Objective To study the main subtypes messenger ribonucleic acid(mRNA) and the basal enzyme activity of phosphodiesterase (PDE) in rat pulmonary microvascular endothelial cells (PMVECs) through the examination mRNA expression and activity of PDE in vitro. The data were offered to reveal the relationship between PDE distributions, activity change and to accumulate data for the possibility of drug regulation of its functional alteration. Methods The cells were cultured with tissue-sticking method;the gene expression of PDEs was detected by reverse transcript polymerase chain reaction (RT-PCR), and the activity of PDEs was calculated by cyclic nucleotides content change examined with high performance liquid chromatogram (HPLC) before and after the PDE reaction( n ＝3). Results The PMVECs identified by cell immunofluorescence with polyclonal antibody of CD31 were dissociated and cultured, mRNAs of PDE1A, 1C, 2A,3A, 3B, 4A, 4D, 5A, 7A, 7B, 8A, 8B, 9A, 10A,11A were expressed in PMVECs, but there was no mRNA of PDE1B expressed in PMVECs. cAMP/cGMP-PDE in the extent of 5-20μl had a good linear correlation with its activity. Conclusion There are 17 kinds of PDE gene expression existing in PMVECs which contain of the basic enzyme with a higher activity.

Objective To establish homogeneous immunoassay for detecting serum cardiac troponin I (cTnI) by using light induced chemiluminescent immunoassay (LiCA). Methods Polyclonal antibodies of cTnI were coated on the receptor particles, monoclonal antibodies of cTnI were biotinylated, and the donor particles were coated with streptavidin, all of which were composed of LiCA reagents. The optimal test conditions and analytical performance of the detection method were studied. Results The method was rapid, sensitive, and detection time was 17.5 min.The analytical sensitivity was 0.045 ng/mL and the functional sensitivity was 0.053 ng/mL.The recovery rate was 104.96%-108.21%;The within-run and the between-run coefficients of variation were 3.88%-5.53%and 7.60%-8.75%, respectively. The interference rates for the endogenous substances were less than 10%. The reference value of cTnI was less than 1.05 ng/mL;Results of cTnI LiCA correlated well with direct chemiluminescence detection (r2 =0.979). Conclusions This approach can be used for the quantitative detection of serum cTnI, and it is homogeneous and is free of clean separation. It provides a convenient, highly sensitive detection platform for clinical practice.

Objectives To investigate the rational treatment strategy of hepatoblastoma (HB) in children. Methods Clinical data and follow-up of 25 children with HB admitted from February 2009 to March 2013 were retrospectively analyzed. Results Twenty-five children with newly diagnosed HB (14 males and 11 females) were enrolled. The median age on diagnosis was 25 months (3-92 months);In 18 of 25 cases with complete resection of the primary tumor, 17 cases survived. Only 1 of 7 cases with incomplete resection survived. The survival rate in children with complete resection of primary tumor is significantly higher than those without complete resection (P<0.05). The survival rate in children of stage I or II is significantly higher than the children of stage III or IV (P<0.05). Conclusions Complete tumor resection is the cornerstone of therapy for long-term disease-free survival in HB patients. Treatment strategy remains to be further improved for children with recurrent and metastatic HB.

Objective:To investigate the biological mechanism of the degeneration of cervical spine in cervical spondylosis(CS) by analyzing the alteration of bone matrix components.Methods:Twenty five degenerative cervical vertebra and 8 blood samples from CS cases were collected.The contents of hyaluronic acid(HA),laminin(LN),pro collagen Ⅲ,collagen Ⅳ were detected by radioimmunoassay.Calcium,phosphate and total protein levels were detected by automatic biochemical analyzer.Results:Ruling out the inference of blood, the contents of HA, LN, pro collagen Ⅲ and collagen Ⅳ were significantly lower in degenerated CS vertebra than in the control, so as the levels of calcium and phosphate. Conclusion:Bone matrix components are obviously decreased during the degeneration of cervical vertebra, resulting in the alleviation of bone tenacity and hardness. This may be one of the biological mechanisms of cervical vertebra degeneration and deterioration of cervical spine biomechanics.

Objective To study the relationship between plasma creatinine and lactic acid levels in type 2 diabetic patients with normal renal function, and the effect of mefformiu administration on plasma lactic acid. Methods Blood samples were collected from 723 type 2 diabetic inpatients(275 cases treated with mefformin as treatment group and 448 without mefformin as control group). Plasma lactic acid was measured with enzyme-electrode assay. The fasting plasma glucose, fasting insulin, creatinine (Cr) , alanine aminotransferase (ALT), and HbA1C levels were also determined. Results (1) The lactic acid level in treatment group was significantly higher than that in control group [(1.33±0.57 vs 1.17±0.47) mmol/L, P<0.01] and so was the incidence of hyperlactacidemia (9.45% vs 4.91%, P<0.01). No lactic acidosis was found in all patients. (2) The correlation analysis showed that Cr, blood urea nitrogen, ALT and body mass index (BMI) were positively correlated with lactic acid in control group, and the positive correlation between Cr and lactic acid still existed (r= 0.345, P<0.01) after adjustment for ALT and BMI. (3) After being divided by 20 μmol/L Cr in control group, lactic acid levels in subgroup increased with the Cr levels, especially when Cr was over 90 μmol/L. The Cr cutpoint for predicting lactatemia was 95.35 μmol/L. Conclusion It is safe to administrate metformin in type 2 diabetic patients with normal renal function, along with low risk of lactic acidemia. The incidence of lactic acidemia may increase when plasma Cr level reaches 95.35 μmol/L,

BACKGROUNDThe goal of total knee arthroplasty (TKA) is to restore knee kinematics. Knee prosthesis design plays a very important role in successful restoration. Here, kinematics models of normal and prosthetic knees were created and validated using previously published data.

METHODSComputed tomography and magnetic resonance imaging scans of a healthy, anticorrosive female cadaver were used to establish a model of the entire lower limbs, including the femur, tibia, patella, fibula, distal femur cartilage, and medial and lateral menisci, as well as the anterior cruciate, posterior cruciate, medial collateral, and lateral collateral ligaments. The data from the three-dimensional models of the normal knee joint and a posterior-stabilized (PS) knee prosthesis were imported into finite element analysis software to create the final kinematic model of the TKA prosthesis, which was then validated by comparison with a previous study. The displacement of the medial/lateral femur and the internal rotation angle of the tibia were analyzed during 0-135° flexion.

RESULTSBoth the output data trends and the measured values derived from the normal knee's kinematics model were very close to the results reported in a previous in vivo study, suggesting that this model can be used for further analyses. The PS knee prosthesis underwent an abnormal forward displacement compared with the normal knee and has insufficient, or insufficiently aggressive, "rollback" compared with the lateral femur of the normal knee. In addition, a certain degree of reverse rotation occurs during flexion of the PS knee prosthesis.

CONCLUSIONSThere were still several differences between the kinematics of the PS knee prosthesis and a normal knee, suggesting room for improving the design of the PS knee prosthesis. The abnormal kinematics during early flexion shows that the design of the articular surface played a vital role in improving the kinematics of the PS knee prosthesis.

Adult ; Arthroplasty, Replacement, Knee ; methods ; Biomechanical Phenomena ; Female ; Humans ; Knee Prosthesis

0.05),while hyperlactacidemia existed in 21 patients(4.62%).LA levels increased with the creatinine levels,especially in those with Cr more than 90 ?mol/L.However,LA levels increased with the reduction of GFR,especially in those with GFR less than 80 mL/min.It was revealed by correlation analysis that LA level was positively correlated with Cr,ALT and BMI.The optimal cutoff of Cr inducing the lactic acidemia was 95.35 ?mol/L.Conclusion The baseline LA levels of patients with T2DM are similar to those of healthy adults,and LA levels are mainly influenced by BMI and renal and hepatic function.Hyperlactacidemia may be induced when Cr reaches a level more than 95 ?mol/L.

Objective To study the correlation between fractional anisotropy(FA)and tumor microarchitecture(MVD,VEGF and celluarity).Methods Fouteen gliomas(5 grade Ⅰ and Ⅱ,4 grade Ⅲ, 5 grade Ⅳ)confirmed histo-pathologically were performed on diffusion tensor imaging(DTI)using a GE Signa Excite Ⅱ 3.0 T MR scanner(8-channel head coil,SE echo planner imaging(EPI),thickness:5 mm, spacing:0,directions:25,B values:0 and 1000 s/mm~2,TR 6000 ms,TE minimum,FOV:240 mm? 240 mm,image matrix 128?128,NEX 2).Postprocessing was done using a DTI specific software to gain FA image.ROIs were drqwn in tumor parenchyma and the value of FA was recorded.The positive expression of VEGF and CD34 was shown using immuno-histochemistry method.The VEGF,MVD,and cellularity of every slices were recorded.Pearson correlation analysis was used.Results FA(which is 0.102?0.080 in grade Ⅰ and Ⅱ,0.171?0.037 in grade Ⅲ,0.200?0.021 in grade Ⅳ)has the trend to raise with the increasing grade of astrocytomas.FA has significant positive correlation to MVD(40/HP in grade Ⅰ and Ⅱ, 86/HP in grade Ⅲ,101/HP in grade Ⅳ),VEGF(8% in grade Ⅰ and Ⅱ,47% in grade Ⅲ,55% in grade Ⅳ),and cellularity(104/HP in grade Ⅰ and Ⅱ,160/HP in grade Ⅲ,265/HP in grade Ⅳ).The correlation coefficients between FA and VEGF,MVD,and cellularity were 0.748,0.668,0.625 respectively.Conclusion As a new imaging method,DTI can reveal the microarchitecture in gliomas and be value of distinguishing gliomas of different grade.DTI provides a new method of precise diagnosis to glioma preoperatively.

OBJECTIVETo evaluate the association between p53 codon 72 polymorphism (R72P) and the risk of colorectal liver metastases.

METHODSThe p53 R72P genotype was identified by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method in 78 consecutive colorectal cancer patients with liver metastases and 214 age- and sex-matched cases with nonmetastatic colorectal cancer.

RESULTSThe R allele of the p53 R72P polymorphism was more frequently found in metastatic cases than in nonmetastatic cases (P=0.075). Carriers of the 72R allele had a 2.25-fold (95% CI (confidence interval)=1.05 to approximately 4.83) increased risk of liver metastases. On the stratification analysis, 72R-carrying genotype conferred a 3.46-fold (95% CI=1.02 to approximately 11.72) and a 1.05-fold (95% CI=0.36 to approximately 3.08) increased risk of liver metastases for p53 overexpression-positive and negative colorectal cancers, respectively.

CONCLUSIONThese results demonstrate for the first time that the 72R allele of the p53 polymorphism has an increased risk for liver metastases in colorectal cancers positive for p53 overexpression.

Adenocarcinoma ; genetics ; metabolism ; pathology ; secondary ; Case-Control Studies ; Colorectal Neoplasms ; genetics ; metabolism ; pathology ; DNA, Neoplasm ; blood ; genetics ; Female ; Genes, p53 ; Genetic Predisposition to Disease ; Genotype ; Humans ; Liver Neoplasms ; genetics ; metabolism ; secondary ; Logistic Models ; Male ; Middle Aged ; Multivariate Analysis ; Polymerase Chain Reaction ; Polymorphism, Restriction Fragment Length ; Polymorphism, Single Nucleotide ; Tumor Suppressor Protein p53 ; biosynthesis ; genetics

OBJECTIVESTo review the preliminary clinical experience with high-field-strength intraoperative magnetic resonance imaging (iMRI) suite with neuronavigation system in the pituitary adenoma operation with transsphenoidal approach.

METHODSFrom March 2009 to December 2010, 31 patients [range, 29 - 76 years, mean age (47 ± 11) years]of pituitary adenoma were operated with transsphenoidal approach and intraoperatively with a movable 1.5 T high-field-strength iMRI suite in combination with neuronavigation system. Tumor size was 1.8 - 7.3 cm, mean (3.5 ± 1.2) cm. Twenty-five cases were non-functional pituitary adenoma, 4 cases were prolactin-secreting pituitary adenoma, 2 cases were growth hormone-secreting pituitary adenoma. Thirty patients' resection with transnasal transsphenoidal approach were performed, one patient with transoral transsphenoidal approach was performed.

RESULTSIn 12 cases of 30 patients who planed to totally remove tumor, iMRI had revealed residual lesions and resulted in the change of the surgical strategy, 2 invasive cavernous sinus cases no further resection of the tumor because of internal carotid artery encasement, the other 10 cases resected further, eventually. Finally, 8 cases were totally removed. The ratio of total removal tumor was enhanced to 86.7% (26/30) from 60.0% (18/30). There was no perioperative mortality.

CONCLUSIONSHigh-field-strength iMRI suite with neuronavigation system provides valuable information of tumor resection that allows intraoperative modification of the surgical strategy. It could be very helpful to maximize the resection of the pituitary adenoma and minimize the injury to neurological function.

Adenoma ; surgery ; Adult ; Aged ; Cavernous Sinus ; surgery ; Female ; Humans ; Magnetic Resonance Imaging ; methods ; Male ; Middle Aged ; Monitoring, Intraoperative ; methods ; Neuronavigation ; methods ; Pituitary Neoplasms ; surgery