國家衛生研究院 NHRI:Item 3990099045/2146
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    題名: Coordinating Etk/Bmx activation and VEGF upregulation to promote cell survival and proliferation
    作者: Chau, CH;Chen, KY;Deng, HT;Kim, KJ;Hosoya, K;Terasaki, T;Shih, HM;Ann, DK
    貢獻者: Division of Molecular and Genomic Medicine
    摘要: Etk/Bmx, a member of the Tee family of non-receptor tyrosine kinase, is characterized by an N-terminal PH domain and has recently been shown to be involved in the regulation of various cellular processes, including proliferation, differentiation, motility and apoptosis. Since VEGF and the activation of its signaling pathway have been implicated in modulating a variety of biological responses, we characterized the role of Etk-dependent signaling pathways involved in the upregulation of VEGF expression, and explored the functional implications of this enhancement in sustaining cell proliferation and survival. Using Northern and Western analyses, transient transfections, and pharmacological agents, we demonstrate that Elk activation alone is sufficient to transcriptionally induce VEGF expression, independent of the previously identified hypoxia response element (HRE), in both Pa-4 epithelial and TR-BBB endothelial cells under normoxia. In addition, Elk utilizes both MEK/ERK and PI3-K/Pak1 signaling pathways in concert to activate VEGF transcription. Functionally, Etk activation elicits a profound stimulatory effect on TR-BBB cell proliferation and formation of capillary-like networks in Matrigel containing reduced levels of growth factors. Finally, antisense oligonucleotides against either endogenous VEGF or Etk abrogate the proliferation of Elk-activated TR-BBB cells, and exogenous VEGF treatment stimulates endogenous Elk tyrosine phosphorylation in HUVECs. Taken together, these results indicate that VEGF is both an Etk downstream target gene and an Elk upstream activator, constituting a reciprocal Etk-VEGF autoregulatory loop. These findings, to our knowledge, are the first delineation of a network of positive feedforward signaling pathways that converge on the Etk-VEGF axis, causally associating Elk-mediation of VEGF induction with enhanced cellular processes in both epithelial and endothelial cells.
    關鍵詞: Biochemistry & Molecular Biology;Oncology;Cell Biology;Genetics & Heredity
    日期: 2002-12-12
    關聯: Oncogene. 2002 Dec;21(57):8817-8829.
    Link to: http://dx.doi.org/10.1038/sj.onc.1206032
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0950-9232&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000179734400015
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0037069931
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