OBJECTIVEThis study aims to investigate the temporal pattern of expression of vascular endothelial growth factor (VEGF) and new bone formation during midpalatal suture expansion osteogenesis for rapid maxillary expansion.

METHODSA total of44 New Zealand white rabbits were randomly assigned to 11 groups, namely, five experimental groups, five control groups, and one control 0 group. A Haas appliance was used for the rapid expansion of the midpalatal suture; rapid expansion was set for 2 weeks and fixed for 4 weeks. The tissue of the maxillary midpalatal suture was harvested on the day of installing rapid expansion (control 0 group), on weeks 1 and 2 for rapid expansion, and on weeks 1, 2, and 4 for fixed (experimental group and control group, respectively). The immunohistochemical method was used to detect distribution and expression of VEGF, and new bone formation was observed with periodic acid-Schiff.

RESULTSHigher VEGF expressions are observed after midpalatal suture distraction osteogenesis. Positive staining for VEGF is mainly noted in the vascular endothelial cells, and the active osteoblasts are at the edge of a newborn trabecular bone. A weak VEGF expression is detected among cells in the control group. The VEGF expression of the experimental group is higher than that of the control group in rapid expansion weeks 1 and 2 and in fixed weeks 1 and 2. The expression of VEGF in the experimental group increases significantly and peaks at fixed week 1, and then gradually decreases. The amount of newly formed bone in the experimental groups is always higher than that in the control group; moreover, it increases significantly and peaks at fixed week 2, and then gradually decreases.

CONCLUSIONThe mechanical strain created by rapid maxillary expansion generates a sequence of VEGF cellular events that lead to increased vascularization and subsequent new bone formation.

Poly ADP-Ribose Polymerase(PARP)plays an important role in the detection and repair of DNA damage.Inhibition of the PARP activity in the homologous-recombination defective cancer cell could lead to genomic instability and ultimately cause cell death.In preclinical study PARP inhibitors have demonstrated the capacity of enhancing sensitivity of cancel cells to chemotherapy agents and radiation.PARP inhibitors also showed antitumour potential in early clinical trials as monotherapy or combined with chemotherapy.

Anthracycline-based chemotherapeutic agents were extensively applied to the treatment of breast cancer. The relation of its response to TOP2A gene was proved by a number of clinical studies demonstrating that patients with both HER2 gene amplification and TOP2A gene aberration have a favored outcome,but a consensus was not yet achieved.

Objective:To evaluate the linearity change of hard tissue of the juvenile of Class II division 1 with mandible functional retrusion by IMGA. Methods: The pre- and post- treatment cephalometric of 12 juvenile patients with IMGA were analyzed in Pancherz analysis to compare the dental position and the skeletal change. Results: After treatment, as far as OLp plane, the statistical changes were significance by pg/OLp,mi/OLp,ii/OLp, co/OLp +pg/OLp,is/OLp -ii/OLp,ms/OLp -mi/OLp,is/OLp-ss/OLp(P0.05), respectively. Conclusion: The IMGA is effective on the treatment of the juvenile patients of Class II division 1 with mandible retrusion of facial hypodivergency.

Objective To evaluate the association between non-Hodgkin's lymphoma (NHL) and hepatitis B virus (HBV).Methods The positive rate of hepatitis B virus surface antigen (HBsAg) in 393 patients of NHL who were admitted. The colorectal cancer patients and healthy persons were also enrolled as control. Results The positive rate of HBsAg in NHL patients (26.5 ％) was significantly higher than that in colorectal cancer patients (14.5 ％) and healthy persons (8.8 ％),respectively (x2=55.713,P＜0.001).The characteristics of HBV-infected patients with NHL were similar to those who were HBV-uninfected in terms of sex,stage and B symptoms,whereas the HBV-infected patients were younger than the HBV-uninfected patients (the median age was 47ys vs 52ys,t =-1.911,P=0.021).In the HBsAg-positive NHL group,B-cell subtype was much more common than T-cell subtype (80.8 ％ vs 15.4 ％,P=0.043).Regarding colorectal cancer patients and healthy persons as control groups,the positive rate of HBsAg was significantly higher in B-cell NHL patients than that in the control groups, respectively ( 29.6 ％ vs15.5 ％ vs 8.8 ％,Wald value were 25.174 and 55.139,respectively,P＜0.001).The positive rate of HBsAg of HBV between T-cell NHL (16.7 ％) and control groups were not significantly different. Conclusions An association is present between HBV infection and NHL,especially in B-cell subtype.

Objective To evaluate the association between B-cell non-Hodgkin lymphoma (NHL) and hepatitis B virus (HBV).Methods The positive rates of HBV markers in 284 patients of B-cell NHL who were admitted to our department between January 2003 and December 2009 were investigated.The positive rates of HBV markers in colorectal cancer patients were used as controls.Results The HBsAg-positive rates of patients aged 18～ 39 and stage m/Ⅳ patients were 42.6 ％ (26/61) and 37.0 ％ (50/135),which was higher than other groups.The x2 value and P value were 7.573 and 6.874,0.023 and 0.009,respectively.Compared with the control group, the B-cell NHL had significantly higher prevalence of positive HBsAg and positive HBeAg (29.6 ％ vs 14.5 ％,6.7 ％ vs 0.8 ％ ).The Wald values were 25.174 and 20.496,respectively.Both of the P value were ＜0.001 and lower prevalence of positive anti-HBs (45.4 ％ vs 58.0 ％,Wald =11.062,P =0.001).The coexpression of HBsAg, HBeAg and anti-HBc was higher in the B-NHL group than in the control group (6.0 ％ vs 0.8 ％,x2 =31.619,P ＜0.001).Similarly,the coexpression of HBsAg,anti-HBe,and anti-HBc was higher in the B-NHL group (16.2 ％ vs 11.5 ％,x2 =4.542,P =0.033).Significantly higher rate of positive anti-HBc and negative anti-HBs was observed in the B-NHL group (37.0 ％ vs 24.5 ％,Wald =17.708,P ＜ 0.001),whereas the same group showed a lower rate of negative anti-HBs compared with the control group (20.8 ％ vs 27.8 ％, Wald =5.646, P =0.017).Conclusion This finding of a positive association between HBV infection and B-NHL suggests that HBV may play an etiologic role in the induction of B-NHL.

Progesterone has nongenomic effects on inducible nitric oxide synthase (iNOS), which is mediated by mitogen activated protein kinase (MAPK) pathways. This effect is supposed to have some potential association with asymptomatic gonococcal infections in women by immunological depression. In this study, polymorphonuclear leukocytes (PMNs) challenged by gonococci were used to study the nongenomic effects of progesterone. The activation of iNOS was assessed by measuring [(3)H] L-arginine converses to [(3)H] L-citrulline, and the activity of MAPK was detected by Western blot. It was found that the activity of iNOS and the yields of NO were enhanced significantly in gonococci-challenged PMNs compared with the controls (P<0.01). Progesterone could repress the activation of iNOS through P38MAPK pathway within PMNs (P<0.05), which could be blocked by SB203580 (P<0.01), but not by actinomycin D (P>0.05). It was also found subsequently that in the serum specimens collected from gonococci-infected but asymptomatic women, the progesterone level was higher than that in women with severe symptoms (P<0.01). Moreover, the yield of NO had an inverse correlation with progesterone. With these results it suggested that the rapid nongenomic effects of progesterone may inhibit iNOS activation and NO yields mediated by P38MAPK pathways, which were supposed to be concerned with asymptomatic women infected with gonococci.

Aim Toclarifytheeffectofacteosideon proliferation of neural stem cells (NSCs ) from adult mice,as well as the involved signaling pathway.Meth-ods NSCswereisolatedfromthesubventricularzone (SVZ)of adult C57BL/6 mice,then identified by im-munofluorescence staining with Nestin,the marker of NSCs.NSCs were exposed to acteoside (5,10,20,40μmol·L-1 )in absence of mitogen(EGF/bFGF)for 24 h.We employed CCK8 assay to detect NSCs viability and BrdU staining to identify NSCs proliferation.We performed Western blot to quantify the expression level ofp-AktinducedbyacteosideonNSCs.Results With-out mitogen,acteoside increased NSCs proliferation by activating p-Akt,which can be blocked by LY294002, the inhibitor of PI3K/AKT signaling pathway.Conclu-sion ActeosidepromotestheproliferationofNSCsfrom adult mice by activating PI3K/AKT pathway.

Objective: To express the protein of HPV18E6 based on pET-32a(+) at high level and study the expression and significance of HPV18E6 proteins in laryngeal carcinoma. Methods: The HPV18E6 gene was amplified by PCR and cloned into pET-32a(+). The amplified fragment was inserted into the plasmid pET32a (+) that was digested with BamHⅠand Hind Ⅲ. The recombinant plasmid pET32/E6 was transformed into E.coli JM109 which was selected with ampicillin. The recombinant plasmids were successfully introduced into E.coli BL21(DE 3) and were induced by IPTG. SDS-PAGE and Western blot analysis were used to detect the confusion protein. Finally, the optimization of expression conditions, such as temperature, concentration of IPTG, was studied. Results: The recombinant plasmids were identified and confirmed with enzyme digestion and sequencing. The BL21(DE3) transformed recombinant plasmid pET32/E6 had expressed HPV18E6 recombinant protein effectively. The optimum conditions of expression were 37 ℃, 1 mmol/L IPTG. Conclusion:Prokaryotic expression vector pET-32a(+)-HPV18E6 was successfully constructed. The high-level expression of HPV18E6 was achieved in E.coli BL21(DE3).

Objective To determine the prevalence,trends and risk factors of drug-resistant tuberculosis (TB) in Ningbo during 2007-2010,and to explore the efficient control strategy of drugresistant TB.Methods A cross-sectional study of regional anti-TB drug resistance was conducted in Ningbo.The registered and culture-positive TB patients were enrolled and drug sensitivity test was performed.The demographic and clinical information were collected from the national TB report system.Logistic regression model was used to determine the risk factors of drug resistance.Results Of 1613 enrolled TB patients,39.3％-48.3％ were resistant to any first-line anti-TB drug and 14.0％-19.9％ were multidrug resistant (MDR)-TB.The proportion of new cases resistant to any first-line anti-TB drug was 35.4 ％-42.1％ and MDR TB was 9.8％- 12.2 ％,which were both significantly lower than those of retreated patients (69.5％-72.7％ and 33.9％ - 54.5％,respectively).The multivariate Logistic regression model showed that anti-TB treatment history and migration were significantly associated with any drug resistance (OR=3.298,95 ％ CI 2.391 4.550and OR=0.771,95 ％CI 0.608 - 0.978,respectively) ; while age,treatment history and migration were also significantly associated with MDR-TB.Conclusions Drug-resistant TB prevalence showed a decrease trend in Ningbo,while the resistant rates in both new cases and retreated cases still remain at high levels. Improved case management,including directly observed treatment short-course and appropriate treatment regimens specifically for drug-resistant TB,should be developed to prevent further transmission and development of drug-resistant TB in this setting.