Ying-Na Bao

Publications (2)13.56 Total impact

• Source

  Available from: PubMed Central

  Article: As an independent unfavorable prognostic factor, IL-8 promotes metastasis of nasopharyngeal carcinoma through induction of epithelial-mesenchymal transition and activation of AKT signaling.

  Xin-Jian Li, Li-Xia Peng, Jian-Yong Shao, Wen-Hua Lu, Jia-Xing Zhang, Shi Chen, Zhi-Yuan Chen, Yan-Qun Xiang, Ying-Na Bao, Fang-Jing Zheng, Mu-Sheng Zeng, Tie-Bang Kang, Yi-Xin Zeng, Bin Tean Teh, Chao-Nan Qian
  [show abstract] [hide abstract]
  ABSTRACT: Nasopharyngeal carcinoma (NPC) has the highest metastatic potential among head and neck cancers. Distant metastasis is the major cause of treatment failure. The role of interleukin-8 (IL-8) in NPC progression remains unknown. Our multivariate survival analyses of 255 patients with NPC revealed that higher IL-8 expression in primary NPC tissue was an independent prognostic factor for overall survival, disease-free survival, and distant metastasis-free survival of the patients. In vitro study revealed that IL-8 was highly expressed in the established high-metastasis NPC clone S18 relative to the low-metastasis cells. Suppression of IL-8 by short-hairpin RNA reduced the expression of IL-8 in S18 cells and subsequently inhibited migration, invasion, and hepatic metastasis of the cells without influencing cellular growth. Overexpression of IL-8 in S26 cells resulted in increased migration, invasion, and metastasis capabilities of the cells without affecting cellular growth. Exogenous IL-8 enhanced the migration and invasion of low-metastasis CNE-2 cells in a dose-dependent manner. An epithelial-mesenchymal transition (EMT) could be induced by IL-8 in various NPC cell lines. The high level of phosphorylated AKT in S18 cells could be suppressed by knocking down IL-8 expression. Further, IL-8-promoted migration and invasion could be abolished by either the application of the phosphoinositide-3-kinase inhibitor LY294002 or the knock down of AKT expression by using small-interfering RNA. In summary, IL-8 serves as an independent prognostic indicator of overall survival, disease-free survival, and metastasis-free survival for patients with NPC. IL-8 promotes NPC metastasis via autocrine and paracrine means, involving activation of AKT signaling and inducing EMT in NPC cells.
  Carcinogenesis 05/2012; 33(7):1302-9. · 5.70 Impact Factor
• Article: Serglycin is a theranostic target in nasopharyngeal carcinoma that promotes metastasis.

  Xin-Jian Li, Choon Kiat Ong, Yun Cao, Yan-Qun Xiang, Jian-Yong Shao, Aikseng Ooi, Li-Xia Peng, Wen-Hua Lu, Zhongfa Zhang, David Petillo, [......], Ying-Na Bao, Fang-Jing Zheng, Claramae Shulyn Chia, N Gopalakrishna Iyer, Tie-Bang Kang, Yi-Xin Zeng, Khee Chee Soo, Jeffrey M Trent, Bin Tean Teh, Chao-Nan Qian
  [show abstract] [hide abstract]
  ABSTRACT: Nasopharyngeal carcinoma (NPC) is known for its high-metastatic potential. Here we report the identification of the proteoglycan serglycin as a functionally significant regulator of metastasis in this setting. Comparative genomic expression profiling of NPC cell line clones with high- and low-metastatic potential revealed the serglycin gene (SRGN) as one of the most upregulated genes in highly metastatic cells. RNAi-mediated inhibition of serglycin expression blocked serglycin secretion and the invasive motility of highly metastatic cells, reducing metastatic capacity in vivo. Conversely, serglycin overexpression in poorly metastatic cells increased their motile behavior and metastatic capacity in vivo. Growth rate was not influenced by serglycin in either highly or poorly metastatic cells. Secreted but not bacterial recombinant serglycin promoted motile behavior, suggesting a critical role for glycosylation in serglycin activity. Serglycin inhibition was associated with reduced expression of vimentin but not other epithelial-mesenchymal transition proteins. In clinical specimens, serglycin expression was elevated significantly in liver metastases from NPC relative to primary NPC tumors. We evaluated the prognostic value of serglycin by immunohistochemical staining of tissue microarrays from 263 NPC patients followed by multivariate analyses. High serglycin expression in primary NPC was found to be an unfavorable independent indicator of distant metastasis-free and disease-free survival. Our findings establish that glycosylated serglycin regulates NPC metastasis via autocrine and paracrine routes, and that it serves as an independent prognostic indicator of metastasis-free survival and disease-free survival in NPC patients.
  Cancer Research 02/2011; 71(8):3162-72. · 7.86 Impact Factor