Study on mechanism of down-regulation of SLP-2 gene expression on proliferation and apoptosis of glioma cells / 中国免疫学杂志

Objective:To investigate the effect of downregulation of SLP-2 gene expression on proliferation and apoptosis of brain glioma cells.Methods:The targeting siRNA sequence of SLP-2 transfected U251 human glioma cells,blank group (without any cell treatment)and negative control group (cell transfected nonsense siRNA sequence)were set,Western blot was used to detect the expression of SLP-2,Bcl-2,Bax,Notch1,Hes1 protein after transfected 48 h;cell proliferation was detected by CCKg;cell apoptosis was detected by flow cytometry.Results:The protein expression of SLP-2 in negative control group had no significant difference with the control group (P＞0.05),and the expression of SLP-2 protein in SLP-2 knock down group was significantly lower than control group (P＜0.05);cell survival rate,apoptosis rate,mRNA expression of IL-6,TNF-α and Bcl-2,Bax,Notch1,Hes1 protein expression in the negative control group and the blank group had no significant difference (P＞0.05),cell survival rate,mRNA expression of IL-6 and TNF-α and the expression of Bcl-2,Notch1,Hes1 protein in SLP-2 knock down group was significantly lower than control group,the apoptosis rate and the expression of Bax protein was significantly higher than control group (P＞0.05).Conclusion:Downregulation of SLP-2 gene expression can significantly inhibit the proliferation and induce apoptosis of glioma cells,down regulate the expression of inflammatory cytokines IL-6 and TNF-α,and the mechanism is related to the inhibition of Notch1 signaling pathway.

Chemical constituents from Pteris multifida and cytotoxic activity / 中国中药杂志

The materials were extracted by 95% ethanol, and the extracting solution was isolated by kinds of chromatographic columns including polyamide, MCI, preparative MPLC, and preparative HPLC. Eight diterpenes and two sesquiterpenes were isolated from the plant. On analysis of ESI-MS and NMR spectroscopic data, the structures were established as ent-3β-hydroxy-kaur-16-en-19-al (1), 4-epi-kaurenic acid (2), mitrekaurenone (3), 7β,16α,17-trihydroxy-ent-kauran-19-oic acid (4), crotonkinin E (5), crotonkinin F (6), pterisolic acid A (7), pterisolic acid C (8), (2R)-pterosin P (9), and dehydropterosin B (10). Compounds 1-6 were obtained from Pteris for the first time, and compounds 7-10 were obtained from P. ensiformis for the first time. Compounds 5-8 showed moderate activity against HCT-116, HepG2 and BGC-823 cell lines, separately.

Bioactive lignans from Silybum marianum / 中国中药杂志

The seeds of Silybum marianum were extracted by hot water, and the extract was isolated by D101 macroporous resin, MCI resin, MPLC, HPLC, et al. As a result, 7 compounds including tricin 4'-O-[threo-β-guaiacyl-(7″-O-methyl)-glyceryl] ether(1), tricin 4'-O-[erythro-β-guaiacyl-(7″-O-methyl)-glyceryl] ether(2), 5'-methoxyhydnocarpin-D(3),palstatin(4),(8R,7'S,8'R)-5,5'-dimethoxy-7-oxolariciresinol 9'-O-D-xylopyranoside(5), 9-O-D-glucopyranoside(6), and(-)-haplomyrtoside(7) were isolated and identified for the first time. Compounds 1, 3, 4, and 5 exhibited activity against influenza A(H5N1)with IC₅₀ value of 0.65, 0.21, 0.32, and 0.56 μmol•L⁻¹, respectively. Compounds 1, 2, 6, and 7 exhibited cytotoxity against HepG-2 with IC₅₀ value of 0.35, 0.25, 0.53, 0.66 μmol•L⁻¹, respectively.

Bioactive quinolizidine alkaloids from Sophora tonkinensis / 中国中药杂志

Twelve quinolizidine alkaloids were isolated from Sophora tonkinensis by means of silica gel, preparative MPLC, and preparative HPLC. On analysis of NMR spectroscopic data, their structures were established as 3-(4-hydroxyphenyl)-4-(3-methoxy-4-hydroxyphenyl)-3,4-dehydroquinolizidine(1), lanatine A(2), cermizines C(3), senepodines G(4), senepodines H(5), jussiaeiines A(6), jussiaeiines B(7),(+)-5α-hydroxyoxysophocarpine(8),(-)-12β-hydroxyoxysophocarpine(9),(-)-clathrotropine(10),(-)-cytisine(11), and (-)-N-methylcytisine(12), respectively. Compounds 1-7 were first isolated from Sophora L. plant. In the in vitro assays,the isolated compounds 1, 3, 6-10 exhibited potent activity against CVB3 with IC₅₀ of 6.40, 3.25, 4.66, 3.21, 0.12, 0.23 and 1.60, and with selective index values(SI=TC₅₀/IC₅₀)of 12.0, 5.6, 13.0, 15.1, 50.1, 26.2, and 23.6, respectively. Compounds 1, 3, and 7 exhibited activity against staphylococcus aureus(ATCC 29213)with MICvalues of 8.0, 3.5, 6.0 g•L⁻¹, respectively. Compounds 1, 3, 7, and 12 exhibited activity against staphylococcus aureus(ATCC 33591)with MIC values of 18.0, 7.5, 8.0, 12.0 g•L⁻¹, respectively. Compounds 2, 6, 7 exhibited activity against Escherichia coli(ATCC 25922) with MIC values of 1.0, 3.2, 0.8 g•L⁻¹.

Study on cancer incidence through the Cancer Registry Program in 11 Cities and Counties, China / 中华流行病学杂志

Objective Aim of this paper was to explore the trend and characteristics of cancer incidence in 11 areas (5 cities and 6 counties) in China. Methods Data from cancer registries during 1988 to 2002 collected from the 11 cancer registry points were used to analyze the trends and characteristics of cancer incidence rates. Results There were 695 050 newly developed cancer cases in this study. The crude rate of incidence and the world age-adjusted incidence were 215.50/105 and 170.97/105 respectively. The leading cancer sites were lung, stomach, liver, esophagus, breast, colon, rectum, pancreas, bladder and leukemia. The sixteen key cancers accounted for 85.56% of all the cancer cases. The crude incidence rate of all cancers had been significantly increased from 1988 to 2002. Among them, prostate (185.48%) ranked the fastest growing one followed by cancers of the gallbladder, breast, colon, ovarian, lymphoma, bladder, pancreas, rectum, lung, leukemia and liver. The one that had reduced the most was cervix uteri (17.00%), followed by esophagus, stomach and nasopharynx. Conclusion Crude cancer incidence rate increased in the 11 areas in China from 1988 to 2002. The ranking of pancreas cancer, bladder cancer and leukemia came into the top ten. Even though the incidence rates of prostate and gallbladder cancer were relative low but had a fast increase. The results of this study provided a scientific base for the development of a better strategy on cancer prevention and control in China.