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J. Cell Biol.,
Volume 143, Number 5, November 30, 1998 1353-1360


* Department of Genetics and The binding of Fas ligand to Fas recruits
caspase 8 to Fas via an adaptor, FADD/MORT1, and
activates a caspase cascade leading to apoptosis. Here,
we describe a human Jurkat-derived cell line (JB-6)
that is deficient in caspase 8. This cell line was resistant to the apoptosis triggered by Fas engagement. However, the multimerization of Fas-associated protein
with death domain, through the use of a dimerizing system, killed the JB-6 cells. This killing process was not
accompanied by the activation of caspases or DNA
fragmentation. The dying cells showed neither condensation nor fragmentation of cells and nuclei, but the
cells and nuclei swelled in a manner similar to that seen
in necrosis. These results suggested that Fas-associated
protein with death domain can kill the cells via two
pathways, one mediated by caspases and another that
does not involve them.
Department of Anatomy, Osaka University Medical School, Yamada-oka, Suita, Osaka
565-0871, Japan; and § Osaka Bioscience Institute, Furuedai, Suita, Osaka 565-0874, Japan
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