Background Retninal neovascular diseases caused by hypoxia has become a major blinding disease,which is lack of effective chemical treatment currently,it's important to study the molecuar mechanism of the disease,so as to guide the clinical medication.Objective This study was to explore the effect of 15 (S)-hydroxyeicosate traenoic acid (15-HETE) on the proliferation of hypoxic retinal microvascular endothelial cells (RMVECs) and its probable mechanism.Methods RMVECs were isolated from C57BL/6J mice and incubated and then identified with anti-Ⅷ factor antibody by immunochemistry and immunofluorescence.The cells were divided into the normoxia group and the hypoxia group.The hypoxia cell models were established by treated with 125 μmol/L CoCl2.The cells were cultured with serum-free DMEM containing endothelial cell growth supplement (ECGS)and high glucose for 48 hours,and then different concentrations of 15-HETE (0.0,0.1,1.0,5.0 μmol/L) were added in the medium for 48 hours respectively to subgroup the groups.The proliferation of the cells (absorbance,A) was detected using MTT.The relative expression levels of protein and mRNA of hypoxia inducible factor-1α (HIF-1α),bcl-2 and caspase-3 were assayed by reverse transcription PCR (RT-RCR)and Western blot.Results The cells showed the positive response for anti-Ⅷ factor antibody with the positive rate of (94.38 ±4.25)％.No significant difference was found in the cell proliferation of various groups under the normoxia condition (F =0.283,P =0.837),but under the hypoxia condition,the proliferation values were significantly different among various groups (F =702.582,P＜0.001).The cell proliferation value in the 1.0 μmol/L 15-HETE group and 5.0 μmol/L 15-HETE group was lower than that of the simple hypoxia group respectively(both at P＜0.05).The inhibitory rates in the 0.1,1.0,5.0 μ mol/L 15-HETE groups were (1.09±0.31) ％,(21.09± 3.53) ％ and (49.86 ±4.15) ％,showing a dosedependent manner.No significant difference was seen in the expression levels of bcl-2,caspase-3 and HIF-1α mRNA in various groups under the normoxia conditions.However,compared with the simple normoxia group,the relative expressions of bcl-2 mRNA and HIF-1α mRNA in the cells were increased by 1.53 folds and 1.7 folds in the simple hypoxia group respectively,and caspasse-3 mRNA expression decreased by 70％ (all at P ＜ 0.05).Under the normoxia condition,the expression of bcl-2 and pro-caspase-3 protein in the cells were not significantly different among the various groups (P＞0.05),however,the expressions of bcl-2 and pro-caspase-3 proteins were elevated by 1.6 folds and 1.9 folds in the hypoxia group in compared with the normoxia group (P＜0.05).Compared with the simple hypoxia group,the expressions of bcl-2 and pro-caspase-3 were lowed by 40.4％ and 42.5％ in the 5.0 μmol/L 15-HETE group (P＜0.05).Conclusions 15-HETE inhibits the proliferation of RMVECs and therefore suppresses neovascularization by down-regulating the expressions of HIF-1α and bcl-2 and the activation of caspase-3 in a dose-dependent manner.

Objective To explore the clinical head nurses'effective competence through interviewing nursing supervisors by in depth interview method and to provide reference for constructing training content for clinical head nurses in Macau and Guangzhou.Methods In depth interview was carried out among 8 nursing supervisors from 2 hospitals in Macau and 9 nursing supervisors from 2 tertiary hospitals in Guangzhou.Content analysis was utilized through organizing records and then forming written documentations.Results The themes were drawn after the interview,which were good moral character accomplishment,good communication skill,prospective and creative thinking,favorable executive ability.Forwardlooking and innovative were significantly different in Macau and Guangzhou.Conclusions The effective clinical head nurses' competence is multi-faceted,the results can provide reference for selection,evaluation and training for head nurses.

A Mn-clusters-porphyrin metal-organic framework nanosheet(nMn-MOF)was synthesized by coordination chelation to enhance photodynamic therapy. The nanosheet was characterized by dynamic light scattering, transmission electron microscopy and X-ray photoelectron spectroscopy. Oxygen sensor and ICG were used to investigate the production of oxygen and the singlet oxygen(1O2)generation. The cytotoxicity of the nanosheet against tumor cells were detected by CCK-8 assay, and the anti-hypoxia and oxygen-generation ability of nanosheets were investigated by fluorescence staining assay. The results indicated that this nanosheet could catalyze the intracellular H2O2 into O2, which overcame the tumor hypoxia. Furthermore, the generated oxygen was converted to cytotoxic 1O2 under the near infrared light irradiation, thereby enhancing photodynamic therapy.

Abstract:Photodynamic therapy(PDT)is a minimal invasive therapy that have been clinically approved for the cancer treatment with selective cell toxicity. When activated by appropriate wavelength of light, photosensitizers transfer the absorbed photon energy to the surrounding molecular oxygen to generate reactive oxygen species, which result in cell death, vessel damage and immune activation of tumor site. This paper summarize the main challenges and recent solutions for PDT application, such as the low tissue penetration of light, toxicity induced by nonspecific accumulation of skin and poor PDT effect of hypoxia tumor.

Gas chromatography-mass spectrometry (GC-MS) method was established for trace analysis of the potential genotoxic impurity chlorocyclohexane in trihexyphenidyl hydrochloride bulk drug, utilizing an RXI-5SIL MS column at isothermal temperature of 60 °C for the entire 6-minute run time.The inlet temperature was 180 °C and a split ratio of 10∶1 was used with the injection volume of 1.0 μL.The selective ion monitoring mode was set at m/z 82 for chlorocyclohexane with a detector voltage of 0.3 kV and an ion source temperature of 240 °C.The method was verified with respect to specificity, limit of detection (LOD), limit of quantitation (LOQ), accuracy, precision and robustness.Good linear correlation was achieved with coefficient r of 0.999 9 in the concentration range of 59.72-493 ng/mL.The intra- and inter-day precision was satisfactory (RSD ≤ 5.0%) and robust (RSD ≤ 1.65%).The proposed method in this study can be adequately adopted as a tool for quality assurance of trihexyphenidyl hydrochloride in routine test of potential genotoxic impurity.

After several in -depth investigations on the third party mediation mechanism of "Guangdong mode" in Guangdong Harmony Medical Dispute Mediation Committee and combined with the analysis of the domes-tic and foreign medical dispute disposal experience , this paper summed up five points that successful construction of harmonious mediation mechanism should grasp .The five points include the fairness of harmonious mediation thoughts , the feasibility of harmonious mediation paths , the justice of harmonious mediation mechanism , the suita-bility of harmonious mediation environment and the success of harmonious mediation results .Only when grasp these five points, couldit create a gradually harmonious doctor -patient relationship .

Objective To investigate the clinical significance of plasma methylated Septin 9 (SEPT9)gene test for colorectal cancer(CRC).Methods Clinical data of this retrospective study were obtained from Huashan Hospital of Fudan University(2016-2017).The subjects were divided into three groups,84 patients in CRC group,50 patients with adenoma in precancerous group,and 20 cases as healthy controls.A fluorescent PCR assay was used to analyze SEPT 9 methylation in DNA extracted from plasma. Chi square test was used for statistical analysis.Results The positive incidence of SEPT9 gene methylation in plasma was 63.1%(53/84)in CRC group,significantly higher than 10%(5/50)in precancerous group (χ2=35.993, P<0.001), and undetectable in healthy group.The sensitivity of the methylated SEPT9 gene test was 63.1%(53/84), and the sensitivity of a joint detection combined with carcinoembryonic antigen(CEA)was 75%(63/84).The receiver operating characteristic curve(ROC)showed that methylated SEPT9 gene test had 0.828 in the area under the curve(AUC),higher than 0.795 in the AUC of CEA test.In CRC patients,51.4%(19/37)in the stage Ⅰ-Ⅱand 72.3%(34/47)in the stage Ⅲ-Ⅳ were positive for methylated SEPT9 gene test(χ2=3.917, P<0.05).There were no significant differences in gender,age and primary tumor site.Conclusion The SEPT9 gene methylation in plasma is helpful for early screening for CRC,and is associated with CRC progression.

The study aimed to achieve enhanced targeted cytotoxicity and cell-internalization of cisplatin-loaded deoxyribonucleic acid-nanothread (CPT-DNA-NT),mediated by scavenger receptors into HeLa cells.DNA-NT was developed with stiff-topology utilizing circular-scaffold to encapsulate CPT.Atomic force microscopy (AFM) characterization of the DNA-NT showed uniformity in the structure with a diameter of 50-150 nm and length of 300-600 nm.The successful fabrication of the DNA-NT was confirmed through native-polyacrylamide gel electrophoresis analysis,as large the molecular-weight (polymeric) DNA-NT did not split into constituting strands under applied current and voltage.The results of cell viability confirmed that blank DNA-NT had the least cytotoxicity at the highest concentration (512 nM) with a viability of 92％ as evidence of its biocompatibility for drug delivery.MTT assay showed superior cyto-toxicity of CPT-DNA-NT than that of the free CPT due to the depot release of CPT after DNA-NT inter-nalization.The DNA-NT exhibited targeted cell internalizations with the controlled intracellular release of CPT (from DNA-NT),as illustrated in confocal images.Therefore,in vitro cytotoxicity assessment through flow cytometry showed enhanced apoptosis (72.7％) with CPT-DNA-NT (compared to free CPT;64.4％).CPT-DNA-NT,being poly-anionic,showed enhanced endocytosis via scavenger receptors.

Objective To investigate the clinical features,diagnosis,treatment and prognosis of disseminated aspergillosis in children with leukemia after chemotherapy.Methods The clinical features and treatment of 3 leukemia children after chemotherapy complicated with disseminated aspergillosis were retrospectively analyzed.Results The underlying diseases of all recruited cases were leukemia,which occurred many high-risk predisposing factors for invasive fungal diseases.The major clinical features of disseminated aspergillosis in children with leukemia were prolonged and antibiotics uncontrollable fever,subcutaneous solid nodules,nodules or cavities in pulmonary CT,spread low density lesions in hepatosplenic and kidney in abdominal MR(T2 weighted)and positive serum aspergillus galactomannan(GM).The diagnosis of invasive fungal disease was proven by histopathologic examination.Amphotericin B lipid complex was selected in antifungal therapy for 2 patients and the course of treatment was more than 4 weeks.Moreover,chemotherapy was advised for the 2 patients when clinical manifestations of disseminated aspergillosis improved significantly,neutrophil counts recovered and images did not deteriorate.The patients received voriconazole treatment with follow-up from 6 months to 12 months,and then disseminated aspergillosis was cured up to the standard.1 case received complete remission and was still alive until follow-up period,1 case was died of leukemia relapse because of suspension demand from the family members,and the other 1 case was died of no response or serious adverse drug reactions,uncontrolled infection,and leukemia relapse because of long-term chemotherapy suspension.Conclusions Patients with leukemia after chemotherapy may present with the following manifestations,including fever,subcutaneous solid nodules,pulmonary nodules or cavities,spread low density lesions in hepatosplenic and kidney and serum aspergillus GM antigen positive,which may indicate disseminated aspergillosis.The improvement of prognosis depends on effective and adequate antifungal treatment and chemotherapy for leukemia at the right time.

Objective To summarize the long-term outcomes and safety of childhood Hodgkin lymphoma (HL) with protocol ABVD. Methods The clinical data of 20 children with HL admitted to the Union Hospital of Fujian Medical University from July 2010 to June 2017 were retrospectively analyzed. Among the 20 children with HL, 15 were male and 5 were female. The median age of initial diagnosis was 6.5 years old (3-12 years old). The pathological types were as follow: 1 case was nodular lymphocyte-predominant HL (NLPHL) and 19 cases were classical HL (cHL), including 9 cases of mixed cell type, 9 cases of nodular sclerosis type and 1 case of lymphocyte rich type. Basing on Ann Arbor staging system, 1 patient was evaluated as stage Ⅰ, 4 patients were stage Ⅱ, 10 patients were stage Ⅲ, and 5 patients were stage Ⅳ. There were 3 patients in the low-risk group, 7 patients in the intermediate-risk group, and 10 patients in the high-risk group. There were 9 patients with B symptoms. All patients were treated with the ABVD regimen. Results All the 20 patients completed all chemotherapy courses. After 2 courses, the effective rate was 100％(20/20), including 12 cases of complete remission (CR) and 8 cases of partial remission (PR). After the treatment, 19 cases achieved CR, and at the end of the 6 courses, the evaluation showed that 1 case had residual lesions. Follow-up to February 2018, clinical symptoms of 18 cases achieved CR, 2 cases relapsed (all high-risk group); the median follow-up time was 42 months (10.1-87.9 months), the overall survival rate was 100 ％ (20/20), the estimated 5-year rate of freedom from treatment failure (FFTF) was (89.1 ±7.3) ％.Conclusions According to the risk stratification, ABVD regimen has good safety and long-term efficacy for children with cHL. Even the patients in low-risk or intermediate-risk group do not achieve CR after 2 courses and do not receive radiotherapy, the prognosis of them is still good.