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Y. Teng



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    P1.04 - Poster Session/ Biology, Pathology, and Molecular Testing (ID 233)

    • Event: WCLC 2015
    • Type: Poster
    • Track: Biology, Pathology, and Molecular Testing
    • Presentations: 1
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      P1.04-093 - CCNY2 Promotes Lung Cancer Cell Migration and Invasion via Regulating F-Actin Expression (ID 3119)

      09:30 - 17:00  |  Author(s): Y. Teng

      • Abstract
      • Slides

      Background:
      Cyclin Y (CCNY) is a novel cyclin and is highly conserved in metazoan species. Cyclin Y mRNA has several transcripts and only ccny1 and ccny2 has been documented. A potential CDK partner of Cyclin Y is PFTAIRE kinase (PFTK1). In hepatocellular carcinoma, cell motility and invasion was enhanced by PFTK1 expression. But the function of CCNY1 and CCNY2 on cell migration and invasiveness has not been reported yet.

      Methods:
      Recombined plasmids carrying CCNY1 and CCNY2 were constructed and transfected to H1299 cells to obtain CCNY up-regulation cells. A lentivirus-based RNAi delivery system was used to inhibit CCNY mRNA expression. The role of CCNY in cell motility and invasion was investigated using wound healing and transwell assay. The protein levels in lung cancer cells were determined by western-blot, immunofluorescence technique and high-content cell analysis. Mouse xenograft experiments were carried out to study the metastasis ability of CCNY1 and CCNY2 in vivo. Immunohistochemistry was used to detect the CCNY protein level of lung cancer tissues.

      Results:
      cell motility and invasion activity were inhibited and MET (Mesenchymal - Epithelial Transition) was caused by down-regulating of CCNY in 95D and H1299 cells. CCNY2 could enhance cell migration and invasion activity in vivo and vitro. The F-actin level was regulated by CCNY2 expression. In non-small cell lung cancer tissues, CCNY2 was highly expressed and the CCNY2 expression was associated with histological grade.

      Conclusion:
      CCNY2 was firstly detected in lung cancer cells and non-small cell lung cancer tissues. Our findings demonstrated CCNY2 not CCNY1 promoted cell motility and invasion by regulating the expression of F-actin and modulating intracellular cytoskeletal components.

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    P3.04 - Poster Session/ Biology, Pathology, and Molecular Testing (ID 235)

    • Event: WCLC 2015
    • Type: Poster
    • Track: Biology, Pathology, and Molecular Testing
    • Presentations: 1
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      P3.04-070 - Early Prognostic Significance of Circulating Laminin γ2-Chain Fragment in Non-Small-Cell Lung Cancer (ID 3164)

      09:30 - 17:00  |  Author(s): Y. Teng

      • Abstract

      Background:
      Laminin γ2-chain (LN-γ2), a distinctive subunit of heterotrimeric laminin-332, is frequently up-regulated in various types of carcinomas, and is of great importance in the biological processes including cell migration and tumor invasion. Despite of this, the status of circulating LN-γ2 fragment in lung cancer patients is still uncertain.

      Methods:
      In this study, serum samples from 538 all-stage (stage I-IV) patients of non-small-cell lung cancer (NSCLC) and 94 age-matched normal volunteers were determined by enzyme-linked immunosorbent assay. Data were statistically analyzed in combination with clinicopathological information.

      Results:
      Compared to the normal controls, serum LN-γ2 concentration is drastically increased in NSCLC patients (P < 0.001), even in early cases of stage I patients (P < 0.001). Furthermore, our data suggested that serum LN-γ2 level was in close correlation to male gender (P < 0.001) and smoking status (P < 0.001) with a higher positive rate relative to each counterpart, but was not significant between adenocarcinoma and squamous cell carcinoma histologies (P = 0.879). We also found that circulating LN-γ2 could reflect the progression of lung cancer with higher serum levels or positive rates in higher tumor-node-metastasis (TNM) stages. Survival analysis on 370 eligible patients who underwent a follow-up examination up to 4 years indicated that patients of serum LN-γ2 positive group survived markedly shorter compared with those in the negative group (P = 0.028), and it was especially the case for clinical stage I (N = 72, P < 0.001) and stage T1 (N = 67, P = 0.001), even for stage N0 patients (N = 148, P = 0.038), which all represent groups of early cases. As for the patients of advanced stages, however, it was not the case that the overall survival rates between LN-γ2 positive and negative patients were not significantly different among clinical stages II-IV (P = 0.830), stages T2-4 (P = 0.575), stages N1-3 (P = 0.669), and stage M1 (P = 0.849) groups, respectively. Subsequently, Cox regression analysis was performed to define serum LN-γ2 as an independent prognostic indicator in the all-stage NSCLC cases (N = 370, univariate, P = 0.035; multivariate, P = 0.007). Worthy of note, however, in the multivariate analysis on those more advanced cases (stage II-IV), no statistical significance was observed on the serum levels of Ln-γ2 (N = 298, P = 0.234).

      Conclusion:
      In summary, our study suggests circulating LN-γ2 to be a promising diagnostic biomarker for early-stage NSCLC and an effective indicator of tumor progression. It is proposed that circulating LN-γ2 might be important and applicable for the prognosis of early-stage NSCLC patients, rather than that of advanced cases.