Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024623 (gastric cancer)
 36,219 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The purpose of this study was to investigate the anticancer activity of 15 traditional Chinese medicines which are usually used for tumor patients in China. The MTT (methylthiazolyldiphenyl-tetrazolium bromide) method was applied to compare the antitumoral activity of the aqueous crude extracts and the ethanol crude extracts of these drugs on six human digestive tumor cell lines: human liver carcinoma cell lines (HepG-2 and SMMC-7721), human gastric cancer cell line (BGC-823), human colon adenocarcinoma cell lines (LoVo and SW-116) and esophagus adenocarcinoma cell line (CaEs-17). Most ethanol extracts demonstrated a more powerful inhibitory effect than aqueous extracts. Their IC50 values were between 10 microg/mL and 500 microg/mL. Among these drugs, Paris polyphylla Smith showed a predominant inhibitory effect on all the cell lines with IC50 values ranging from 10 microg/mL to 30 microg/mL. The findings in this study suggested that traditional Chinese medicines, especially Paris polyphylla Smith, might have potential anticancer activity on digestive cancer and its mechanism needs further study.
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PMID:In vitro anticancer activity of aqueous extracts and ethanol extracts of fifteen traditional Chinese medicines on human digestive tumor cell lines. 1763 50

Previous in vivo studies have suggested that lactobacilli can exert anti-proliferative effects on the gastric epithelium. However, few data are available on their mechanisms of action. The aim of this study was to investigate the effects of increasing concentrations of Lactobacillus rhamnosus strain GG (L. GG) homogenate on cell growth and proliferation [by 3-(4,5 di-methylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, [(3)H]-thymidine incorporation and polyamine biosynthesis] and apoptosis processes (by Bax/Bcl-2 mRNA expression) in HGC-27 human gastric cancer cells. To verify which bacterial fraction was involved in the antiproliferative and proapoptotic effects, the cytoplasm and cell wall extracts were tested separately. HGC-27 cells were sensitive to the apoptotic induction and growth inhibition by increased concentrations of bacterial homogenate. HGC-27 cells were resistant to the bacterial cell wall fractions, whereas increasing cytoplasm fraction concentrations induced evident antiproliferative and proapoptotic actions. These data suggest that cytoplasm extracts could be responsible for L. GG action on HGC-27 cell proliferation.
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PMID:Effects of Lactobacillus rhamnosus GG on the cell growth and polyamine metabolism in HGC-27 human gastric cancer cells. 1792 9

We prepared an anticancer drug based on a pH-sensitive liposome retaining Fe-porphyrin as an SOD mimic. The liposomes contained cationic/anionic lipid combinations and were composed of Fe-porphyrin, 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine, dimethylditetradecylammonium bromide, sodium oleate, and Tween-80. The Fe-porphyrin was released from the liposome at low pH, and the cytotoxicity for cancer cells by the liposome depended on the acidic environments of the endosomes in the cells. Furthermore, although the liposome exhibited an excellent anticancer effect on a gastric cancer cell line, the SOD activity of Fe-porphyrin was shown to have a significant influence on the cytotoxicity toward cancer cells. These findings suggest that the pH-sensitive liposome retaining the Fe-porphyrin as an SOD mimic promises to be a novel anticancer drug for endosomal escape.
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PMID:Preparation of pH-sensitive liposomes retaining SOD mimic and their anticancer effect. 1877 54

In recent years, natural dietary agents have drawn a great deal of attention owing to their demonstrated ability to suppress cancer. We aimed to investigate the in-vitro gastric cancer preventive activity of a methanol extract obtained from table olives of Greek origin. Tested were AGS cell proliferation, induction of apoptosis and inhibition of inflammation. AGS stomach cancer cells were cultured at a density of 10 cells/ml. Methanol extract of olive was added to cultures at concentrations of 2.0, 1.6, 1.0, and 0.4 microg phenols/ml. Effect on cellular viability was evaluated via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and percentages of early and late apoptotic cells were assayed by annexin V-FITC staining on a FACS scan. Interleukin-8 (IL-8) and intercellular adhesion molecule (ICAM)-1 mRNA and protein production were measured by applying reverse transcriptase-PCR and enzyme-linked immunosorbent assay. Olive extract significantly suppressed cell proliferation at 2.0, 1.6, and 1.0 microg phenols/ml. Flow cytometric analysis of Annexin-V labeled cells indicated that 2.0 microg phenols/ml significantly induced apoptosis. Similarly, at 2.0, 1.6, and 1.0 microg phenols/ml a significant decrease of ICAM-1 and IL-8 protein levels was observed. ICAM-1, as well as IL-8, mRNA expression were decreased in the presence of 2.0 microg phenols/ml. Results indicate that the methanol extract from olives, rich in phenolic compounds, exhibits gastric cancer preventive efficacy by limiting cell proliferation, inducing cell death and suppressing inflammation in AGS cells.
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PMID:In-vitro gastric cancer prevention by a polyphenol-rich extract from olives through induction of apoptosis. 1907 62

The major biophenols in olives and the crude extract and ethyl acetate fraction from olive mill waste were studied for their ability to counteract different stages of oxidative damage, that is, hydrogen peroxide, superoxide radical (SOR), and hydroxyl radical in vitro. Antiproliferative activity on colon cancer (HT-29) and gastric cancer (AGS) cell lines was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide bioassay. Emphasis was given to how the observed in vitro activity is controlled by the structural feature of biophenols and possible synergism and antagonism. While in some bioassays, for example, 2,2'-diphenyl-1-picrylhydrazyl, the nonphenolic moiety had minimal affect, it had a significant role in the SOR scavenging bioassay. Verbascoside was more active than caffeic acid or hydroxytyrosol evaluated individually or in equimolar mixtures in some bioassays. Mixtures of biophenols were more active than individual biophenols as antiproliferative agents. Overall, the mixture of hydroxytyrosol/caffeic acid and the biophenol extracts were more effective in protecting DNA from oxidative damage and inhibiting the growth of cancer cells.
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PMID:Chemistry and bioactivity of olive biophenols in some antioxidant and antiproliferative in vitro bioassays. 1909 1

This study examined the mechanism by which the gastric cancer cells lead to early peritoneal metastasis. HMrSV5 cells, a human peritoneal mesothelial cell line, were co-incubated with the supernatants of gastric cancer cells. Morphological changes of HMrSV5 cells were observed. The cell damage was quantitatively determined by MTT assay. The apoptosis of HMrSV5 cells was observed under transmission electron microscope. Acridine orange/ethidium bromide-stained condensed nuclei was detected by fluorescent microscopy and flow cytometry. The expressions of Bcl-2 and Bax was immunochemically evaluated. The results showed that conspicuous morphological changes of apoptosis were observed in HMrSV5 cells 24 h after treatment with the supernatants of gastric cancer cells. The supernatants could induce apoptosis of HMrSV5 cells in a time-dependent manner. The supernatants could up-regulate the expression of Bax and suppress that of Bcl-2 in HMrSV5 cells. These findings demonstrated that gastric cancer cells can induce the apoptosis of HPMCs through supernatants in the early peritoneal metastasis. The abnormal expressions of Bcl-2 and Bax may contribute to the apoptosis. Anti-apoptosis drugs promise to be adjuvant chemotherapeutic agents in the treatment of peritoneal metastasis of gastric cancer.
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PMID:Destruction of gastric cancer cells to mesothelial cells by apoptosis in the early peritoneal metastasis. 1939 97

Beta-sitosterol is an important phytosterol found in plant food. It has been shown to have antiproliferative effects on cancers of the colon, breast, and prostate, but its effect on stomach cancer cells in vitro is unknown. Proliferation, cytotoxicity, and apoptosis in SGC-7901 human stomach cancer cells were examined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, clone formation, lactate dehydrogenase (LDH) leakage assay, acridine orange (AO)/ethidium bromide (EB) double staining, 4',6-diamidine-2'-phenylindole dihydrochloride (DAPI) staining, comet assay, and Western blotting. The results showed that beta-sitosterol suppresses the proliferation and induces the cell cytotoxicity of SGC-7901 stomach cancer cells in a time- and dose-dependent manner. Cells treated with different concentrations of beta-sitosterol also showed changes typical of apoptosis: morphological changes, DNA damage, increased expression of pro-caspase-3 and bax (p < 0.05), and activation of pro-caspase-3 and suppression of bcl-2 expression (p < 0.05). This study therefore revealed that beta-sitosterol significantly inhibits the growth and induces the apoptosis of SGC-7901 human stomach cancer cells in vitro. The decrease of the bcl-2/bax ratio and DNA damage may be the critical mechanisms of apoptosis induced by beta-sitosterol in SGC-7901 human stomach cancer cells.
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PMID:Beta-sitosterol inhibits cell growth and induces apoptosis in SGC-7901 human stomach cancer cells. 1945 33

2',4'-Dihydroxychalcone (TFC), one of the main components in Herba Oxytropis, belongs to the flavonoid group, which is known to have anti-tumor activity in vitro. In this study, the authors examined the effects of TFC on cell proliferation and apoptosis in human gastric cancer MGC-803 cells. The MTT assay results showed that TFC was able to induce cytotoxicity in MGC-803 cells in a concentration- and time-dependent manner. Acridine orange/ethidium bromide (AO/EB) staining analysis indicated that the cytotoxicity induced by TFC was mediated by apoptosis, and flow cytometry analysis indicated an increase in apoptotic cells after treatment with TFC. Furthermore, typical apoptotic morphology such as condensed chromatin, irregular nuclei, vacuoles, and dispersed granular material in the nuclear compartment were also observed using a transmission electron microscope. These results suggested that TFC can inhibit the growth of MGC-803 cells and induce apoptosis. However, further studies are necessary to investigate the possible mechanism.
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PMID:Preliminary studies on anti-tumor activity of 2',4'-dihydroxychalcone isolated from Herba Oxytropis in human gastric cancer MGC-803 cells. 1945 54

Two new complexes ZnL(2)x2H(2)O (1) and CuL(2)x2H(2)O (2) (HL=1-hydroxy-6-(2-(1-piperidinyl)ethoxy)xanthone) have been synthesized and characterized. Their interactions with calf thymus DNA (ct DNA) were investigated by absorption spectroscopy, fluorescence spectroscopy, ethidium bromide (EB) displacement experiments, circular dichroism spectroscopy and viscosity measurements. Experimental results suggested that there were intercalative interactions of the complexes with DNA. The binding affinity of complex 2 was higher than that of 1. In addition, the cytotoxic effects of both complexes were evaluated with lung adenocarcinoma (GLC-82), esophagus squamous cancer (ECA109) and human gastric cancer (SGC7901) cells using MTT assay. Both were potent exhibiting significant cytotoxicity in vitro.
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PMID:Synthesis and characterization of the Zn(II) and Cu(II) piperidinyl isoeuxanthone complexes: DNA-binding and cytotoxic activity. 1960 5

Lycium barbarum polysaccharide (LBP) is extracted from the traditional Chinese herb Lycium barbarum, and has potential anticancer activity. However, the detailed mechanisms are largely unknown. The purpose of this study was to observe the anticancer effect of LBP on human gastric cancer, and its possible mechanisms. Human gastric cancer MGC-803 and SGC-7901 cells were treated with various concentrations of LBP for 1-5 days, and cell growth was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay. Distribution of the cell cycle was analyzed by flow cytometry. Western blotting was used to indicate changes in the level of cyclins and cyclin-dependent kinases (CDKs). LBP treatment inhibited growth of MGC-803 and SGC-7901 cells, with cell-cycle arrest at the G0/G1 and S phase, respectively. We believe that this is the first study to show that LBP arrested different cell lines from the same types of cancer at different phases. The changes in cell-cycle-associated protein, cyclins, and CDKs were consistent with the changes in cell-cycle distribution. This study suggests that induction of cell-cycle arrest participates in the anticancer activity of LBP on gastric cancer cells.
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PMID:Growth inhibition and cell-cycle arrest of human gastric cancer cells by Lycium barbarum polysaccharide. 1966 55


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