Tumor growth and migration are correlated with continuous neovascularization .Slit2-Robo1 signal pathway initially positioned in the nervous system plays an important role in the growth and neuronal axon guidance during migration.However,vascular system resembles the structural features and growth mechanism of neural system .Recent researches have shown that Slit 2-Robo1 signaling pathway plays an important role in vas-cular system,especially in tumor vessel .And Slit2-Robo1 has been shown to play a role in brain metastasis in breast cancer and supporting tumor growth in melanoma .Therefore,the role of Slit2-Robo1 in tumor growth and migration depends on the cancer type .Currently ,researches in this field show controversial results .And the status of Slit2-Robo1 signaling pathway in lung cancer is reviewed in this essay .

Dental Enamel ; surgery ; Dentin ; surgery ; Dentistry, Operative ; methods ; Humans ; In Vitro Techniques ; Laser Therapy ; methods

Background and purpose:The cinobufacini injection is a traditional antitumor drug.However,its mechanism iS still unclear.The purpose of this study was to observe the effect of cinobufacini injections in DNA TOPO Ⅰ of human hepatocellular carcinoma HcpG-2 cells.Methods:The cells that were proliferated were assessed by MTT assay.Cell cycles were shown through FCM.TOPO Ⅰ mRNA expression was analyzed through RT-PCR.The activity of TOPO Ⅰ was measured by TOPO Ⅰ mediated super coiled PHR322 relaxation.Supercoiled PBR322 was also used to determine the direct DNA breakages.Results:Cinobufacini injections significantly inhibited HepG-2 cells proliferation in ways that were dependent on dosages and time.Induced tumor cells arrest at the S-phase.TOPO ⅠmRNA expression decreased in a manner that was dependent on dosages which inhibited the TOPO Ⅰ mediated DNA relaxations.However,the cinobufacini injections could not directly induce DNA breakage at any concentration.Conclusion:Cinobufacini injections can inhibit human hepatocellular carcinoma HepG-2 cells proliferation.The regulation of topoisomerase Ⅰ activity and mRNA expression may be one of the mechanisms that causes the cinobufacini injection to contribute against tumor.

Glaucoma,especially common primary open-angle glaucoma and primary angle-closure glaucoma,shows high genetic heterogeneity. The causing-disease genes known are difficult to explain some glaucomatous cases,and the study on the susceptibial gene of glaucoma do not achieve new breakthroughs. Combined with the newest progression in genetic study of glaucoma,some views were proposed in this paper in order to better understand the updating study of the pathogenesis mechanism.

Objective To evaluate the role of extracellular signal-regulated kinase-cyclic AMP response element binding protein(ERK-CREB) signal pathway in glucocorticoid receptors-mediated chronic morphine tolerance in rats.Methods Male SD rats aged 2 months weighing 280-320 g were used in this study.A catheter was placed in subarachnoid space via foramen magnum according to Yaksh.Thirty-six rats in which intrathecal (IT) catheters were successfully implanted were randomly divided into 6 groups ( n =6 each):control group ( group C),chronic morphine tolerance group (group M),morphine + dexamethasone group (group MD),morphine + RU38486 group (group MR),dexamethasone group (group D),RU38486 group (group R).Normal saline 10 μl,morphine 10 μg,morphine 10 μg + dexamethasone 4 μg,morphine 10 μg + RU38486 2 μg,dexamethasone 4μg,RU38486 2 μg was administered IT twice a day(8:00 and 20:00)for 6 consecutive days in groups C,M,MD,MR,D,R respectively.Tail flick latency (TFL) was measured at 1 d before IT drug administration(baseline)and at 30 min after first IT drug administration during 1,3,5 d and at 1 d after last IT drug administration (T1～4).Maximum analgesic effect (MPE) was calculated.The animals were sacrificed after last TEL measurement.The L3～5 segment of the spinal cord was isolated for determination of the expression of phosphorylated ERK(pERK)and phosphorylated CREB(pCREB) by immunofluorescence staining.Results MPE was significantly T1 lower at T3,4 than at T1 in groups M and MD.Compared with group C,MPE was significantly increased,the expression of pERK and pCREB up-regulated in group M,but no significant change was found in the parameters mentioned above in groups R and D.Compared with group M,MPE was significantly increased,the expression of pERK and pCREB up-regulated in group MR,and MPE was significantly increased,the expression of pERK and pCREB down-regulated in group MD.Conclusion The mechanism by which glucocorticoid receptors-mediated chronic morphine tolerance may be associated with the inhibition of ERK-CREB pathway.

Objective Aim to set up the method of glycoprotein B genotype of human cytomegalovirus (HCMV) analysis by using nested polymerase chain reaction(nPCR) and restriction fragment length polymorphism(RFLP). Methods Eleven blood samples and twenty-three urine samples were obtained from thirty-four HCMV-infected patients. A fragment of gB gene was amplified by nPCR. HCMV gB genotyping was carried out by RFLP, and the amplified DNA fragments were verified by DNA sequencing. Results Of the 34 patients, gB type Ⅰ was found in 13 patients, gB type Ⅱ in 12 patients, gB type Ⅲ in 9 patients, and none had the gB type Ⅳ sequence. The similarities of PCR products of HCMV gB Ⅰ, Ⅱ and Ⅲ amplified compared with the sequences of prototype strains in GenBank were 98.1%～99.6%, 98.9%～100%, 97.3%～98.9%. Conclusions The nPCR assay developed in this study was sensitive and specific for detection of HCMV, and RFLP analysis of HCMV gB genotype was definite and reliable.

Objective To investigate the clinical features of anuria caused by pediatric congenital bilateral ureteral stenotic obstruction,and to improve the diagnosis and treatment of the disease.Methods This series included 7 infants(2 males and 5 females;age range,35-57 d) with congenital bilateral ureteral stenotic obstruction.The clinical presentations were characterized by sudden anuria or oliguria.B-ultrasound,cystography and puncture pyelography were performed in all of them,and magnetic resonance urography(MRU) in 3.Based on the definite diagnosis,resection of stenotic segment of the ureter or ureteral implantation was performed on them.Results The diagnosis was confirmed by puncture pyelography in all of the 7 cases.Six cases underwent phase I surgery and recovered.No ureteral stenosis and cystoureteral reflux occurred during a follow-up of 2-4 years.The renal function was normalized in them.One case had stenosis recurrence due to scar formation,and was cured by the second operation.Conclusions Anuria caused by pediatric congenital bilateral ureteral stenosis should be diagnosed and treated as early as possible.Definite diagnosis can be established by puncture pyelography and MRU.Resection of the obstructive segment of the ureter,protection of renal function,and ureteral implantation are the main therapies.

Objective To investigate the effects of desflurane and/or nitric oxide (NO) on the lung injury induced by ischemia-reperfusion ( I/R) during cardiopulmonary bypass (CPB) in children with pulmonary hypertension secondary to congenital heart disease (CHD) .Methods Forty children with CHD and pulmonary hypertension (24 male, 16 female) aged 0.6-3.7 yrs weighing 7.1-11.9 kg undergoing cardiac surgery under CPB were randomly divided into 4 groups ( n = 10 each): group control; group DES; group NO and group DES + NO. The patients were premedicated with oral midazolam 0.5 mg?kg-1. Anesthesia was induced and maintained with fentanyl and vecuronium. Radial artery was cannulated for MAP monitoring and blood sampling. Pulmonary catheter was placed under direct vision after chest was opened. The patients received inhalation of desflurane (1-1.3 MAC) (group DES)/NO (10-20 ppm) (group NO) /DES + NO (group DES + NO) immediately after pulmonary catheterization until the start of CPB. MAP, PAP, peak airway pressure (Ppeak) and compliance of respiratory system (Crs) were recorded at 5 min after induction (T0 ), 5 min before CPB (T1 ), 5 min after start of CPB (T2) and at the end of surgery (T3) . Blood samples were taken at T0 and T3 for determination of methemoglobin (Met-Hb), soluble intercellular adhesion molecule-1 (sICAM-1), XOD and MDA.Results The four groups were comparable with respect to age, M/F ratio, body weight, duration of CPB and type of operation performed. MAP was significantly decreased after inhalation of desflurane alone or desflurane + NO before CPB ( at T1) as compared to the baseline value at T0; while PAP was significantly decreased after inhalation of NO alone or NO+ desflurane before CPB (at T1) as compared to the baseline value. Ppeak was significantly lower while Crs was significantly higher at end of surgery (T3) in group NO and NO + desflurane than in control group. Blood sICAM-1 and MDA concentrations and XOD activity were significantly lower at the end of surgery (T3 ) in group DES, NO and DES + NO than in control group. Met-Hb was significantly increased at the end of surgery (T2) as compared to the baseline (T0) in group NO and DES + NO but was still within normal range. Conclusion Inhalation of desflurane and/or NO can ameliorate the lung injury during CPB in children with pulmonary hypertension secondary to CHD, in addition to inhibit the pulmonary hypertension.

Objective:To study the effects of parathyroid hormone(PTH) upon dentinogenesis by investigating the effects of hPTH1-34 on the development and calcification of parathyroidectomy rats' dentin. Methods: hPTH1-34 were injected into SD rats at different dosages after parathyroidectomy. Six weeks later lower incisors were dissected and prepared for light microscopy and image analysis. Results:The concentration of serum calcium decreased after parathyroidectomy, while increased after being injected hPTH1-34. The results of light microscopy and image analysis revealed the enlargement of the predentinal tubules and the presence of mineralization defects in the PTX group(P

Objective To investigate the expression and significance of MMP-9 and Ki67 for predicting the progres-sion and prognosis of pancreatic cancer. Methods S-P immunohistochemical method was used to detect the expressions of MMP-9 and Ki67 in 100 pancreatic cancer tissue specimens. The relationship between the expressions of MMP-9 and Ki67 and patient age, tumor size, lymph node metastasis, tumor differentiation, clinical stages and prognosis were analyzed. Re-sults There were higher expressions of MMP-9 protein 46%(46/100) and Ki67 protein 53%(53/100) in 100 samples of pancreatic adenocarcinoma. And the expressions of MMP-9 and Ki67 were inversely associated with tumor differentiation, clinical stages, and lymph node metastasis of pancreatic cancer (P＜0.05). There were no significant differences in the ex-pressions of MMP-9 and Ki67 between patient age and tumor size. The expressions of MMP-9 and Ki67 were positive corre-lated (rs=0.405,P＜0.05). Moreover, the overall survival rates were correlated with patient age, lymph node metastasis, tumor differentiation and the expression of MMP-9, but no correlation with tumor size, clinical stages, and the expression of Ki67. Conclusion The expressions of MMP-9 and Ki67 were associated with pancreatic cancer progression. And the detection of expression of MMP-9 may have practical value in prognosis in patients with pancreatic cancer.