Objective To investigate the mechanisms of phenytoin accelerating healing process.Methods Adult male Wistar rats that survived ligatation of the left coronary artery were randomized to phenytoin group or operation control and compared to sham-operated rats.The time-dependent proteolytic activity of MMP-2 and MMP-9 were detected by gelatin zymography.Picrosirius red staining plus polarized light micrscopy was used for qualitative and quantitative analysis of collagen include collagen volume fraction(CVF) and ratio of typeⅠ/Ⅲ collagen.In addition,infarct thickness and myocyte cross-sectional area were also evaluated by image analysis.Results Fourteen days after myocardial infartion(MI),phenytoin reduced infarct wall thinning.Compared with control group,the rats received phenytoin had less myocyte cross-sectional area.Two weeks after MI,CVF in two groups both had significantly dynamic increase and phenytoin accelerated the change.In contrast to control group,ratio of typeⅠto type Ⅲ collagen in phenytoin increased more quickly.Apart from these results,phenytoin did little to CVF in non-infarcted region.Analysis of MMPs activity in myocardial extracts by zymography demonstrated that infarction-induced expression of proMMPs and active MMPs was both upregulated in phenytoin group and operation control.We found that after MI,MMP-9 activity increased as early as 1 day and reached a maximum then gradually descended,whereas MMP-2 began to increase rapidly and remain elevated for up to 14 days thereafter.Phenytoin seemed toenhance expression of MMP-2 and MMP-9.1 day after MI,active MMP-9 in phenytoin group expressed an increasing trendency compared to MI control.Conclusion Phenytoin can attenuate the degree of post-infarction left ventricular dilation and expansion of the infarct during the early phase of MI healing.MMP-2 and MMP-9 enhanced by phenytoin probably played a prominent role.

Objective To observe the influence of diabetes mellitus or insulin on fluctuations of serum potassium in patients with maintenance hemodialysis.Methods 52 cases of hemodialysis patients,including 30 non-diabetes patients,11 patients with diabetes but not using insulin,11 diabetes patients using insulin.At the time of 0,24,48 h during dialysis,we collected serum samples from the 52 patients,serum potassium was compared among the three groups.Results On 0,24,48 h,serum potassium level of the diabetes but not using insulin group had no significant difference with the non-diabetes group.While in diabetes using insulin group,serum potassium level was lower compared with the non-diabetes group or diabetes not using insulin group.Conclusions Diabetes itself had no effect on serum potassium fluctuations of maintenance hemodialysis (MHD) patients,however,insulin can reduce the pre-dialysis serum potassium levels of MHD patients.

Objective To discuss the blood flow charateristics of normal Couinaud’s hepatic segments by using whole-liver perfu-sion with multi-slice spiral computed tomography (MSCT).Methods 73 patients underwent whole-liver perfusion enhanced CT scans for detection of gastric or pancreas cancer,and some were excluded including metastatic liver tumors in 7,multiple liver cysts (>3 cm in diameter)in 6,cirrhosis in 6,liver operation or splenecormy in 3,intra-hepatic bile duct dilation in 1,and excessive motion artifacts in 4.The final 46 patients with normal liver were included,and the perfusion parameters of liver segments were measured for estimating blood-dynamics condition.Results The hepatic arterial perfusion (HAP)in segment 3 was significantly higher than that in segment 6,7 and 8 (P <0.05),and the HAP in segment 4 was significantly higher than that in segment 7 (P <0.05).The hepatic perfusion index (HPI)in segment 3 was significantly higher than that in segment 7 (P <0.05).All normal liver were classi-fied into two groups (group A:<60 years,group B:≥60 years),and no significant correlation between age groups was found.How-ever,the perfusion parameter values in group A were higher than those in group B.No significant correlation was found between gen-ders.Conclusion Our results suggest that differences exist in normal hepatic parenchyma between liver segments.MSCT whole-liver perfusion imaging can more comprehensively response hemodynamic changes in liver,and provids the imaging basis for clinical evaluation of liver disease.

ObjectiveTo analyze the differences of United States (US) and France (Fr) Risser grading systems in determining the growth potentiality of girls with adolescent idiopathic scoliosis (AIS).Methods Girls with AIS undergoing posterior spinal correction with autogenous bone graft were recruited.The Risser grades were recorded for the non-dominant side iliac crest apophysis according to the US and Fr grading systems.Iliac crest cartilage biopsies were harvested during surgery then standard histologic grades(HGs) of proliferation activity of iliac cartilage were analyzed on histological section.The agreement of two grading systems was analyzed by kappa statistics while the correlation between Risser grades and HGs were analyzed by Spearman correlation analysis.Receiver Operating Characteristic (ROC) curve was employed for selecting the best parameter in determining growth cessation of girls with AIS.ResultsFifty-three AIS girls with an average age of 14.0 years were recruited.The agreement of two grading systems was poor.The US system showed higher correlation with HGs compared to Fr system.Growth cessation could be determined by Risser grade 5 of US system or Risser grade 4 of Fr system,also older than 16 years or three years after menarche.When combining the results of ROC curve analysis,the Risser grade 4-5 of US system with two years after menarche could be used in determining growth cessation with the highest sensitivity,specificity and accuracy.Furthermore,the mean age of patients with growth cessation determined by this method was 15.2 years,showed 0.9-1.4 years earlier than the age determined by other methods.ConclusionThe US Risser grading system is better in determining maturity of AIS girls compared to Fr Risser grading system.By combining years since menarche,the accuracy of Risser grades in determining growth cessation could be enhanced,and the time of weaning from a brace could be advanced.

Objective To observe whether sodium arsenite(NaAsO2)can activate the expressions of hemeoxygenase-1(HO-1)of normal human liver cell line named Chang liver.Methods Chang liver cells were exposed to NaAsO2 at 10 μmoL/L,0(contml),2,6,12,24 h and at 0(control),5,10,25,50 μmol/L in 12 h, followed by the measuring of the expressions of HO-1 protein in ceUs with western blot.Results In 10 μmol/L groups Chang liver cells exposed for 6,12,24 h cultured in vitro,the expressions of HO-l protein(3.97±0.72, 12.92±2.98,23.29±3.82)was significantly higher than that of control(1.00±0.00),and compared with the control, the difference being statistically significant(F=85.83,P＜0.01;t=-9.42,-8.95,-13.83,respectively,P＜ 0.05 or＜0.01).In 12 h,5,10,25 and 50 μmol/L groups cultured in vitro,the expressions of HO-1(16.34±0.25, 7.75±0.39,7.93±0.14,12.48±0.35)was significantly higher than that of control(1.00±0.00).and compared with the control,the difference being statistically significant(F=85.83,P＜0.01;t=-36.25,-30.19,-86.40, -56.40,respectively,all P＜0.01).Conclusion Inorganic arsenic call induce the activation of HO-1,promote the expression of protein in a time-and dose-dependent manner.

Polymyxin E shows effective treatment of the infection induced by resistant gramnegative bacteria, but its nephrotoxicity severely limits the clinical application of this drug. In this work, methoxypolyethylene glycols 2000 (mPEG2K)-polymyxin E (PME) was synthesized via chemical grafting reaction and had been characterized. The antimicrobial activity and cytotoxicity of mPEG2K-PME in vitro were investigated on Escherichia coli and HK-2 cells, separately. Intra-abdominal infection model was further established in order to study the therapeutic effect and the toxic effect on kidney of mice. The results showed that mPEG2K-PME exhibited significant inhibitory effect on Escherichia coli and had a lower toxicity on HK-2 cells in vitro. At the same time, mPEG2K-PME had a good efficacy in the treatment of Escherichia coli infected mice in vivo. Moreover, nephrotoxicity caused by mPEG2K-PME was significantly reduced compared to free PME. mPEG2K-PME is promising in development of new preparations with high efficiency and low toxicity.
Animals ; Cell Line ; Colistin ; pharmacology ; toxicity ; Escherichia coli ; drug effects ; Escherichia coli Infections ; drug therapy ; Humans ; Kidney ; cytology ; drug effects ; Mice ; Polyethylene Glycols ; chemistry

Four compounds were isolated from the 70% EtOH extract of Ardisia crispa by using various chromatographic techniques, including silica gel, ODS and semi-preparative HPLC. The structures of 1-4 were elucidated based on physicochemical properties and spectroscopic data. These compounds were defined as crispalactone A (1), (+)-pinoresinol (2), 3,5-dimethoxy-4- hydroxyphenol-1-O-β-D-glucopyranoside (3) and (+)-schizandriside (4). Compound 1 is a new γ-valerolactone derivative, and compounds 2-4 are firstly isolated from Ardisia crispa.

Objective To study the expressions of costimulatory molecule B7-H3 and Ki-67 in human glioma and explore their correlation. Methods Forty-six human brain gliomas, collected in our hospital from March 2008 to January 2010, including 21 with low grade and 25 with high grade, were chosen;and 10 normal tissues, collected from patients with cerebral trauma or cerebral hemorrhage at the same period, were chosen. Immunohistochemistry with SABC and SP methods were employed to detect the expressions of B7-H3 and Ki-67. Results B7-H3 and Ki-67 did not express in the normal brain tissues, but their expressions were detected in all glioma tissues of different grades (positive rate of B7-H3: 65.22%, that of Ki-67: 89.13%), which had significant differences (P<0.05). High-grade gliomas showed no significant differences on B7-H3 and Ki-67 expressions as compared with low-grade gliomas (P>0.05);and a positive correlation was noted between B7-H3 and Ki-67 expressions (r=0.417, P=0.014).Conclusion Being the important molecular biological factors, B7-H3 and Ki-67 participate in the development of human glioma and exhibit a synergic effect in this process.

BACKGROUND:Due to the importance of pedicle adjacent structures, once the screw replacement appears a deviation, adjacent structures may be damaged, leading to extremely serious consequences. Although the security of screw placement in thoracic vertebral pedicle-rib complex is significantly greater than that of pedicle screws, the mechanics of the pedicle-rib complex at different cross-sectional areas of the screw are rarely reported.
OBJECTIVE:To observe mechanical property of different cross-sectional area screws in the middle and upper thoracic vertebral pedicle-rib complex.
METHODS:Five specimens of adult cadaveric thoracic spine (T 1-T 10 ) and adjacent rib segment (50-60 mm long) were used. The bone density of specimens was measured using difunctional bone density testing machine, and osteoporotic vertebral body was excluded. The position of the screws was detected with CT images. The maximal withdrawal force of the pedicle screw was measured with biomechanical force test machine.
RESULTS AND CONCLUSION:Thirty-eight specimens at normal bone density were implanted with 25 screws (5.5 mm), 25 screws (6.0 mm) and 26 screws (6.5 mm). Because the pedicle screws destroyed the pedicle-rib complex and perforated the vertebral body, we final y obtained the withdrawal force of 68 screws. The axial withdrawal force of pedicle screws at different diameters was (812.36±147.22) N, (868.64±160.48) N and (946.48±157.58) N, respectively. There were significant differences between the 5.5 mm screws and the 6.5 mm screws (P<0.05). Experimental findings indicate that, the pedicle screws (diameter>5.5 mm) are suitable in the middle and upper thoracic vertebral pedicle-rib complex due to strong internal fixation and clinical requirement.

OBJECTIVETo observe the short-term clinical effectiveness of bone ring graft technique and to summarize the key points of related surgical operation to provide comprehensive clinical guidelines.

METHODSFifteen patients with severe alveolar bone absorption were selected to receive bone ring grafting and immediate dental implant. Final fixed prostheses were cemented five months after initial implantation. Cone beam CT scans were conducted on all subjects before the procedure, as well as four months post-operation to evaluate alveolar bone height and level of bone height and absorption around the implants. Four to six months after prosthesis installation, each implant's Jemt classification, gingiva attachment, and probing depth (PD) were analyzed. The difference of PD between implants and adjacent teeth, as well as the difference of the bone absorption between labial and lingual sides, was compared. The survival rate of the bone ring and the retention rate of implants were calculated. Complications and patient satisfaction were also investigated.

RESULTSBone graft survival rate was 94.4% and dental implantation retention rate was 100% four months post-operation. Average bone level increase was (6.06 +/- 1.06) mm, average bone absorption was (1.33 +/- 0.84) mm, and average bone thickness at the neck of the dental implant body was (6.94 +/- 0.73) mm. Approximately 4 to 6 months after crown restoration, average bone level increase was (5.62 +/- 1.03) mm, average bone absorption was (1.51 +/- 1.02) mm, and average bone thickness at the neck of the dental implant body was (6.77 +/- 0.72) mm. The PD around the implant body and the adjacent teeth was statistically insignificant. No major post-operative complication was observed, restorations were successful, and patient satisfaction level was high.

CONCLUSIONBone ring graft technique and immediate dental implantation are relatively simple to perform, and these techniques facilitate reduction in required treatment time. Short-term effect is reliable and satisfactory, whereas long-term outcomes require further follow up and study.