Parkinson’s disease is resulted from the progressive degeneration and from the loss of dopaminergic neurons in Substantia Nigra. Current researches focuson the optimum conditions in vivo and in vitro associating the differentiation as well as survival of dopaminergic neurons,in order to get sufficient dopaminergic neurons for cell-replacement therapy in Parkinson’s disease. This paper reviewed influential factors of neural stem cells differentiate into dopaminergic neurons in vivo and in vitro.

Objective To explore the clinical curative effect of immunopotentiator combined with antiviral therapy in the treatment of children with recurrent respiratory tract infections.Methods 56 children with recurrent respiratory tract infections were selected as study subjects,and they were divided into two groups according to different therapeutic methods,28 cases in each group.The control group was given conventional antiviral treatment,the observation group was treated with immunopotentiator combined with antiviral therapy.The serum levels of IgA,IgG,IgM and peripheral blood T cell subsets CD3+,CD4+,CD8+ levels were detected in the two groups before treatment and after treatment.The fading away of the main symptoms and signs,and the clinical efficacy were observed.Results The fever subsided time [(1.98 ± 0.64) d],cough fade time [(1.65 ± 0.47) d] and lung's fading time [(2.38 ± 0.57) d] of the observation group were significantly shorter than those of the control group(all P ＜ 0.05).The total effective rate of the observation group was 92.86％,which was obviously higher than 67.86％ of control group(x2 =5.54,P ＜ 0.05).The serum immunoglobulin IgG [(9.09 ± 3.01) g/L],IgA [(1.75 ± 0.57) g/L],IgM [(1.39 ± 0.42) g/L] of the observation group after treatment had statistically significant differences compared with the control group (t =0.038,0.041,0.027,all P ＜0.05).The T lymphocyte subsets CD~ [(59.4 ± 8.9) ％],CD4+ [(40.5 ±4.4)％],CD8+ [(29.8 ± 4.7) ％] of the observation group after treatment had statistically significant differences compared with the control group (t =0.044,0.039,0.037,all P ＜ 0.05).Conclusion The application of immunopotentiator combined with antiviral therapy in the treatment of children with recurrent respiratory tract infections had exactly clinical curative effect,and it is worthy of popularization and application.

Objective To study the correlation between the occurrence of encephaledema and the target dose-volume after the low dose stereotactic radiosurgery of epilepsy.Methods Totally 136 epilepsy patients treated by low dose stereotactic radiosurgery with Novalis System were analysed retrospectively.The target doses and volumes of the patients were analysed by drawing out the scatterplot and conducting the binary Logistic regression to all of the data.An equation was obtained to predict the occurrence of radiation induced encephaledema in certain range of target volume and dose.Results Among all of 136 patients,different degree of local encephaledema occurred in 19 cases after the radiosurgery.Higher occurrence of radiation induced encephaledema was observed when the target central dose (i.e.90％ isodose circling the target)was more than 18 Gy or the target volume more than 30 cm3.Moreover,in patients with multitargets the doses of different targets devoted to each other,which could lead to the occurrence of local encephaledema.The equation to predict the occurrence probability was obtained by regression analysis.By testing this equation in all of 136 patients the coincidence percentage was 94.7％.Conclusions The target dose and volume could be effective parameters in certain range to predict the occurrence probability of radiation induced encephaledema.This equation would help to establish and optimize the therapeutic planning system.So it could finally reduce the side-effect of low dose stereotactic radiosurgey in epilepsy patients.The equation has some clinical value.

Parkinson's disease(PD) is a kind of degenerative disease caused by both genetic and environ-mental factors. Concerning these two factors, various animal models for parkinson's disease were made for the study. Transgenic animal models were made by the method of microinjection, electronic perforation, particle bom-bardment, virus vector transfection and so on, which can express exogenous target gene. These models imitated the process of Parkinson's desease induced by virulence gene and provided a powerful tool for investigation on e-tiopathogenesis, gene therapy and medical intervention. In this article, we reviewed the progress of genetic models associated with PD and theirs contribution to PD research.

Objective To develop stable cultures of human umbilical cord vascular endothelial cells(ECs)and smooth muscle cells(SMCs)in order to investigate the effect of mycophenolic acid(MPA)on proliferation and collagen Ⅰ production of SMCs.Methods From Sep.2002 to Sep.2003,ECs were cultured from human umbilical cord veins,and SMCs from arteries.Productions of endothelial cells conditioned medium(ECCM)was obtained from serum free Dulbecco's modified eagle medium(DMEM)with or without MPA(0,0.31,1.25,2.50,5.00,10.00 ?g?mL -1).Proliferation of SMCs was performed with 3H-thymidine incorporation scintillation,and collagen Ⅰ production of SMCs was measured with enzyme-linked immunosorbent assay.Results (1)The 3H-thymidine incorporation increased significantly(P

OBJECTIVE This study is to investigate the effects on nasopharyngeal carcinoma cell lines(CNE-2Z)induced by As2O3 and its possible mechanisms.METHODS CNE-2Z cells were treated with various concentrations of As2O3 for different times.The IC50 values were detected by trypan blue stain assay to choose the optimal concentration of As2O3.Cell cycle redistribution was analyzed by flow cytometry.The expression levels of p16、 RASSF1A、DNMT 3B mRNA were assessed by RT-PCR.RESULTS The suppression of cell proliferation by As2O3 was time and dose-dependent.After being treated with different concentration of As2O3,the IC50 values of As2O3 were(1.50?0.05),(1.09?0.13),(0.65?0.04)?mol/L at 24,48,and 72h,respectively.As2O3 also arrested CNE-2Z cells in G2/M phase of cell cycle.After CNE-2Z cells being treated with As2O3,the expression of RASSF1A mRNA were up-regulated(P

Objective To study HPLC fingerprints of Radix Glycyrrhizae from different habitats, develop the method of hierarchical cluster analysis by using the results of fingerprints, and discuss regional effect on accumulation of active ingredients of Radix Glycyrrhizae. Methods HPLC Fingerprint analysis method of active ingredients was developed and the method had been evaluated. Based on the standardized result of peak area of glycyrrhizin, liquiritin, liquiritigenin, isoliquiritin, and isoliquiritigenin, seventeen batches of Radix Glycyrrhizae were classified and identified using hierarchical cluster analysis. Results The methodological evaluation showed that this method had a good repeatability. The amounts of glycyrrhizin and flavones in Radix Glycyrrhizae from various habitats are different. Conclusion Accumulation of active ingredients of Radix Glycyrrhizae has some relativity with habitats.

Objective To develop a HPLC fingerprints of Glycyrrhiza uralensis Fisch.in Inner Mongolia.Methods The RP-HPLC method was adopted on Phenomenex C18(4.6?250 mm,5 ?m)analytical column by gradient elution with acetonitrile and acetic acid buffer solution as mobile phase.The gradient wavelength data acquisition was employed.The analysis time was 60 minutes and the flow rate was 1 mL/min.Results The HPLC standard fingerprints chromatography of Glycyrrhiza uralensis Fisch.consists of 10 common characteristic peaks.The results of method validation accorded with the technical standard of fingerprints.Conclusion This method is stable,accurate,reliable,and can provide a scientific basis for the quality control of Glycyrrhiza uralensis Fisch..

Objective: In order to detect the effect of bcl-xs on camptothecin-induced apoptosis in human nasopharyngeal carcinoma CNE-2Z cells in vitro.Methods:bcl-xs gene-bearing mammalian expression vector(pcDNA3xs)was transfected into CNE-2Z cells using LipofectAmine.The expression of bcl-xs was determined with western blot.Cells which were transfected with native pcDNA3 vector were used as control.Apoptotic cells were detected with flow cytometry after exposure to camptothecin for 24h.Results:Cell clone(CNE-2Zxs)with stable expression of bcl-xs was obtained as confirmed with western blot.Results from flow cytometry analysis showed a significant increase of apoptotic cells in CNE-2Zxs as compared with CNE-2Zneo after treatment with the same dose of camptothecin.Conclusion:Exogenous bcl-xs expression sensitized nasopharyngeal carcinoma CNE-2Z cells to camptothecin-induced apoptosis.

OBJECTIVE To explore the relationship between allergic rhinitis and IFN-?, IL-12. METHODS The expression of IL-12 was detected by in situ hybridization and enzyme-linked immunosorbent assay in 37 patients with allergic rhinitis and 12 control samples. IFN-? was detected by ELISA. RESULTS The positive ratios of IL-12 in PBMC were 0.13?0.03 and 0.77?0.15 in allergic rhinitis group and control group respectively. The concentrations of IL-12 were (13.7?2.4 ) pg/L and (52.9?8.4 ) pg/L in allergic rhinitis group and control group respectively. The concentrations of IFN-? were (11.2?2.1 ) pg/L and (51.8 ?6.4) pg/L in allergic rhinitis group and control group respectively. CONCLUSION The down-regulation of IL-12 and IFN-? was related to allergic rhinitis, and hyper-function of Th2 cells may play an important role in the pathogenesis of allergic rhinitis.