Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

Browse

Filters

20151

Settings

Author: search.filters.author.Jiang, XiaojingSubject: search.filters.subject.Apoptosis

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    THE POTENTIAL DICHOTOMOUS ROLE OF ACTIVATING TRANSCRIPTION FACTOR 3 (ATF3) IN COLON CANCER
    (2015) Jiang, Xiaojing; Lee, Seong-Ho; Nutrition; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Colorectal cancer (CRC) is the third leading cause of cancer-related death in the United States. During the tumorigenesis and metastasis of CRC, cells encounter numerous cellular and molecular events. ATF3, a member of the ATF/CREB transcription factor family, plays an important role on regulation of apoptosis and is regarded as a potential molecular target for chemoprevention and chemotherapy of colon cancer. The current study was performed to investigate cellular and molecular mechanisms by which ATF3 affects colon cancer-related phenotypes including apoptosis and metastasis. Here, we demonstrated that knockdown of ATF3 using small interfering RNA (siRNA) promotes the expression of anti-apoptotic protein, B-cell lymphoma 2 (Bcl-2), in colon cancer cells, while overexpression of ATF3 resulted in a dramatic decrease in Bcl-2 protein. Gain of function of ATF3 in colon cancer cell line HCT116 led to an increase of pro-apoptotic protein Bcl-2 homologous antagonist killer (Bak), followed by the induction of apoptosis. Furthermore, we observed that ATF3 overexpression downregulated expression of epithelial-mesenchymal transition (EMT)-related transcription factors. However, mammosphere forming assay indicated that ATF3 overexpressed colon cancer cells form larger and more budding sites compared to control, which is associated with an increase of cluster of differentiation 44 (CD44) expression and a decrease of retinoblastoma (Rb) and tight junction protein zonula occludens (ZO)-1. This study suggested that ATF3 may play a dichotomous role in regulation of apoptosis and metastasis in colon cancer.