, Volume 8, Issue 1, pp 11–18

Roles of the stress-induced gene IEX-1 in regulation of cell death and oncogenesis


DOI: 10.1023/A:1021688600370

Cite this article as:
Wu, M.X. Apoptosis (2003) 8: 11. doi:10.1023/A:1021688600370


In response to changes in the external environment cells must initiate a coordinated program of gene expression for them to adapt. IEX-1 (immediate early response gene X-1) is precisely regulated by multiple transcription factors among which p53, NF-κB/rel, Sp1 and c-Myc play central roles, to ensure rapid and transient expression of IEX-1 in cells under a variety of stress conditions. Overexpression of IEX-1 renders some cells sensitive to apoptosis and accelerates cell cycle progression, but reduces proliferation of other cells, whereas disruption of IEX-1 expression is associated with decreases in both apoptosis and cell cycle progression. In sharp contrast to in vitro studies, in vivo constitutive expression of IEX-1 prevents activated T cells but not B cells from apoptosis, as shown using IEX-1-transgenic mice that target IEX-1 expression specifically to lymphocytes driven by the Eμ enhancer. The animals developed a lupus-like disease and subsequently a high incidence of T cell lymphomas when they aged, due to insufficient apoptosis of T cells. These varied effects of IEX-1 on cell death and cell cycle progression in a cell-context dependent fashion implicate that IEX-1 is involved in more than one signaling pathway, understanding of which will certainly improve our knowledge with respect to cancer biology, cell death and cell cycle regulation.

apoptosis IEX-1 lymphoma multiple transcription factors 

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  1. 1.Department of Molecular and Cell BiologyBoston University Goldman School of Dental MedicineBostonUSA

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