@@

@@

@@

Cancer stem cells are thought to be the seed of tumor formation, through complex signalings and cytokines in the surrounding microenvironment regulate the development and metastasis of tumor.Tumor stem cells have the characteristics of self-renewal and differentiation, the intracellular signaling pathways regulating self-renewal and differentiation of cancer stem cell include Wnt, Hedgehog signaling pathway.The tumor microenvironment is the dimensional environment surrounding the tumor,including the extracellular matrix, surrounding blood capillary,stromal cells ( fibroblasts, mesenchymal stem cells, tumor-associated endothelial cells, inflammatory cells) and cytokines secreted by stromal cells.Cancer stem cells maintain a close communication with the cells in the tumor microenvironment.In this paper, the cell surface maker of cancer stem cell,cancer stem cells and regulation of cytokine in the microenvironment,intracellular signaling pathways of cancer stem cells are reviewed to show complex regulatory networks in the tumor microenvironment.This review should help providing a new direction on specific cancer therapy for cancer stem cells in cacer treatment.

Objective To explore the risk factors affecting the quality of life (QOL) of patients with obstructive sleep apnea (OSAS) and the influence of nasal continual positive airway pressure (nCPAP) treatment on the QOL of OSAS patients. Methods Measuring the quality of life of 212 patients suffered from OSAS with WHOQOL-BREF and analyzing the influences of the sleepiness, quality of sleep, chronic disease and nCPAP treatment on the QOL of patients with OSAS. Results The scores on physical domain and psychological domain of patients who were sleepiness or had bad quality of sleep were less than that of patients who were non-sleepiness or had a good sleep respectively(P

0.05),excepting the significant differences in the non-elderly ( P

This study aimed at preparing the chemical reference substance of garcinol.A preparative high-speed countercurrent chromatography (HSCCC) was adopted for the isolation of garcinol from the twigs of Garcinia multifiora Champ,G.esculenta Y.H.Li and the fruits of G.xanthochymus Hook.f.ex T.Anders.The crude extracts were separated by HSCCC with two phase solvent systems composed of n-hexane-ethyl acetate-95％ ethanol-water (8∶8∶12∶4,volume ratio) using the upper stationary phase and the lower mobile phase.Under the conditions of a flow rate of 2.0 and 4.0 mL· min-1,and the apparatus rotation at 850 rpm,the column temperature at 25℃ and the detection wavelength at 254 nm,the fraction containing garcinol was purified by the Sephadex LH20 chromatography.The purity test in the extracts was determined by high-performance liquid chromatography.As a result,the contents of garcinol were 45,281 and 4080mg respectively separated from 104.765 g twigs of G.multiflora Champ,105.270 g G.esculenta Y.H.Li and 102.318 g the fruits of G.xanthochymus Hook.f.ex T.with the purity of 98.72％,98.36％ and 98.42％.Compared with the sample pretreatments and separation efficiency of the three plants,it was found that the fat-soluble extracts rapidly and efficiently extracted using n-hexane-ethyl acetate-95％ ethanol-water (5∶5∶5∶5,volume ratio) contained abundant garcinol taking fruits of G.xanthochymus Hook.f.ex T as the raw material with the combination of HSCCC and Sephadex LH-20 chromatography.In conclusion,it was indicated that the combination method is efficient with high operability and large preparation quantity.

Objective To obtain two types of optical isomers from 1-(Benzamidomethyl)-1,2,3,4-tetrahydro-isoquinoline (BTIQ). Methods ( ±) BTIQ as raw materials , optically pure camphor sulfonic acid as resolution agent was used and repeated resolution in acetone , And the resolution product was detected by specific optical rotation .The product of BTIQ was hydrolyzed , and the ratio of ATIQ was compared with that of the literature .ResuIts After two repeated chemical resolutions , the specific rotations of both enantiomers are no longer changed .It was showed that the products of higher optical purity.The specific rotation of both isomers are -35.65°(CH2Cl2, C=0.5)with the yield of 27.52%,and +35.17°(CH2Cl2, C =0.5) with the yield of 31.55% respectively.The specific rotation value of chiral 1,2,3,4-tetrahydroisoquino line ( ATIQ) which was the hydrolysis product of BTIQ consistent with values reported in the literature .ConcIusion The (-) BTIQ and ( +) BTIQ enantiomers were successfully obtained by the method of resolution , and the yield and optical purity of the obtained products are higher , laying the foundation for the further development of high efficiency , low toxicity of chiral schistosomicide ( praziquantel ) and other containing tetrahydroisoquinoline structure of chiral drugs .

Objective To investigate the prevalence rate and related factors of excessive daytime sleepiness (EDS) in the elderly. Methods Epworth Sleep Scales (ESS) was used to make a randomized questionnaire among the retired elderly. Results 1 000 questionnaires were released and totally 768 qualified answers were returned. The mean score of ESS was 4.22?0.10 and the score ≥8 was used as an abmormal value. The prevlence rate of EDS in the elderly group was 10.9%. Regression analysis was done based on ESS score as dependent variable, and age, sex, duration of sleep, difficulty in falling asleep, early wakeup, daytime sleepiness, habitual snoring and loud unstable snoring as independent variables. It was showed that daytime tiredness(r=1.458, P

Objective: To study the dietary habits and serum leptin levels of obese children and its possible association to lipids and glucose metabolism, serum lipids and C peptide (CP) in children with different body weight. Methods: 52 obese children were inquired about their favorite foods and food intake. 145 healthy children (85 boys, 60 girls), aged 6-13, with a wide range of body mass index (BMI) 14 to 30 kg/m 2, were measured for fasting serum leptin, CP, glucose, lipids (TG, TC, LDL C,HDL C), height and weight. The children were classified into three groups by BMI, i.e. normal weight group (A group), overweight and slight obese group (B group). moderate and severe obese group (C group). Results: 65% of obese children liked meat best. 38.46% of them ate most in supper. The serum leptin, CP, TG in obese children were higher than that in normal children. Leptin concentration of girls were higher than that in boys in A and B groups (P