It is well documented that altered biosynthesis of cell surface N-linked oligosaccharides is associated with the transformed cells and tumors.N-acetylglucosaminyltransferase Ⅱ(GnT-II;EC 2.4.1.143)is a medial Golgi enzyme that catalyses the incorporation of a GlcNAc residue in ?-1,2 linkage to the Man-?-1,6 arm of the N-glycan core.This is an essential step in the biosynthetic pathway leading from hybrid to complex N-glycans.Because functional GnT-Ⅱ is an prerequisite of N-Acetylglucosaminyltransferase V performance,It was speculated that GnT-Ⅱ was involved in cancer development and progression.The expression of GnT-Ⅱ in mouse breast cancer cells 67NR and 4T1 which have different behavior of metastasis was analysed using RT-PCR.The amounts of GnT-Ⅱ in the highly metastatic cell 4T1 increased to 1.53 times of the lowly metastatic cell 67NR.To determine the association of GnT-Ⅱ with tumor progression,the GnT-Ⅱ encoding gene was amplified with RT-PCR and cloned into retrovirus vector pMSCV,resulting in pMSCV-GnT-Ⅱ.The recombinant plasmid was transfected into 4T1 and the transfected cells were selected in the medium containing puromycin,which were harvested to detect the adhesion ability to fibronection and the migration potential by transwell system.The cell adhesion to fibronectin was weakened by 67% and migration potential was increased by 82%.The data indicates that GnT-Ⅱ mediates cell adhesion and migration,thus may play an important role in cancer metastasis.

Previous studies have revealed Twist,a basic helix-loop-helix transcription factor,plays an important role in breast cancer metastasis.To clarify the molecular mechanism of its involvement in cancer metastasis,Twist was silenced by RNAi in highly metastatic 4T1 cells.Then microarray chips were used to investigate the gene-expression pattern of the Twist-knockdown 4T1 cells and the normal 4T1 cells.The results indicated that silencing of Twist significantly suppressesed lung metastasis of 4T1 cells in vivo.Direct comparison of gene-expression profiles showed that 167 genes in Twist-knockdown cells differed dramatically in expression levels from those in control cells.Among the 167 genes,26 well-known tumor-associated genes,including 15 up-regulated and 11 down-regulated genes were found.These genes appear to be regulated by Twist during breast tumorigenesis.The findings provide new insights into the mechanism by which Twist is involved in tumorigenesis.

BACKGROUND: Properties of cancellous bone is significant for metabolic diseases, fracture and joint retrograde diseases.OBJECTIVE: To study the biomechanical properties of cancellous bone.DESIGN: Experimental observation based on femur specimens as the single sample.SETTING: Laboratory of Orthopaedic Biomechanics Ninth Affiliated Hospital Shanghai Second Medical University.PARTICIPANTS: The study was completed in the Laboratory of Orthopaedic Biomechanics, Shanghai Ninth People's Hospital from May to July in 2001,totally 19 male cadaveric femoral heads were selected.METHODS: Totally 19 cadeveric cancellouce bone specimens(about 30years old) from the bearing area of fresh femur head were tested by compression test.MAIN OUTCOME MEASURES: Yield load limiting stress, limiting strain, energy value and elastic modulus of specimens.RESULTS: The compressive data of cancellous bone were measured, the average value of yield load was (410.64 ± 190.29) N , limiting stress was (8.69 ± 3.75) MPa, limiting strain was (10. 84 ±6.58)%, energy value was (2.54 ± 1.89)J, modulus of elasticity was (40.77 ± 32. 12)MPa, At the early time of loading, the cancellous bone showed elastic deformation, then CONCLUSION: The trial indicates that biomechanical properties lighten the pressure of external compression.

A secretive expression vector of Pichia pastoris system which can be used for the direct cloning of PCR products was constructed,and was verified through the expression of recombinant cellobiohydrolase II in Pichia pastoris.A randomly selected fragment was amplified with properly designed primers by PCR.The XhoI and Eam1105Ⅰ restriction sites were included in the 5'end of the fragment,and the Eam1105Ⅰ and XbaI restriction sites were included in its 3'end.The PCR amplified product was inserted into the P.pastoris expression plasmid pPICZ?A through XhoI and XbaI restriction sites and the resultant plasmid was digested with Eam1105Ⅰ,and lastly the big fragment was recovered,generating the P.pastoris expressive Tvector pPICZ?T.Then the cellobiohydrolase II of T.reesei was successfully expressed in P.pastoris with this expressive Tvector.Such results indicated that the constructed expression Tvector was convenient for PCR product cloning,and was effective for heterologous protein expression in P.pastoris.On the other hand,the application of the expression Tvector avoided the introduction of additional amino acids at the Nterminus of the expressed protein,which generally occurred when normal expression vectors were used in secretive expression system.

Objective To investigate the reason of persisting positive rapid plasma reagin (RPR) in serofast syphilis patients, and to provide reference for clinical treatment and prognosis.Methods A total of 33 serofast patients and 23 healthy controls were enrolled in this study.The percentages and absolute counts of CD3+, CD4+, CD8+ T lymphocytes and natural killer (NK) cells were detected by flow cytometry.The comparison of two groups was analyzed by independent sample t test, and the correlation between change of lymphocyte subgroups and RPR titer in serofast syphilis patients was analyzed by bivariate linear correlation method.Results Compared with healthy controls, the percentages of CD3+, CD8+ T lymphocytes in serofast syphilis group were both increased significantly (75.75±5.76)% vs (68.37±5.80)%, (t=4.69, P<0.01);(27.34±7.02)% vs (24.33±1.95)%, (t=2.34, P=0.025), while both the percentage and absolute count of NK cells were significantly decreased (7.32±4.48)% vs (14.87±6.26)%, (t=5.269, P<0.01);(136.2±83.4)/μL vs (298.8±166.9)/μL, (t=4.311, P<0.01).RPR titer of the patients was negatively correlated with both percentage and absolute count of CD4+ T lymphocytes (r=-0.476 and-0.515, respectively, both P<0.01), and it was positively correlated of CD8+ lymphocytes (r=0.588 and 0.305, P<0.01 and P=0.804).Conclusion The imbalance of immune response of lymphocyte subsets observed in serofast syphilis may explain the RPR titers change.

Chills ; prevention & control ; Cold Temperature ; Female ; Humans ; Occupational Exposure ; prevention & control ; Occupational Health Services ; Water

Akt1 is a serine-threonine protein kinase that has been implicated in the control of cellular metabolism,survival and growth.Elevated expression of Akt1 has been noted in a significant percentage of human tumors,promoting cellular metastasis.Conversely,some studies have revealed hyperactivated Akt1 inhibited the invasiveness and metastasis of breast cancer cells.To clarify the definite effect of Akt1 on tumorigenesis and development,Akt1 was silenced by RNAi in the highly metastatic murine breast cancer 4T1 cells.Akt1 silencing didn't affect the proliferation of breast cancer cells in MTT assay,while reduced the migration in Transwell assay.Consistent with the above results,Akt1 silencing didn't change the primary tumor weight,but significantly suppressed lung metastasis of 4T1 cells.These observations indicated Akt1 plays an important role in murine breast cancer metastasis,and suggested that Akt1 might be a therapeutic target for breast cancer metastasis.

OBJECTIVETo investigate the protective effect of Danxuetong injection (DXT, a combination of Danshen and Xueshuantong injections) against testicular ischemia-reperfusion injury following testis torsion/detorsion in rats.

METHODSThirty-two 4-week-old healthy male SD rats were randomly divided into four groups of equal number: sham operation, normal saline, single DXT injection, and successive DXT injection. The rat models of testicular ischemia-reperfusion injury were established by 2-hour 720-degree torsion/detorsion of the unilateral testis. At 6 weeks after modeling, the rats were killed and their testes were harvested for measure- ment of testicular coefficients, sperm counts, sperm motility, and the levels of total anti-oxidative capacity (T-AOC) , superoxide dismutase (SOD) , nitric oxide synthase (NOS) , and malondialdehyde ( MDA) in the testis tissue.

RESULTSCompared with the rats of the normal saline group, those of the single DXT injection and successive DXT injection groups showed significant increases in the testicular coefficient (0.11 ± 0.03 vs 0.35 ± 0.04 and 0.40 ± 0.06, P < 0.05), sperm count ([0.46 ± 0.10] vs [1.44 ± 0.50] and [3.00 ± 1.28] x10(9)/ml, P < 0.05), sperm motility ([13.63 ± 14.04] vs [39.63 ± 5.04] and [76.31 ± 3.67]%, P < 0.05), the activity of SOD (72.76 ± 5.58 vs 116.25 ± 8.83 and 133.20 ± 13.84, P < 0.05), and the level of T-AOC (5.58 ± 1.07 vs 13.34 ± 5.81 and 19.21 ± 5.69, P < 0.05), but a remarkable decrease in the content of MDA (42.38 ± 8.94 vs 20.94 ± 5.65 and 15.02 ± 1.03, P < 0. 05) in the injured testes.

CONCLUSIONDXT can effectively rid the testis tissue of oxygen free radicals, improve sperm count and motility by antioxidation, and protect the testis tissue of prepubertal rats against testicular ischemia-reperfusion injury after testis torsion/detorsion. It also has a protective effect on the contralateral testis, and successive injection has a better effect than single injection of DXT.

Animals ; Antioxidants ; therapeutic use ; Drug Therapy, Combination ; methods ; Drugs, Chinese Herbal ; therapeutic use ; Humans ; Male ; Malondialdehyde ; metabolism ; Nitric Oxide Synthase ; metabolism ; Random Allocation ; Rats ; Rats, Sprague-Dawley ; Reperfusion Injury ; prevention & control ; Spermatic Cord Torsion ; complications ; therapy ; Superoxide Dismutase ; metabolism ; Testis ; blood supply ; metabolism

Objective To evaluate the quality coherence of commercial Angelicae Dahuricae Radix (Baizhi) decoction pieces. Methods The samples of 12 batches of commercial decoction pieces, 1 batch of sulphur fumigated Baizhi, and 1 batch of naturally dried Baizhi were collected. HPLC method was used to determine the fingerprints and the contents of imperatorin and isoimperatorin by C18 column (4.6 mm×250 mm, 5 μm) with a gradient mobile phase of acetonitrile-water solution system at the flow rate of 1.0 mL/min. The column temperature was set at 35 ℃, and the max plot of detection wavelength was in 210-800 nm. Similarity calculation was used to analyze the data. Results The HPLC fingerprint analysis method was established with 12 common peaks. The similarities of 12 batches of commercial decoction pieces of Baizhi were 0.840-0.973. Their similarities compared with the sulphur fumigated Baizhi were 0.672-0.908. Compared with naturally dried Baizhi, the similarities of fingerprint were 0.536-0.684. The contents of imperatorin and isoimperatorin in 12 batches of commercial decoction pieces were 0.035%-0.140% and 0.028%-0.069%, respectively. Conclusion The quality of Baizhi decoction pieces was consistent. It can be speculated that Baizhi decoction pieces were processed with sulphur fumigation.

This study aimed to develop the calculation method of pre-hospital emergency physician allocation gap and apply it to Shanghai.In order to reduce the ambulance dispatch lag frequency, through the analysis of its da-ta in the Shanghai urban area, the research group obtained the gap and extended the data to Shanghai city.The peak method establishes the association between pre-hospital emergency physician increment and the ambulance dispatch lag decrement.Based on descriptive statistics, the peak method by which the Shanghai ambulance dispatch lag data were analyzed uses the SAS programming software.This method of using programming software provides it with good reliability and validity.After an increase of 40 duty vehicles (381 pre-hospital emergency physicians), the ambu-lance dispatch lag ratio would drop from 25.61 percent to 0.22.Therefore, the association between the pre-hospital emergency physician increment and the ambulance dispatch lag decrement was established and can provide a scientif-ic evidence for the policy formulation.