BACKGROUND: Electrostatic layer-by-layer (LbL) self-assembly is a simple, effective and novel approach to carrying macromolecules into microcapsule carriers.OBJECTIVE: To prepare chitosan (CS) microcapsules to control the releasing of heparin (Hep) by LbL.METHODS: CS microspheres were fabricated by a sodium sulfate-based precipitation process and then used as positively charged templates for polyelectrolyte multilayer coatings to carry heparin by the LbL self-assembly technique. The polycation was CS and the polyanion was Hep. The microcapsule was formed via coating {CS/Hep}3 on CS hydrogel template. The microcapsules composed of {CS/ Hep}3 on CS hydrogel templates were confirmed by fluorescence inverted microscopy, confocal laser scanning microscopy and laser particle size analysis. The assembly of polyelectrolyte layers on CS hydrogel microspheres was monitored by Zeta Potential Analyzer.RESULTS AND CONCLUSION: The resulting microcapsules were about 1 μm in average diameter, and allowed spontaneous loading of heparin through electrostatic interaction, with the encapsulation efficiency and carrying capacity of 83.8% and 3.05%, respectively.

Objective Current research proposed that lid-wiper epitheliopathy may be a early symptom of dry eye.At present,there are seldom studies on lid-wiper epitheliopathy in both home and abroad.This study was to investigate the effect of artificial tears without antiseptic in the treatment of lid-wiper epitheliopathy and discuss the method of treatment of lid-wiper epitheliopathy. MethodsThis is a case-observative study.Seventy patients with lid-wiper epitheliopathy and with negative results in tear film break-up test,SchirmerⅠtest and corneal fluorescine staining were enrolled in the Peking University First Hospital during September 2006 and June 2008.The treatment group included 54 eyes of 54 patients who received topically free-antiseptic artificial tears (dextran 70 eye drops) four times per day for two weeks,and the control group included 16 eyes from 16 patients who were not treated.Dry Eye Questionnaire were taken from the patients before the administration of drug and 2 weeks after treatment.Fluorescein and Lissamine green double-staining was used before and after treatment for the evaluation of lid-wiper epitheliopathy.The disease was graded into 0 (absence) to 3(severe),and the symptoms and dye were scored following the Standard Patient Evaluation of Eye Dryness (Korb criteria).Informed consent and good compliance were obtained before initial and during the therapy duration. ResultsIn the treatment group,the scores of symproms and staining were significantly different between before and after administration of drug (12.91±2.55 vs 2.78±2.27 in symptom,t=22.70,P＜0.05;1.79±0.78 vs 0.19±0.31 in dye,Z=-6.40,P＜0.05),indicating the symptoms and dye results were obviously improved after therapy.In the control group,no significant differences were found in the symptom score and dye score in the corresponding time period (12.63±2.60 vs 12.94±2.11,t=-1.10,P＞0.05 in symptom;1.97±0.74 vs 1.98±0.72,Z=-0.58,P＞0.05 in dye).According to the grade of disease,the magnitude of the staining after treatment was considerably improved in comparison with before treatment (Z_1=-3.47 for mild,Z_2=-4.04 for moderate,Z_3=-3.74 for severe),showing statistically significant differences between them (P＜0.05).ConclusionThe use of artificial tears is an efficacious treatment for treating lid wiper epitheliopathy.The topicaly utilization of artificial tears can alleviate the symptoms and pathological changes of lid wiper epitheliopathy.

Taking Naegleria australiensis, a species of pathogenic free-living amoeba (isolated in Shanghai in 1986), as antigen, two cell lines which provided potentially permanent source of monoclonal antibodies were established by lymphocytic hybridoma technique. The results of identification showed that: (1) the two cell lines could secret two different kinds of McAbs; (2) both of the McAbs were IgG (by gel diffusion); (3) McAbs produced in BALB/c mice were at high concentrations. One of them had a titer of ≥1 : 8 192 and the other≥l : 1 024 (by enzyme linked immunosorbent assay). A decline of the titers after purification by salting-out method was shown. One of the purified McAbs had a titer of≥1: 2 024 and the other≥l : 128.We have adopted two ways of recovering cryopreserved cells : ordinary recovering and "direct" recovering. The latter way was more practical because it could reduce the cycle of antibody production, and avoid contamination and chromosome variation. Experiments with different doses of cells revealed that, if the latter way was used, the optimal dose was 3 to 5 ? 106 cells per mouse.

Background Dry eye is the most common ocular surface disease.Anterior segment pattern of optical coherent tomography (OCT) is able to be used to assess the tear meniscus directly and accurately.Objective This study was to evaluate the correlation between measuring outcomes of tear meniscus by anterior segment module of OCT with signs and symptoms of dry eye.Methods A retrospective serial cases-observational study was designed.Thirty-six patients who completed Ocular Surface Disease Index (OSDI) and got a score more than 20 were enrolled in the First Hospital of Peking University from September to October,2010 under the informed consent.The upper and lower tear meniscus height (U/LTMH,μm),depth (U/LTMD,μm) and cross sectional area (U/LMA,mm2) were measured with the anterior segment module of OCT (RTVue.pitch).A series of clinical tests were performed,including tear film interferometry,break-up time (BUT),fluorescein corneal staining,lissamine green conjunctival staining and Schirmer Ⅰ test (S Ⅰ t).The correlations of measuring outcomes of tear meniscus by anterior segment module of OCT with dry eye-related examinations were analyzed with Spearman correlation coefficients.Results The values of UTMH,UTMD,UMA were (232±56) μm,(156±53) μm,(0.021 ±0.008) mm2,respectively,and the values of LTMH,LTMD,LMA were (222 ± 72) μm,(163 ± 65) μm,(0.020 ± 0.006) mm2,respectively.No significant differences were found in the measuring values between the upper and the lower tear meniscus (all at P＞0.05).The quantitative values of tear meniscus were not significantly correlated with the OSDI scores or tear film interferometry grade.Significant correlations were seen between UTMH,UTMD,UMA and BUT (r=0.46,P=0.01 ;r=0.40,P=0.02;r=0.43,P=0.01).LTMH,LTMD,LMA were positively correlated with BUT (r=0.61,P=0.00;r=0.64,P=0.00;r=0.64,P=0.00) and S Ⅰ t (r=0.54,P=0.02 ;r=0.46,P=0.01;r=0.55,P=0.01) as well as negatively correlated with fluorescein cornealstaining (r=-0.37,P=0.04;r=-0.37,P=0.04;r=-0.41,P =0.05) and lissamine green conjunctival staining (r =-0.56,P =0.01 ; r =-0.37,P =0.04 ; r =-0.47,P =0.00).Conclusions Anterior segment module of OCT is an effective approach to the measurement of tear meniscus.The measuring outcomes of anterior segment of OCT are associated with dry eye-related signs.

Objective To improve the technology of operation room video transmission for remote view and exchange.Methods The integrated controllable environment,the core technology of digital video transmission and video-on-demand were applied in the system.Results The system was easy to set up and operate.It had a strong network adaptability.Conclusion A feasible interactive platform is built for surgery teaching,research,medical management in the hospital.

Objective To clarity the role of VEGF and its receptors in laryngeal squamous cell carcinoma development and metastasis. Methods The protein and mRNA expression of VEGF and its receptors (Fit-1 and KDR) were examined by Western-blotting and semiquantitative reverse transcriptase polymerase chain reaction analysis in laryngeal squamouse cell carcinoma (20 specimens) and the adjacent non-neoplastic laryngeal tissues (18 specimens). Results The protein and mRNA expression levels of VEGF and its receptors(Fit-1 and KDR) were more abundant in laryngeal squamous cell carcinoma than that in the adjacent non-neoplastic laryngeal tissues (ordedy 4.32±2.21, 2.00±0.91. 1.20±0.55, 0.29~0.31. 2.50±1.69, 0.85±0.28. P<0.01). The expression of VEGF and its receptors(Fit-1 and KDR) in laryngeal squamous cell carcinoma was significantly higher in lymph node positive group than that in lymph node negative group (P<0.01 or P<0.05). Positive correlation was observed between VEGF and KDR in the laryngeal squamouse cell carcinoma and adjacent non-neoplastic laryngeal tissues (P<0.01). There was no correlation between VEGF and Fit-1 expression(P>0.05). Conclusion The intense expression of VEGF, Fit-1 and KDR in laryngeal squamous cell carcinoma provides strong evidence linking VEGF, Fit-1 and KDR expression to the angiogenesis associated with laryngeal squamous cell carcinoma. The positive correlation between VEGF expression and KDR expression clearly demonstrates that KDR is the main signaling receptor for VEGF in laryngeal squamouse cell carcinoma. The VEGF/KDR system plays a functional role in the progression of laryngeal squamous cell carcinoma.

OBJECTIVE To investigate the expression and significance of Fas, FasL and FADD in laryngeal carcinoma. METHODS Immunohistochemical method was used to examine the expression of Fas, FasL and FADD in laryngeal carcinoma specimen and adjacent normal tissues. RESULTS The positive rates of Fas and FADD in laryngeal carcinoma tissue were significantly lower than that in adjacent normal tissue, while FasL in laryngeal carcinoma tissue was higher than that in adjacent normal tissue(P

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Objective To construct a programmed cell death ligand 1(PD-L1) co-expression network in lung squamous cell carcinoma,screen potential PD-L1 co-expression biomarkers,and try to find the genes and pathways participating in PD-L1-regulated tumor immune response.Methods The lung squamous cell carcinoma dataset extracted from TCGA was used to screen the co-expression genes of PD-L 1 at the whole-genome transcriptional level by Venny analysis,and the target genes were screened by multiple types of cluster and molecular network analysis to construct a PD-L1 co-expression network.Results A total of 126 genes moderately co-expressed with PD-L1 were retrieved,most of them are plasma membrane targeting genes participating in immune response.Three transcription factors (IRF2/NFKB1/IRF1) were involved in more than 30％ the regulation of the PD-L1 genes transcription.By screening the core molecules of co-expression of PD-L1 gene set and analyzing the connectivity of network node,6 network nodes genes with the highest connectivity were retrieved as follows:IFNG,JAK2,STAT1,CTLA4,CD80 and CCR5.Analysis of the relations of the different expression levels of these genes to the survival situation of patients with lung cancer revealed that CCR5 was a significant prognostic marker.Analysis of the PD-L1 expression and CCR5 gene spectrum data showed the Pearson correlation coefficient is 0.47(P＜0.05);GO-BP cluster analysis showed that the function of CCR5 mainly focused on immune regulation,T cell regulation and signal transduction,in accordance with the PD-L1 function of network regulation.Conclusions The main nodes of PD-L1 co-expressing gene set are immune-related molecules,among which IFNG/CCR5/NFKB1 play the most significant regulatory effects in the gene network.This finding lays a foundation for the research and immunotherapy for lung squamous cell carcinoma.

Objective To explore the insertion of the teaching contents of nursing in rural doctors'higher education,so as to increase their understanding of medical knowledge and improve their medical skills.Method 90 rural doctors of Grade 2014 were chosen as the research object,and according to their willingness to participate,they were divided into control group and observation group.The students in the control group were mainly taught by the relevant knowledge of clinical medicine,while nursing teaching content was inserted in the teaching of observation group.In the teaching process,firstly,the teaching contents of nursing were reorganized,and then the teaching content of clinical medicine was taken as the main line,according to the development of teaching content,flexibly inserting nursing teaching part.The results of the final examination of the internal medicine of the two groups were compared and the specific learning experience of rural doctors was investigated.SPSS 20.0 was used to analyze the data,the count data was expressed as percentage,and chi square test was performed.Results The number of students in the control group and the observation group whose subjective score was more than 40 was 17.65％ and 48.72％ respectively.The number of students scoring ＜30 points accounted for 23.53％ and 5.13％ of the total number of students,and there was a statistically significant difference between the two groups(P＜0.05).The observation group had a better learning experience,and had little influence on the learning of clinical medical knowledge.Conclusion In the stage of education for rural doctors,inserting the teaching contents of nursing can improve the teaching effect.