13 research outputs found

    New Pyridinium Ylide Dyes for Dye Sensitized Solar Cell Applications

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    Novel organic pyridinium ylide sensitizers (NO109–111) consisting of various anchoring groups were synthesized and characterized for applications in dye sensitized solar cells. Compared with the pyridine-<i>N</i>-oxide dye (NO108), the ylide sensitizers with strong electron-withdrawing acceptors exhibited dominant ultraviolet absorption properties and efficient binding abilities to the TiO<sub>2</sub> surface. Among these dyes, the pyridinium ylide NO111 sensitized solar cell showed the highest efficiency (5.15%), which was improved to 7.41% by employing coadsorbent chenodeoxycholic acid

    Tcf-4 knockdown suppresses Wnt signaling in colon cancer cells.

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    <p>SW480 and HCT116 cells were treated with adenoviruses (50 MOI) carrying shRNA. <b>a</b>, At 24 h post-infection, the cells were cotransfected with reporter genes harboring Tcf-4 binding sites (TOPflash) or a mutant Tcf-binding site (FOPflash), respectively, together with pRL-TK. Luciferase activity was determined 24 h post-transfection, normalized against values for the corresponding pRL-TK activity. Values represent means ± s.d. of three independent experiments. *<i>P</i><0.01 versus control shRNA. <b>b</b>, At 48 h post-infection, cells were harvested and protein expression was determined by western blot.</p

    Effect of adenovirus-mediated transduction of shRNA on the expression of β-catenin and Tcf-4 in colon cancer cells.

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    <p>SW480 and HCT116 cells were treated with different multiplicity of infection (MOI) of adenovirus carrying shRNA. Samples were collected at 48 h post-infection. Western blot analysis of cell lysates for the protein expression of β-catenin (a) and Tcf-4 (b).</p

    Tcf-4 knockdown is more effective at enhancing chemosensitivity than β-catenin knockdown in colon cancer cells.

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    <p>Cells were infected with adenoviruses (50 MOI) carrying shRNA; 48 h post-infection, cells were treated with 5-FU or oxaliplatin at various concentrations for 72 h. The cell viability was determined using an MTT assay. Bar graphs represent the mean values of triplicate determinations ± s.d.</p

    Tcf-4 knockdown is more effective at inhibiting cell proliferation and inducing apoptosis than β-catenin knockdown in colon cancer cells.

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    <p>Cells were treated with adenoviruses (50 MOI) carrying shRNA for 24 h. <b>a,</b> Cell proliferation was determined using a colony formation assay. <b>b,</b> Cell apoptosis was determined using Annexin-V-FITC staining. <b>c</b>, The expression of proapoptotic enzyme caspase-3 was determined by western blot. Each data point represents the mean ± s.d. of three or more independent determinations. *<i>P</i><0.01 versus control shRNA; <sup>#</sup><i>P</i><0.05 versus β-catenin shRNA; <sup>##</sup><i>P</i><0.01 versus β-catenin shRNA.</p

    Tcf-4 knockdown enhances FOXO4 activity in colon cancer cells.

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    <p>SW480 and HCT116 cells were treated with adenoviruses (50 MOI) carrying shRNA. Samples were collected at 48 h post-infection. The protein level of FOXO4, phosphorylated FOXO4 S193, p27Kip1, and MnSOD was determined by western blot.</p
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