lncRNA 00707通过miR-613调控胃癌MGC-803、SGC-7901细胞的恶性生物学行为

目的:探讨长链非编码RNA 00707(lncRNA 00707)和微小RNA-613(miR-613)对胃癌细胞增殖和转移的调控作用及其相关机制。方法:收集2014年1月至2018年6月青海省人民医院肿瘤外科89例原发性胃癌组织及癌旁组织标本以及胃癌MGC-803、SGC-790、BGC-823细胞,采用qPCR实验检测胃癌组织和细胞系中lncRNA 00707、miR-613的表达水平。分别建立lncRNA 00707低表达和过表达细胞模型,采用CCK-8实验检测MGC-803、SGC-7901细胞增殖能力,Transwell法检测MGC-803、SGC-7901细胞迁移和侵袭能力。用双荧光素酶基因报告实验验证lncRNA 00707与miR-613的靶向关系。结果:与癌旁组织相比,胃癌组织中lncRNA 00707呈明显高表达(P<0.01),lncRNA 00707表达水平与WHO分期呈正相关(P<0.05);与正常细胞系GES-1相比,胃癌细胞系中lncRNA 00707表达明显上调(P<0.05)。敲低lncRNA 00707可明显抑制SGC-7901细胞的增殖、侵袭和迁移能力(均P<0.05);lncRNA 00707过表达可明显提高MGC-803细胞的增殖和迁移能力(P<0.05)。与阴性对照组相比,lncRNA00707过表达显著降低了miR-613荧光素酶报告载体的荧光素酶活性,而下调MGC-803和SCG-7901细胞中lncRNA 00707,miR-613的表达显著增加(均P<0.01)。结论:lncRNA 00707在胃癌组织和细胞系中发挥促癌效应,其可以通过抑制miR-613而促进胃癌MGC-803和SCG-7901细胞的增殖和转移。

Growth inhibitory effect of 4-phenyl butyric acid on human gastric cancer cells is associated with cell cycle arrest

AIM: To investigate the growth effects of 4-phenyl butyric acid (PBA) on human gastric carcinoma cells and their mechanisms. METHODS: Moderately-differentiated human gastric carcinoma SGC-7901 and lowly-differentiated MGC-803 cells were treated with 5, 10, 20, 40, and 60 μmol/L PBA for 1-4 d. Cell proliferation was detected using the MTT colorimetric assay. Cell cycle distributions were examined using flow cytometry.RESULTS: The proliferation of gastric carcinoma cells was inhibited by PBA in a doseand time-dependent fashion. Flow cytometry showed that SGC-7901 cells treated with low concentrations of PBA were arrested at the G0/G1 phase, whereas cells treated with high concentrations of PBA were arrested at the G2/M phase. Although MGC-803 cells treated with low concentrations of PBA were also arrested at the G0/G1 phase, cells treated with high concentrations of PBA were arrested at the S phase. CONCLUSION: The growth inhibitory effect of PBA on gastric cancer cells is associated with alteration of the cell cycle. For moderately-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and G2/M phases. For lowly-differentiated gastric cancer cells, the cell cycle was arrested at the G0/G1 and S phases.

Effects of compound YSY-01A, a novel proteasome inhibitor, on MGC-803 cells and its related mechanism

As a novel proteasome inhibitor, remarkable proliferation inhibitory effect of compound YSY-01A was shown on tumor cells in previous studies. However, few studies has reported its effect on gastric cancer and related mechanism. We evaluated the anti-proliferative effect of compound YSY-01A using MGC-803 cells and its anti-tumor effect using xenograft nu-BALB/c mouse model. Cell proliferation inhibition was assessed by SRB assay. Related protein expression levels were determined by Western blot assay. We observed that the compound YSY-01A had a significant proliferation inhibitory effect on MGC-803 cells in vitro. Experiment in vivo showed that the compound YSY-01A had a remarkable growth inhibitory effect on MGC-803 cells xenograft tumor when it was used either alone or in combination with the conventional chemotherapeutic agent 5-fluorouracil （5-FU）. Furthermore, YSY-01A and 5-FU had a synergistic effect on xenograft tumor. Results of molecular experiment showed that the compound YSY-01A had a remarkable inhibitory effect on TNF-c~ and IFN induced NF-KB nuclear translocation. At the same time, the compound YSY-01A could reduce the expression of IKK-~, IL-I~ and iNOS, while it significantly enhanced the expression of COX-2 in MGC-803 ceils. Taken together, compound YSY-01A had an impressive tumor inhibitory effect, and it worked in NF-KB-related pathway, suggesting that the compound YSY-01A was an effective therapeutic drug for patients with gastric cancer. Higher tumor cell growth inhibition after the treatment in a combination with 5-FU indicated that combining YSY-01A with 5-FU might be more effective for displaying tumor cell growth inhibitory effects on gastric cancer cells.

Nortriterpenoids from the fruit stalk of Schisandra chinensis (Turcz.) Baill.

Objective:The fruit stalk of Schisandra chinensis(Turcz.)Baill.(S.chinensis)has been found to contain bioactive components similar to the fruit of S.chinensis.Here,we report a recent discovery about new nortriterpenoids with a novel skeleton and anti-gastric cancer activity,which were isolated from the fruit stalk of S.chinensis.Methods:The chemical components of ethyl acetate extract from 70%ethanol extract from S.chinensis fruit stalk were separated,purified,and identified by liquid chromatography methods(silica gel,ODS,HPLC)and extensive spectroscopic analyses(NMR,IR,UV,MS,CD).Results:Two new nortriterpenoids,schilancitrilactone M and 25-hydroxyl schindilactone D(1 and 2),along with ten known nortriterpenoids(3-12)were isolated from the fruit stalk of S.chinensis.The isolated compounds were tested for their cytotoxic activities against MGC-803 cells,and the results showed that compounds 6-8 possessed significant activities with IC50 of 9.01,11.77,and 2.74μmol/L,respectively.Conclusion:Twelve nortriterpenoids including two new compounds were isolated from the fruit stalk of S.chinensis for the first time.Among them,compounds 6-8 showed significant anti-gastric cancer activities.We postulated that the fruit stalk of S.chinensis could be used as an anti-gastric cancer drug.

Synthesis,characterization and photodynamic activity of ethanolamino-substituted hypocrellin B(EAHB2)

The limitations of currently used clinical phototherapeutic agent, Photofrin, have prompted a search for more ideal photodynamic sensitizer. The hypocrellins, have been paid the