Objective:To examine the changes of matrix metalloprotein as e-2 (MMP-2) and tissue inhibitors of matrix metalloproteinase-2(TIMP-2) in g ingival crevicular fluid(GCF) after periodontal initial treatment of adult perio dontitis pateins. Methods:42 teeth of 42 adult periodontitis pat eins and 42 teeth of 42 periodontal healthy subjects were included.GCF was samp led with filter paper strips by intra-pocket methed. Assays for MMP-2 and TIM P-2 in GCF were performd by ELISA.Results:Levels of MMP-2 and TIMP-2 were higher in patients than that in the controls(P

OBJECTIVE: To discuss the possibility and prospect of umbilical cord blood mesenchymal stem cells as seed cells of bone tissue engineering. DATA SOURCES: References came from Medline and Embase between January 1980 and December 2005 with the keywords of "umbilical cord blood,mesenchymal stem cell,bone tissue engineering" in English. Besides, CBM and CBMdisc databases were retrieved by computer for the articles of umbilical cord blood mesenchymal stem cells in bone tissue engineering published between January 1990 and April 2004 with the same key words in Chinese. STUDY SELECTION: Related articles of culture and identification of umbilical cord blood mesenchymal stem cells and the progress of bone tissue engineering. Inclusive criteria: ①basic research of culture and identification of umbilical cord blood mesenchymal stem cells, and ②the progress of bone tissue engineering. Exclusive criteria: reduplicative studies. DATA EXTRACTION: There were 47 relevant articles of umbilical cord blood mesenchymal stem cells and bone tissue engineering, and 30 were accorded with the inclusive criteria. The excluded 17 were due to the reduplicative contents. DATA SYNTHESIS: Under special conditioned medium, umbilical cord blood mesenchymal stem cells not only could differentiate into osteogenic, chondrogenic and adipogenic cells, but also transform into nerve cells, liver cells, somatic muscle cells and so on. Umbilical cord blood mesenchymal stem cells were safe and easy to obtain from umbilical cord blood, safe to transplant, easy to expand in vitro, stable in biological characteristics, which met the requirements of bone tissue engineering. CONCLUSION: Umbilical cord blood mesenchymal stem cells are a promising alternative of ideal seed cells of future bone tissue engineering on the basis of its characteristics.

Objective To investigate the qualitative diagnosis of salivary gland mass with contrastenhanced ultrasound(CEUS).Methods The CEUS manifestations in 78 cases with salivary gland mass were observed after intravenous bolus injection with contrast agent SonoVue and confirmed by histology.Results Among 78 salivary gland masses,there were 29 cases with pleomorphic adenomas (37.2％),19with Warthin's tumors (24.4 ％),7 with basal cell adenomas (8.9 ％),and 11 with the other benign masses (14.1％),12 with malignant tumors (15.4％).The intensity of contrast-enhanced masses,whether the enhanced mass margin was clear,whether the peripheral enhancement rim was complete and whether the mass was enlarged were the diagnostic criteria to differentiate the benign and malignant tumors.The accuracy,the sensitivity,specificity,positive predictive value and negative predictive value were 87.2％,95.2％,56.3％,89.4％,75.0％ respectively,and the results also displayed positive likelihood ratio and negative likelihood ratio were 2.178,0.085 respectively.Although they presented with the highest incidence among benign tumors,their CEUS manifestations showed remarkable statistical differences when the pleomorphic adenoma was compared with Warthin' s tumor and basal cell adenoma respectively in enhancement intensity(P ＜0.01) while there were no statistical differences between Warthin's tumors and basal cell adenomas (P ＞0.05).Conclusions CEUS manifestations of salivary gland mass were helpful to the differential diagnosis of various salivary gland tumors.

Objective To explore the causes,clinical manifestations,diagnosis and treatment method of femoral artery pseudoaneurysms (IFPSA) after ultrasound-guided percutaneous coronary intervention.Methods Ultrasound-guided repair by compression was applied to all cases,of which the failed cases were treated with ultrasound-guided thrombin injection.Results IFPSA was confirmed by ultrasound imaging in 39 cases,18 of which were cured by compression repair,with the average compression duration of (36.78 ± 1.71 )min.Another 21 cases were cured by the thrombin injection,after compression repair failed,with average time for thrombosis (0.33 ± 0.06 )min.All the patients were re-evaluated by ultrasound 24 h after treatment,confirming the successful closure of the pseudoaneurysms.No recurrence of pseudoaneurysm was observed during a half-year post-operative follow-up.Conclusion Ultrasound-guided compression repair and ultrasound-guided thrombin injection into the cavity are safe and effective treatments for femoral arterial pseudoaneurysms after coronary intervention.

Objective To investigate the clinical application of pulse indicator continuous cardiac output (PICCO) target oriented role monitoring technique on hemodynamics in patients with intractable heart failure.Methods Eighteen patients with intractable heart failure were selected as control group and received regular treatment including internal medicine under monitoring by central venous pressure.Another 18 patients with refractory heart failure were selected as PICCO group and given the internal medicine under PICCO monitoring.Intrathoracic blood volume index(ITBVI),global end diastolic volume index(GEDVI),extravascular lung water index (EVLWI),cardiac index (CFI),N-terminal B type natriuretic peptide precursor(NT-proBNP) and left ventricular ejection fraction(LVEF) were recorded.The data including mortality rate,ventilation time,intensive care time,APACHE Ⅱ score and the re-hospitalization rate were also record at 28th day.Results Compared with before treatment,ITBVI,GEDVI,EVLWI in PICCO group were (1 282.6 ± 196.4) ml/m2,(1 026.8 ±92.1) ml/m2,(12.9 ± 5.5) ml/kg respectively,significant different from that before treatment ((907.4±78.3) ml/m2,t =8.75,P =0.001; (715.2 ±61.8) ml/m2,t =6.48,P =0.003; (6.5 ± 1.2)ml/kg),t =2.94,P =0.033) and they are all back to normal level.The indices of CFI,NT-proBNP,LVEF in PICCO group were improved than before treatment (CFI:(3.1 ±0.5) L/min vs.(4.8 ± 1.3) L/min,t =2.56,P=0.042) ;NT-proBNP:(6 438.3 ±249.5) ng/L vs.(1 371.6 ±87.5) ng/L,t =5.12,P =0.019) ;LVEF:(26.9±3.1)％ vs.(54.3 ±2.5)％,t =2.62,P =0.040)).Mortality at 28th D in PICCO group was 16.7％,lower than that of control group (33.3％,x2 =4.99,P =0.026).The indices of assisted ventilation time,intensive care time,APACHE score of lⅡ and the rehospitalization ratein PICCO group were better than that of the control group ((8.5 ±2.3) dvs.(3.2±0.8) d,t=24.31,P＜0.05;(14.9±2.3) dvs.(8.3 ±2.0)d,t=12.26,P=0.002;(23.4±1.3) vs.(14.7±1.6),t=9.52,P=0.011;38.9％ vs.11.1％; t=5.79,P =0.020).Conclusion PICCO provides effective guidance for intractable heart failure patients hemodynamic monitoring of goal orientation.

Objective To evaluate the effect of sevoflurane on activation of nuclear factor kappa B (NF-κB) during brain injury induced by hemorrhagic shock (HS) in pigs.Methods Thirty-two adult male Bama miniature pigs,aged 6 months,weighing 22-25 kg,were divided into 4 groups (n=8 each) using a random number table:sham operation group (group Sham),HS group,sevoflurane preconditioning group (group Sev-Pre) and sevoflurane postconditioning group (group Sev-Post).The animals were anesthetized,and tracheostomized and mechanically ventilated.In group Sham,the bilateral femoral arteries and internal jugular veins were only cannulated.HS was induced by removing 40％ of blood volume within 15 min (30 ml/kg) via the right femoral artery and maintaining at this level for 1 h before resuscitation in HS,Sev-Pre and Sev-Post groups.In group Sev-Pre,2％ sevoflurane was inhaled for 30 min,and then HS was induced.In group Sev-Post,2％ sevoflurane was inhaled for 30 min starting from the time point immediately after HS was induced.Immediately before establishment of the model and at 30,60,90,120,180 and 240 min of HS (T1-6),blood samples from the jugular vein were collected for determination of serum interleukin-1beta (IL-1β) and tumor necrosis factor-alpha (TNF-α) concentrations by enzymelinked immunosorbent assay.At 4 h of HS,the rats were sacrificed,and brains were removed for microscopic examination of hippocampal CA1 region (using haematoxylin and eosin staining) and for determination of the expression of NF-κB in nucleoprotein (by Western blot).Results Compared with group Sham,the concentrations of serum IL-1β and TNF-α were significantly increased at T2-6,and the expression of NF-κB in nucleoprotein in hippocampal CA1 region was up-regulated in HS,Sev-Pre and Sev-Post groups (P＜0.05).Compared with group HS,the concentrations of serum IL-1β and TNF-α were significantly decreased at T3-6,and the expression of NF-κB in nucleoprotein in hippocampal CA1 region was down-regulated in Sev-Pre and Sev-Post groups (P＜0.05).There were no significant differences between group SevPre and group Sev-Post in concentrations of serum IL-1β and TNF-α and expression of NF-κB in nucleoprotein in hippocampal CA1 region (P＞0.05).The pathologic changes were significantly attenuated in SevPre and Sev-Post groups as compared with group HS.Conclusion The mechanism by which sevoflurane attenuates brain injury induced by HS may be related to inhibition of NF-κB activation and reduction of inflammatory responses in pigs.

Objective To study whether specific IL-1B+3954/Taq Ⅰ genotype alleles are associated with chronic periodontitis (CP) in Chinese of the Han nationality. Methods CP group consisted of 66 patients while healthy controls group consisted of 50 subjects. Anti-coagulated peripheral blood sample was obtained from each subject and genomic DNA was extracted from each sample. Single nucleotide polymorphisms (SNPs) at IL-1B+3954/Taq Ⅰ were analyzed by standard polymerase chain reaction-restriction fragment length polymorphisms (PCR-RFLP) assay. Results In the control group,higher numerical values of the A1/A1 genotype were observed for the IL-1B+3954/Taq Ⅰ SNPs (84.0%),and the A2+ genotype was present in 16% of this sample. Statistical analysis revealed no significant difference between the two groups. Conlusion There is no evidence in our study supporting the association between single nucleotide polymorphisms (SNPs) of the IL-1B+3954/Taq Ⅰ gene and prevalence and/or severity of chronic periodontitis.

Objective To analyze the epidemiological characteristics of reported emergency public health events at schools from 2006 to 2013, and provide a scientific basis for better disposal of school-related events. Methods The reported emergency public health events at schools in Tianjin from 2006 to 2013 were collected, and descriptive epidemiological analysis was conducted on data. Results A total of 267 reported emergency public health events at school in Tianjin during 2006-2013, of which 257 infectious disease events, accounting for 96.25%. The incident occurred in primary schools and nurseries. The peak was from March to June and October to December for the incident. The top three species of disease onset were influenza (2 360 cases), chicken pox (2 032 cases) and mumps (1 813 cases). There was a correlation between the duration and interval from onset of the first case to report of emergency public health events(rs=0.522,P＜0.05). Conclusion In recent years, school public health emergency events are high momentum, mainly in rural areas, primary schools and nurseries. Timely detection and disposal of emergency public health events can reduce the harm generated by them.

Objectives This study was designed to explore the function of ATP binding cassette transporter 1 ( ABCA1) and ApolipoproteinA-I (ApoA-I) in cholesterol reverse transportation ( RCT) , the influence of lovastatin and rosiglitazone on the concentration of cholesterol ( CHO) in THP-1 ( human monocytic leukemia cell line) derived foam cells.Methods LDL from healthy volunteers was obtained by density-gradient ultracentrifugation and was oxidized by incubation with Cu2+ and ox-LDL was identified.Macrophages were induced from THP-1 cell by phorbol ester (PMA).Models of foam cells were built by incubating macrophages with oxLDL.The effect of lovastatin and rosiglitazone on ABCA1 protein expression in THP-1 cell line derived macrophage were detected by western blot Foam cells were divided into 9 groups: control, ApoA-I, lovastatin, rosiglitazone lovastatin + ApoA-I, rosiglitazone + ApoA-I, ABCA1 monoclonal antibody pretreatment + ApoA-I, ABCA1 monoclonal antibody pretreatment + lovastatin + ApoA-I, ABCA1 monoclonal antibody pretreatment + rosiglitazone + ApoA-I.The concentration of intracellular CHO in each group was detected by using cholesterol kit Results As compared with control group, there are no big differences of CHO concentration within the cell of group lovastatin, rosiglitazone, and each ABCA1 monoclonal antibody pretreatment group (P >0.05), but the CHO concentration within the cells of group ApoA-I, lovastatin + ApoA-I, rosiglitazone + ApoA-I decreased obviously as compared with the control (P <0.05), and CHO concentration in group rosiglitazone + ApoA-I have a further decrease than the former two groups ( P < 0.05 ).Conclusions CHO concentration can be descreased in foam cells by cooperation of ABCA1 and ApoA-I mediate cholesterol efflux.Rosiglitazone can enhance this procedure in THP-1 macrophages derived foam cells which means that they can promote ABCA1 mediated cholesterol reverse transportation through improve ABCA1 protein expression.

Objective To explore the role of homocysteine(Hcy)on angiogenesis at peri infarct region after focal cere-bral ischemia in rats, to elucidate inhibitory factors of angiogenesis, and to establish a clinic foundation for clinical brain functional recovery. Methods Spragur-Dawley (SD) male rats (n=36) were randomly divided into three groups with 12 rats in each group including Sham Operation (SO) group, Middle cerebral artery occlusion (MCAO) group and MCAO+Hcy group. The rats in Sham and MCAO groups were intra-peritoneally injected with 5 mL/(kg·d) saline and rats in MCAO+Hcy group were injected with 2%5 mL/(kg·d) Hey solution from the same route. MCAO was introduced by intraluminal filament meth-od after 7 d Hcy intervention. Rat brains were harvested on the 7th day after MCAO. BrdU(50 mg/kg, as a marker of cell pro-liferation)was intraperitoneally injected three days before the rats were killed. High performance liquid chromatography (HPLC)was used to measure serum Hcy concentration in rats. Brain infarction size was observed by TTC staining. Immuno-fluorescence staining was used to detect the number of BrdU+/laminin+cells at the thalamus of infarction side. Results Se-rum Hcy concentration significantly higher in MCAO+Hcy group than in SO and MCAO groups(P<0.05). Brain damage increased and the number of BrdU+/laminin+cells decreased in MCAO+Hcy group compared with those of MCAO group (P<0.05). Conclusion Increased Hcy concentration in rats lead to more severe damage of cerebral infarction as well as to inhibit the angiogenesis at surrounding ischemia area.