IPS-1 is crucial for DAP3-mediated anoikis induction by caspase-8 activation.
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.
Li
H-M
HM
Department of Bioresources, Hokkaido University Research Center for Zoonosis Control, Sapporo, Hokkaido 001-0020, Japan.
Fujikura
D
D
Harada
T
T
Uehara
J
J
Kawai
T
T
Akira
S
S
Reed
J C
JC
Iwai
A
A
Miyazaki
T
T
D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D023102:Anoikis; D051017:Apoptosis Regulatory Proteins / Q000235:genetics / Q000378:metabolism*; D053181:Caspase 8 / Q000378:metabolism*; D002460:Cell Line; D004789:Enzyme Activation; D006801:Humans; D051379:Mice; D011485:Protein Binding; D034741:RNA, Small Interfering / Q000235:genetics; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins / Q000235:genetics / Q000378:metabolism*
D048868:Adaptor Proteins, Signal Transducing; D051017:Apoptosis Regulatory Proteins; D053181:Caspase 8; D034741:RNA, Small Interfering; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins; C097041:DAP3 protein, human; C512612:MAVS protein, mouse; C505371:MAVS protein, human