BACKGROUND:For the sacroiliac joint has complex structure and locates deep,its biomechanical properties have not been fully understood,even less about the study of reconstruction.OBJECTIVE:To construct a finite element model of pelvis after subtotal sacrectomy,and validate its effectiveness,which is supposed to be useful for evaluating reconstructions of sacroiliac joint.TIME AND SETTING:The establishment and validation of three-dimensional finite element model was performed in the Orthopaedic Laboratory of Changhai Hospital,Second Military Medical University between January and March 2008.MATERIALS:The CT scan images of adult males who had no pathological changes in lumber and pelvis were downloaded from CT work station in Changhai hospital.The CT scan included low lumber and whole pelvis,and got 132 DICOM images in all.METHODS:Two three-dimensional finite element pelvis models were established:① an intact pelvis model,② a defective pelvis model on which subtotal sacrectomy was performed cephalic to the S1 neural foramina.According to the biomechanical experiment of Hugate RR Jr,axial loads of 3 000 N and 1 000 N were applied on intact and defective pelvis models,respectively.The max axial displacements and stiffness on the L5 of two models were calculated and following comparison with the result in the literature.MAIN OUTCOME MEASURES:The max axial displacements and stiffness on the L5 were observed and considered as the index reflecting sacroiliac joint stability.RESULTS:The max axial displacements of the L5 on intact and defective pelvis models were 7.99 mm and 7.68 mm,respectively.The stiffness of the L5 on intact and defective pelvis models were 375 N/mm and 130 N/mm,respectively.The max axial displacements of the L5 on intact and defective pelvis models in the literature were(10.73?5.10) mm and(11.71?5.74) mm,and the stiffness were(353?231) N/mm and(101?49) N/mm,respectivly .CONCLUSION:In this experiment,we were successful to establish the finite element model of pelvis after subtotal sacrectomy.The calculated result was similar with the reference.The model could be used to evaluate different ways to reconstruct the sacroiliac joint.

Objective To evaluate the safety and accuracy of CT-guided cutting needle biopsy for the hepatic lesions near diaphragmatic dome.Methods A total of 25 cases with hepatic lesions near the diaphragmatic dome were undertaken CT-guided cutting needle biopsy using 16 gauge or 18 gauge core biopsy needles.Results Histological examination showed malignancy in 17 cases and benign in 8 with 2 false negative results(8%),and there were no false positive results.The specificities of malignant and benign lesions were 100% and 75%,respectively.Overall accuracy was 92%.Pneumothorax,needle tract hemorrhage,and subcapsular hepatic hemorrhage occurred in 2(8%),1(4%)and 1(4%),respectively.Conclusion CT-guided cutting needle biopsy for the hepatic lesions near diaphragmatic dome is a reliable and relatively safe diagnostic method.(J Intervent Radiol,2007,16:838-840)

Objective To evaluate the functional outcome,predicting response and toxicity of CT- guided permanent implanted ~(125)I seed branchytherapy for metastatic cancers in vertebrae.Methods Forty three vertebrae with metastatic cancer were treated by CT-guided percutaneous permanent implanted ~(125)I seed branchytherapy in 15 patients.There were 8 male and 7 female patients with average age of 54.6 years and 2 to 5 vertebrae involved in this group.According to the size of tumor,the optimal activity and quantity of seeds were calculated by TPS and correlative formula.~(125)I seeds were implanted percutaneous puncture under CT- guidance with coaxial needles to pass the normal osseous tissue for approaching the lesions including 3 routes of pedicnlar lateral and anterior ways.The distance between seeds and posterior border of vertebral body was over 3 nun(3-10mm).Permanent ~(125)I seed implantation brachytherapy for paraspinal metastatic lesions were also taken place.Results Mean follow-up time was 12.3 months(range 3-30 months)and outcome was evaluated clinically and radiographieally in 10 of 15 procedures,with 5 only on clinical data.No new pain occurred at 11 sites with no previous complaint.The pain was completely controlled at 18/32 sites,partial control at 14/32 sites.No complications correlated to the radiotherapy damage of nerve and spinal cord were found.Conclusion The procedure of CT-guided permanent implanted ~(125)I seeds brachytherapy for vertebral metastatic cancers is a safe effective and minimal invasive method with few complications.It is beneficial not only for pretherapeutic metastasis but also for recurrent tumors after radiotherapy;bearing rather high tolerance and safety.(J Intervent Radiol,2007,16:834-837)

Objective To investigate the proliferation and identification of dendritic cells(DC)de- rived from peripheral blood of patients with bladder cancer in vitro.Methods The mononuclear cells were prepared from peripheral blood of patients with bladder cancer by Ficoll-Hypaque centrifugation method,and were induced by the recombinant cytokines hGM-CSF(50 ng/ml),hlL-4(10 ng/ml)and hTNF-?(50 ng/ ml)for 2 weeks.The growth and morphology of DC were observed through the phase contrast or electron mi- croscope,and their pheuotypes were determined by flow cytometry.The capacity of DC to activate T cell-de- pendent anti-tumor immune responses was tested by MTT method.Results The DC cultured in vitro turned into suspensive growth from adhesive situation on the 6th day,then the number of DC increased con- tinuously and the cells showed the irregular morphologic appearance of DC with veiled edges on the 8th day. Flow cytometry showed that the mature DC expressed high levels of specific markers such as CD_(1a),CD_(83), CD_(86)and HLA-DR.T cells activated by DC showed strong cytotoxicity to bladder cancer cell line BIU87 with a killing rate of(48.8?3.7)%,while the killing rate of T cells which were not activated by DC was(25.7?1.5)%;the difference of the rate between them was significant(P＜0.01). Conclusions The DC can be cultured from peripheral blood of patients with bladder cancer by induction of rhGM-CSF,rhIL-4 and hT- NF-?in vitro.This may lay an experimental foundation for further research on DC vaccine.

Objective To establish an accurate TaqMan probe real-time quantitative PCR (qPCR)method for detection of Theiler''s-like virus of rats (TLV).Methods Primers and TaqMan probes specific to 3622~3729 nt region were designed according to the whole genomic sequence of TLV representative strain.Using a synthesized plasmid as DNA standard template, the stability, specificity, and sensitivity of the qPCR method were determined.Results In the standard curve, R2 value was 0.99 with a high specificity.The sensitivity of the real-time PCR was less than 10 copies/μL, which was 100 times higher than the ordinary PCR method.No cross reactions appeared to the other rat viruses.Conclusions The TaqMan probe qPCR method established in this study has advantages such as simple to use, high sensitivity and specificity.

Acclimatization ; physiology ; Adult ; Altitude ; Fatty Acid-Binding Proteins ; metabolism ; Humans ; Male ; Middle Aged ; Myelin Basic Protein ; metabolism ; Nervous System Diseases ; metabolism ; Occupational Exposure ; Succinate Dehydrogenase ; metabolism

OBJECTIVETo detect the in-vitro effects of arbidol hydrochloride against 2009 new influenza virus A (H1N1).

METHODSThe activity of arbidol hydrochloride against 2009 new influenza virus A (H1N1) was determined in MDCK cell cultures. Hemagglutination assay, observation of cytopathic effects, RT-PCR and quantitative RT-PCR tests were performed for determination of virus titers. Inhibition concentration 50% and cytotoxic concentration 50% were calculated with Chou's Menu of Dose-Effect Program.

RESULTSArbidol hydrochloride showed low cytotoxicity (cytotoxic concentration 50%>100 μmol/L)and significant anti-2009 new influenza virus A (H1N1) activity in cell cultures. Inhibition concentration 50% were (5.5 ± 0.9), (3.4 ± 0.8), and (1.5 ± 0.2) μmol/L in hemagglutination assay, cytopathic effect test, and quantitative RT-PCR assay, respectively.

CONCLUSIONArbidol has low cytotoxicity and high anti-virus activity and can effectively trigger the activities of interferon and immune response, and therefore can be a valuable anti-influenza virus drug.

Animals ; Antiviral Agents ; pharmacology ; Dogs ; Indoles ; pharmacology ; Influenza A Virus, H1N1 Subtype ; drug effects ; Madin Darby Canine Kidney Cells ; Virus Replication ; drug effects

ObjectiveTo investigate the methylation of the promoter region in miRNA in pancreatic cancer cell line PANC1 and normal pancreatic tissue,to discover the miRNA with hypermethylation associated with pancreatic cancer.MethodsThe genomic DNA of PANC1 and normal pancreatic tissue was extracted,and fractured by ultrasound.Methylation DNA fragments were obtained by 5-methyl of pyrimidine nucleoside antibodies and immunomagnetic beads.The hypermethylation miRNA differentially expressed between PANC1 and normal pancreatic tissue was selected by using methylation DNA chip.BSP ( bisulfite genomic sequencing PCR) and TA clone sequencing was performed for further validation.The genomic DNA of pancreatic cancer cell lines BXPC3,CFPAC1,PANC1 and SW1990 was extracted.The COBRA (combined bisulfite restriction analysis) was used to validate differentially expressed hypermethylation miRNA.ResultsEight differentially expressed hypermethylation miRNAs were screened from the DNA methylation chips,then five of them were selected for sequencing.The methylation status of miRNA-615,-663,-663b was significantly higher in the PANC1 than in normal tissues (60.6％ vs 7.6％,88.8％ vs 22.2％,94.4％ vs 13.0％ ) ; the methylation status of miRNA-675 was not significantly different between PANC1 and normal pancreatic tissue (76.0％ vs 100％ ).Due to large error in sequencing,miRNA1826 was excluded.The results of COBRA confirmed all the 4 miRNAs were highly methylated in PANC1 ; except for miRNA-675,other 3 miRNAs were highly methylated in BxPC,miRNA-663,miRNA-663b were highly methylated in CFPAC1,while miRNA-615,miRNA-663 were highly methylated in SW1990.ConclusionsHypermethylation miRNAs were differentially expressed between pancreatic cancer cell lines and normal pancreatic tissue,among them,highly methylated miRNA-663 was possibly associated with pancreatic cancer.

A new method for the determination of organic acids from mainstream cigarette smoke using ultra low temperature solvent extraction-comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry(GC×GC-TOF/MS)was established. The mainstream smoke was directly trapped by ethyl ether with ultra low temperature solvent extraction device, and cleaned up with liquid-liquid extraction. The concentrated extracts were further derived by N,O-bis(trimethylsily)trifluoroacetamide (BSTFA). The good separation of silanized product was achieved by the column set of DB-1 (30 m × 0. 25 mm, 1. 0 μm) as the 1st column and DB-wax (1. 5 m × 0. 1 mm, 0. 1 μm) as the 2nd column with modulation period of 6 s and scan range of m/z 45-450 . The results showed that linearity correlation coefficients were larger than 0 . 99 , and the average recoveries were between 80. 17% and 107. 81% with the relative standard deviations (RSD) in the range of 0 . 4%-12 . 1% ( n=5 ) . The detection limit and the quantitation limit were 1 . 3-24 . 5 μg/kg and 4. 1-77. 1 μg/kg, respectively.