichloromethane (1∶1, V/V) by accelerated solvent extraction (ASE), and purified by 100 mg C18 dispersive solid phase extraction ( SPE) sorbents followed with gel permeation chromatography (GPC) , and then analyzed by liquid chromatography tandem mass spectrometric (HPLC-MS/MS) and gas chromatography-negative chemical ionization mass spectrometry (GC-NCI/MS), respectively. The quantita-tion was carried out external standard method. The recoveries of objects were 64. 5%-97. 2% and 65. 6%-109 . 2% ( except BDE85 was 54 . 8%, OH-BDE-137 was 47 . 4%) spiked at 1 . 0 μg/kg or 5 . 0 μg/kg in egg white and egg yolk, respectively. The relative standard deviations (RSDs) were less than 20. 2%. The limits of quantitation (LOQ) for the object were 0. 01-0. 2 μg/kg.

AIM: To systematic review the effectiveness of refractive multifocal intraocular lens ( MIOL ) ReZOOM vs diffractive MIOL ReSTOR in the treatment of cataract.
METHODS: Randomized controlled trials comparing refractive MIOL ReZOOM with diffractive MIOL ReSTOR were identified by searching CENTRAL, MEDLINE, EMbase, WANFANG MED ONLINE, CMJD, SinoMed, and CNKI. Related journals also were hand-searched. Methodological quality of randomized controlled trials ( RCTs ) was evaluated by simple evaluate method that recommended by the Cochrane Collaboration. Data extracted by two reviewers with designed extraction form. RevMan software ( release 5. 2 ) was used for data management and analysis.
RESULTS:A total of 7 trials (846 eyes) were included for systematic review. Subgroup analyses were used according to different model comparison of ReSTOR MIOL. The results showed a significant difference in the mean of the best distance corrected intermediate visual acuity ( BDCIVA) in the ReZOOM MIOL group with WMD=-0.11, 95% CI (-0.16, -0.06) (P<0.0001). It showed a significantly difference in the mean of the uncorrected near visual acuity ( UCNVA ) , complete spectacle independent rate, halo rate and glare rate in the ReSTOR MIOL group with WMD= 0. 09, 95% CI (0. 05, 0. 14) (P<0-00001), WMD= 2. 62, 95%CI (1. 76, 3. 91) (P<0. 00001), WMD=1. 35, 95% CI (1. 15, 1. 60) (P=0. 0004) and WMD=1-29, 95% CI (1. 09, 1. 53) (P= 0. 003). There was no significant difference between the two groups in the mean of the uncorrected distance visual acuity ( UCDVA ) , the uncorrected intermediate visual acuity ( UCIVA) , the best corrected distance visual acuity ( BCDVA ) and the best distance corrected near visual acuity ( BDCNVA ) with WMD-0.03, 95% CI (-0.06, 0.01) (P=0.15), WMD= -0.04, 95% CI (-0. 09, 0. 01) (P=0. 10), WMD= -0. 01, 95%CI (-0. 04, 0-02) (P=0. 55) and WMD= 0. 06, 95% CI (-0. 06, 0. 17) (P=0. 32).
CONCLUSION: Patients implanted with ReZOOM MIOL can provide better BDCIVA; patients implanted with ReSTOR MIOL show better UCNVA, are less likely to appear light halo, glare and other visual adverse reactions; correction in spectacles cases, patients implanted with ReZOOM or ReSTOR MIOL have considerable performances in the far and near visual acuity.

AIM:To compare the efficiency of fibrin glue to suture technique in pterygium surgery performed with limbal autograft under different methods of anesthesia.
METHODS: A prospective randomised clinical trial was carried out in 60 eyes of 55 patients operated for primary nasal pterygium, which were divided into two groups randomly: experimental group ( 30 eyes in 27 patients ) was under surface anesthesia ( oxybuprocaine ) and control group ( 30 eyes in 28 patients ) was under local anesthesia ( 20g/L lidocaine ). Autologous limbal graft taken from the superotemporal limbus was used to cover the sclera by a fibrin tissue adhesive after pterygium excision. Patients were followed up at least for 6mo. Time of operation, matching degree of graft and VAS score were mainly observed and recorded.
RESULTS: In experimental group the average surgery time was shorter (P=0. 008) and matching degree of graft ( 93%) was better than control group ( 83%) , the differences had statistical significance(P<0.05).
CONCLUSION: The surface anesthesia is enough when using fibrin glue for graft fixation in pterygium surgery, which will shorten surgery time and get better matching degree of graft.

Objective To evaluate the value of differential diagnosis on congenital biliary atresia(BA) and infantile hepatitis syndrome(IHS) by technetium-99m-diethyl-iminodiacetic acid(99Tcm-EHIDA)hepatobiliary scintigraphy with phenobarbitol sodium.Methods Fifty-eight infants with persistent jaundice were taken phenobarbitol sodium[5 mg/(kg?d)] ,bid ?7 d).Those who had not bowel and gallbladders radioactivity within 24 hours were diagnosed as the diagnostic criterion of BA.Those with bowel and gallbladders radioactivity within 24 hours were diagnosed as the diagnostic criterion of IHS,who then received 99Tcm-EHIDA hepatobiliary scintigraphy with single photon emission computed tomography(SPECT) instrument.The results of all children were analyzed and compared with pathology and clinical follow up results.Results 99Tcm-EHIDA hepatobiliary scintigraphy correctly diagnosed 24 infants with last diagnosis BA and 29 infants with last diagnosis IHS,5 neonates false positive in all 34 IHS patients.The sensitivity in the diagnosis of BA was 100%,the specificity and accuracy were 85.3% and 91.4%,restectively.The sensitivity was 85.3% in the diagnosis of IHS;the specificity and accuracy were 100% and 91.4%,respectively.Conclusions 99Tcm-EHIDA hepatobiliary scintigraphy with phenobarbitol sodium can accurately differentiate BA and HIS at early stage.