期刊
CELL DEATH AND DIFFERENTIATION
卷 16, 期 12, 页码 1615-1621出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/cdd.2009.97
关键词
IPS-1; DAP3; anoikis; casapse-8; ECM
资金
- Ministry of Education, Culture, Sports, Science Technology
- Japan Health Sciences Foundation
- Grant of the Program of Founding Research Centers for Emerging and Reemerging Infectious Diseases
- National Institutes of Health [GM61694, AI5624]
Detachment of adherent epithelial cells from the extracellular matrix induces apoptosis, a process known as anoikis. We have shown that DAP3 is critical for anoikis induction. However, the mechanism for anoikis induction mediated by DAP3 is still unclear. Here, we show that interferon-beta promoter stimulator 1 (IPS-1) binds DAP3 and induces anoikis by caspase activation. Recently, IPS-1 has been shown to be critical for antiviral immune responses, although there has been no report of its function in apoptosis induction. We show that overexpression of IPS-1 induces apoptosis by activation of caspase-3, -8, and -9. In addition, IPS-1 knockout mouse embryonic fibroblasts were shown to be resistant to anoikis. Interestingly, IPS-1 expression, recruitment of caspase-8 to IPS-1, and caspase-8 activation were induced after cell detachment. Furthermore, DAP3-mediated anoikis induction was inhibited by knockdown of IPS-1 expression. Therefore, we elucidated a novel function of IPS-1 for anoikis induction by caspase-8 activation. Cell Death and Differentiation (2009) 16, 1615-1621; doi: 10.1038/cdd.2009.97; published online 31 July 2009
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