1,721,054 research outputs found
Abstract 3883: Transcriptome analysis reveals mitochondrial gene signature upregulation in gastric cancers expressing the stem cell marker CD133
No full textAbstract
Gastric cancers expressing the stem cell marker CD133 are more aggressive than those that do not express the marker, and are associated with more unfavorable clinical outcomes. The CD133-associated aggressive behavior of gastric cancer remains poorly understood at the molecular level. In the present study, we performed gene expression profiling of bead-sorted CD133+ and CD133- KATO III cell lines to derive in vitro molecular signatures of CD133 expression in gastric cancer. Three expression signatures associated with CD133 expression ('Mitochondria', 'Cell cycle', and 'Lipid metabolism') were inferred upon study of a module association map of the key molecular signatures associated with CD133 expression in gastric cancer. Using the public gene expression profiles, we show that the patients with overexpression of CD133 show unfavorable clinical outcomes compared to CD133- patients in the context of up-regulation of 'Mitochondria' expression signature. We further showed that CD133+ KATO III cells had a higher mitochondrial function and were more susceptible to the mitochondrial inhibitors rotenone, antimycin A, and NaN3, than were CD133- cells. Together, our findings suggest that transcriptional up-regulation of the 'Mitochondria' gene signature may identify CD133+ gastric cancers; such data are of clinical and pharmacological relevance.
Note: This abstract was not presented at the meeting.
Citation Format: Han Hong Lee, Yoon Ho Ko, Tae-Min Kim, Won-Sang Park. Transcriptome analysis reveals mitochondrial gene signature upregulation in gastric cancers expressing the stem cell marker CD133 [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 3883. doi:10.1158/1538-7445.AM2017-3883</jats:p
Abstract 1466: QKI, a miRNA-200 target gene, suppresses epithelial-to-mesenchymal transition in oral squamous cell carcinoma cells
No full textAbstract
Objectives:
The microRNA (miR)-200 family plays a major role in specifying the epithelial phenotype by preventing expression of the transcription repressors, ZEB1 and ZEB2, which are well-known regulators of epithelial-to-mesenchymal transition (EMT) in epithelial tumors including oral squamous cell carcinoma (OSCC). Here, we elucidated whether the miR-200 family members control RNA-binding protein quaking (QKI) which is a newly identified tumor suppressor and is regulated during EMT.
Methods:
We predicted that miR-200a and miR-200b could recognize QKI 3’-UTR by analyzing TargetScan and TCGA head and neck SCC dataset. To further verify the role of miR-200 on QKI in HNSCC, we carried out the functional study in CAL27 and HSC3 cells.
Results:
Forced expression of miR-200b/a/429 inhibited the expression of ZEB1 and ZEB2, and decreased cell migration in CAL27 and HSC3 cells. QKI expression was also suppressed by miR-200 over-expression, and the 3’-UTR of QKI mRNA was directly targeted by miR-200 in luciferase reporter assays. Interestingly, shRNA-mediated knockdown of QKI led to pronounced EMT and pro-tumor effects in vitro and in vivo studies of OSCC.
Conclusion:
QKI increases during EMT and is targeted by miR-200; while, it suppresses EMT and tumorigenesis, contradictorily. We suggest that QKI and miR-200 could form a balancing feedback loop maintaining homeostatic responses to EMT-inducing signals.
Citation Format: Yoon Ho Ko, Eun Ju Kim, Der Sheng Sun, Hye Sung Won, Young-Ho Ahn. QKI, a miRNA-200 target gene, suppresses epithelial-to-mesenchymal transition in oral squamous cell carcinoma cells [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 1466. doi:10.1158/1538-7445.AM2017-1466</jats:p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Abstract 301: Prognostic value of metastatic tumoral caveolin-1 expression in patients with resected gastric cancer
No full textAbstract
Background : Caveolin-1 (Cav-1), as the main component of caveolae, has complex roles in tumourigenesis and clinical outcomes in a variety of human malignancies. We investigated Cav-1 in primary and metastatic tumor of gastric cancer (GC) and its association with clinical outcomes.
Method : All specimens evaluated were obtained from 145 patients with GC who had undergone curative gastrectomy. The primary outcomes measured were the expression levels of Cav-1 by immunohistochemistry and its association with clinicopathologicalparameters and patient survival.
Results : Among the 145 patients, the frequency of high expression of stromal Cav-1 within primary tumor and tumoral Cav-1 protein in metastatic lymph node were 22.5% (18/145) and 16.6% (15/91). In the multivariate analysis tumoral Cav-1 protein in metastatic lymph node showed prognostic significance for relapse-free survival (RFS, HR, 3.934; 95% CI, 1.882-8.224; P&lt;0.001) and cancer-specific survival outcome (CSS, HR, 3.985; 95% CI, 1.620 - 8.623; P = 0.002). In addition, it remained as a strong indicator of poor prognosis for RFS (HR, 3.137; 95% CI, 1.445 - 6.810; P = 0.004) and CSS (HR, 2.509; 95% CI, 1.079 - 5.838; P = 0.033).
Conclusions : High expression of tumoral Cav-1 protein in metastatic lymph node shows a strong negative association with the clinical outcomes in patients with curatively resected GC, suggesting that this protein have potential uses as novel prognostic markers.
Citation Format: Jihyung Hong, Der Sheng Sun, Soon Auck Hong, Hye Sung Won, Han Hong Lee, Okran Kim, Yoon Ho Ko. Prognostic value of metastatic tumoral caveolin-1 expression in patients with resected gastric cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 301. doi:10.1158/1538-7445.AM2017-301</jats:p
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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