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Ran Ao, Lin Guan, Ying Wang, Jia-Ni Wang
This study explores the effect of COL1A2, COL6A3, and THBS2 gene silencing on proliferation, migration, invasion, and apoptosis of gastric cancer cells through the PI3K-Akt signaling pathway. The gastric cancer microarray expression data (GSE19826, GSE79973, and GSE65801) was analyzed. Gastric cancer tissues and corresponding adjacent normal tissues were extracted from patients. Positive expression rate of PI3K, Akt, and p-Akt was measured with immunohistochemistry. Two cell lines, BGC-823 and SGC-7901, were transfected and cells were grouped into blank, negative control, COL1A2-shRNA, COL6A3-shRNA, and THBS2-shRNA groups...
November 16, 2017: Journal of Cellular Biochemistry
Runfang Li, Jianmin Yu, Chengjun Wang
PURPOSE: To investigate the effects of silibinin, a natural compound, on the proliferation and apoptosis of BGC-823 gastric cancer cell line and to figure out the relevant pathways. METHODS: BGC-823 gastric cancer cells were treated with silibinin at various concentrations (0,25,50,100,150 and 200μM). Zero μM was the control group and the other concentrations were defined as the experimental groups. The effects of silibinin on the proliferation of BGC-823 gastric cancer cells were explored through methylthiazolyldiphenyltetrazolium bromide (MTT)...
September 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
Lisheng Cai, Qiuxian Chen, Shunyong Fang, Mingqiao Lian, Mingzhi Cai
OBJECTIVE: Altered expression of microRNA (miRNA) is strongly implicated in gastric cancer (GC). Here, we demonstrated a decreased expression of miRNA-329 in GC. Then we explored the regulatory mechanisms responsible for its effect on GC cells. METHODS: GC tissues and their adjacent non-tumor tissues were collected. Complete follow-up was updated. A series of inhibitors, mimics, and siRNA against KDM1A were introduced to validate regulatory mechanisms for miR-497 and KDM1A in BGC-823 cells...
November 11, 2017: Journal of Cellular Biochemistry
Weihui Yuan, Junhui Guo, Xude Wang, Guangyue Su, Yuqing Zhao
As active components of ginseng, 25-methoxylprotopanaxadiol and 25-hydroxyprotopanaxadiol exhibited an ability to inhibit the growth and proliferation or to induce the differentiation and apoptosis of tumour cells. We modified 25-OCH3-PPD and 25-OH-PPD with non-protein amino acids and a series of derivatives was obtained by chromatographic separation, purification and spectroscopy analysis. Thirteen derivatives of 25-OCH3-PPD (compounds 1-13) and 12 derivatives of 25-OH-PPD (compounds 14-25) were synthesised...
November 9, 2017: Steroids
Changfu Wang, Ping Xin, Youzhi Wang, Xuegang Zhou, Donghua Wei, Chengjie Deng, Shiqin Sun
Seven new compounds were isolated from the aerial part of Hedyotis diffusa, including three iridoid glycosides, hedyoiridoidside A - C (1-3), two cerebrosides, hedyocerenoside F (4) and G (5), and two new ceramides, hedyoceramide A (6) and B (7). And six known iridoid glycosides (8-13) were also obtained. Their structures were established by their physico-chemical constants and spectroscopic analysis. The cytotoxicity of all compounds against tumor cell lines of human cervical cancer HeLa, human leukemia HL-60, human lung cancer A459, human hepatoma HepG2, human gastric gland carcinoma BCG-823, human nasopharyngeal cancer CNE-2, human colon cancer HCT15, and human prostate cancer PC-3 were also evaluated in vitro...
November 6, 2017: Fitoterapia
Navid Adnani, Marc Chevrette, Srikar N Adibhatla, Fan Zhang, Qing Yu, Doug R Braun, Justin Nelson, Scott W Simpkins, Bradon R McDonald, Chad L Myers, Jeff S Piotrowski, Christopher J Thompson, Cameron R Currie, Lingjun Li, Scott R Rajski, Tim S Bugni
Advances in genomics and metabolomics have made clear in recent years that microbial biosynthetic capacities on Earth far exceed previous expectations. This is attributable, in part, to the realization that most microbial natural product (NP) producers harbor biosynthetic machineries not readily amenable to classical laboratory fermentation conditions. Such "cryptic" or dormant biosynthetic gene clusters (BGCs) encode for a vast assortment of potentially new antibiotics and, as such, have become extremely attractive targets for activation under controlled laboratory conditions...
November 9, 2017: ACS Chemical Biology
Xiang Gao, Jingping Sun, Chunyu Huang, Xiaohua Hu, Ning Jiang, Chenqi Lu
NADPH oxidase 4 (NOX4) is a member of the NADPH oxidase (NOX) family of enzymes and has been found abnormally expressed in human cancers. However, its role in gastric cancer (GC) is still unclear. In the current study, we reported that NOX4 expression levels were significantly up-regulated in GC tissues compared to normal tissues (P<0.0001). Higher NOX4 expression was significantly associated with poorer overall survival in GC patients. Silencing NOX4 in two NOX4 high expression GC cell lines, MGC-803 and BGC-823 cells, did not affect cell proliferation, while inhibited cell adhesion and cell invasion of GC cells...
2017: American Journal of Translational Research
Jie Liu, Lanyu Liu, Jin-Xiang Wan, Ying Song
Recent studies have indicated that long non-coding RNAs (lncRNAs) play important regulatory roles in tumor development and progression. However, the contribution of small nucleolar RNA host gene 20 (SNHG20) to gastric cancer development remains largely unknown. The aim of the study is to investigate the functional significance of SNHG20 involved in gastric cancer (GC) progression. In the study, our results demonstrated that the expression levels of SNHG20 were remarkably up-regulated in GC cells. Functionally, SNHG20 promoted the GC MKN45 and BGC-823 cells proliferation and invasion...
October 6, 2017: Oncotarget
Kai Blin, Hyun Uk Kim, Marnix H Medema, Tilmann Weber
Many drugs are derived from small molecules produced by microorganisms and plants, so-called natural products. Natural products have diverse chemical structures, but the biosynthetic pathways producing those compounds are often organized as biosynthetic gene clusters (BGCs) and follow a highly conserved biosynthetic logic. This allows for the identification of core biosynthetic enzymes using genome mining strategies that are based on the sequence similarity of the involved enzymes/genes. However, mining for a variety of BGCs quickly approaches a complexity level where manual analyses are no longer possible and require the use of automated genome mining pipelines, such as the antiSMASH software...
November 3, 2017: Briefings in Bioinformatics
Rui-Xue Yu, Rui-Tao Yu, Zhong Liu
Fucoxanthin is a natural carotenoid that had never been previously demonstrated to have anti-tumor effect on human gastric adenocarcinoma SGC-7901 or BGC-823 cells. Here it was found to inhibit proliferation and induce apoptosis through JAK/STAT signal pathway in these cells; the mechanism by which this occurred was investigated. We find that fucoxanthin significantly increased the number of apoptotic cells by propidium iodide (PI) dye staining and flow cytometry. Fucoxanthin (50 or 75 μM) induced SGC-7901 cells cycle arrest at S phase, while BGC-823 cells arrest at G2/M phase...
November 6, 2017: Human Cell
Lihua Li, Xiaojie Wang, Wei Li, Libo Yang, Rui Liu, Rong Zeng, Yunhua Wu, Tao Shou
miR-21 is an abundantly expressed miRNA in mammalian cells, and evolutionarily conserved across a wide range of vertebrate species. The previous study found that miR-21 is significantly upregulated in gastric cancer. However, the detail mechanisms remain to be largely unknown. In current study, quantitative real-time PCR was applied to examine the expression of miR-21 in gastric cancer tissue and cell lines. The roles of miR-21 in cell proliferation and cell cycle were analyzed by cck8 cell viability assays, flow cytometry cell cycle assays and clone formation assays...
October 31, 2017: Biochemical and Biophysical Research Communications
Tansy Chia, Nikolai M Adamski, Benedetta Saccomanno, Andy Greenland, Alastair Nash, Cristobal Uauy, Kay Trafford
Our previous genetic analysis of a tetraploid wild wheat species, Aegilops peregrina, predicted that a single gene per haploid genome, Bgc-1, controls B-type starch granule content in the grain. To test whether bread wheat (Triticum aestivum L.) has orthologous Bgc-1 loci, we screened a population of γ-irradiated bread wheat cv. Paragon for deletions of the group 4 chromosomes spanning Bgc-1. Suitable deletions, each encompassing ~600-700 genes, were discovered for chromosomes 4A and 4D. These two deletions are predicted to have 240 homoeologous genes in common...
November 1, 2017: Journal of Experimental Botany
Ya-Mei Wang, Meng-Li Gu, Fan-Sheng Meng, Wen-Rui Jiao, Xin-Xin Zhou, Hang-Ping Yao, Feng Ji
The histone acetyltransferases (HATs) adenovirus E1A-associated protein (p300) and CREB binding protein (CBP) serve as coactivators during a diverse assortment of cellular processes. In the present study, p300 and CBP were highly expressed in 5 gastric cancer (GC) cell lines (SGC‑7901, MKN45, MGC-803, BGC-823 and KATO III) compared with human normal gastric epithelial cell line (GES-1). C646, a selective inhibitor of p300 and CBP, inhibited cell viability and cell cycle and promoted cell apoptosis in all 5 GC cell lines...
October 23, 2017: International Journal of Oncology
Yunchang Xie, Junying Ma, Xiangjing Qin, Qinglian Li, Jianhua Ju
BACKGROUND: Griseoviridin (GV) and viridogrisein (VG, also referred as etamycin), both biosynthesized by a distinct 105 kb biosynthetic gene cluster (BGC) in Streptomyces griseoviridis NRRL 2427, are a pair of synergistic streptogramin antibiotics and very important in treating infections of many multi-drug resistant microorganisms. Three transporter genes, sgvT1-T3 have been discovered within the 105 kb GV/VG BGC, but the function of these efflux transporters have not been identified...
October 25, 2017: Microbial Cell Factories
Jiali Meng, Rongrong Feng, Guosong Zheng, Mei Ge, Yvonne Mast, Wolfgang Wohlleben, Jufang Gao, Weihong Jiang, Yinhua Lu
Pristinamycin, produced by Streptomyces pristinaespiralis, which is a streptogramin-like antibiotic consisting of two chemically unrelated components: pristinamycin I (PI) and pristinamycin II (PII), shows potent activity against many antibiotic-resistant pathogens. However, so far pristinamycin production titers are still quite low, particularly those of PI. In this study, we constructed a PI single component producing strain by deleting the PII biosynthetic genes (snaE1 and snaE2). Then, two metabolic engineering approaches, including deletion of the repressor gene papR3 and chromosomal integration of an extra copy of the PI biosynthetic gene cluster (BGC), were employed to improve PI production...
June 2017: Synthetic and Systems Biotechnology
Yihan Wu, Mohammad R Seyedsayamdost
Microbial natural products are genetically encoded by dedicated biosynthetic gene clusters (BGCs). A given BGC usually produces a family of related compounds that share a core but contain variable substituents. Though common, the reasons underlying this divergent biosynthesis are in general unknown. Herein, we have addressed this issue using the hydroxyalkylquinoline (HAQ) family of natural products synthesized by Burkholderia thailandensis. Investigations into the detailed functions of two analogs show that they act synergistically in inhibiting bacterial growth...
September 28, 2017: Cell Chemical Biology
Ya-Nan Wang, Ling-Yan Wang, Yu-Hong Qu, Ming Jiang, Yu-Zhuo Wu, Rui Li, Bo-Lin Qiu, Su-Juan Wang, Sheng Lin
A new styrene dimer derivative has been isolated from the branch of Litsea greenmaniana by column chromatography over silica gel and Sephadex LH-20, as well as semi-preparative HPLC. Its structure was identified by spectroscopic data analysis (MS, UV, IR, 1D and 2D NMR) as (E)-2,4-bis(p-hydroxyphenyl)-2-butenol, named as listeanol. At a concentration of 1×10-5 mol•L⁻¹, compound 1 was inactive in the assays, including cytotoxicity against human tumor cell lines (HCT-8, Bel-7402, BGC-823, A549 and A2780), antioxidant activity in Fe²⁺-cystine-induced rat liver microsomal lipid peroxidation, neuroprotective activity against serum deprivation or glutamate induced neurotoxicity in cultures of PC12 cells, and the inhibitory activity against protein tyrosine phosphatase 1B (PTP1B)...
March 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Youmao Tao, Yan Song, Tao Han, Changjing Wang, Tongquan Zhao, Ye Gu
Immature colon carcinoma transcript-1 (ICT1) is a newly identified oncogene, which regulates mobility, apoptosis, cell cycle progression and proliferation of cancer cells. Nevertheless, the role of ICT1 and its clinical significance in gastric cancer (GC) is largely uncovered. Here, we found that ICT1 displayed higher expression in GC tissues compared to corresponding tumor-adjacent tissues. Further investigation confirmed ICT1 overexpression in GC cell lines. Clinical data disclosed that high ICT1 expression correlated with distant metastasis and advanced tumor-node-metastasis (TNM) stage...
October 4, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Mengdi Li, Wanpeng Cheng, Tingting Nie, Hehuan Lai, Xiaoyan Hu, Jincheng Luo, Fenglan Li, Hui Li
Selenoprotein K (SelK), a member of selenoprotein family, is identified as a single endoplasmic reticulum (ER) transmembrane protein. Although over-expression of SelK inhibits adherence and migration of human gastric cancer BGC-823 cells, the effects of SelK in human choriocarcinoma (CCA) are not well understood. In this study, the expression levels of SelK in three CCA cell lines, BeWo, JEG-3, and JAR, were examined. The effects of silencing or over-expressing SelK on expression of human chorionic gonadotropin beta subunit (β-hCG) were detected by western blotting...
October 6, 2017: Biological Trace Element Research
Qian Li, Jie Peng, Ting Liu, Guiying Zhang
Fas, which is an apoptotic-related protein, has an important role in cell apoptosis. Fas ligand (FasL) binds to Fas and activates apoptosis signal transduction. We previously demonstrated that the efficiency of celecoxib inhibited the proliferation and apoptosis of HT-29 colon cancer cell line. The BGC823 cell line was used as an experimental model to evaluate the potential role of celecoxib on gastric cancer cell apoptosis. Inhibitory effects of celecoxib on cell viability were determined by MTT assay. Cell apoptosis was evaluated by flow cytometric analysis and laser confocal microscopy...
September 2017: Experimental and Therapeutic Medicine
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