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CED-9 prevents apoptosis in embryonic cells of Caenorhabditis elegans but not in mammalian cells. We show here that the prevention of apoptosis in mammalian cells requires a CED-3-cleaved form (68-280) of CED-9 which is localized in the inner mitochondrial membrane. The viability of PC12 and HeLa cells was significantly increased after death stimuli when truncated CED-9 was expressed in these cells but full-length CED-9 did not. The truncated CED-9 expressed in these cells was largely localized to the inner mitochondrial and the endoplasmic reticulum membranes, while full-length CED-9 was detected mainly in endoplasmic reticulum fractions. Moreover, truncated CED-9 in purified mitochondria was resistant to trypsin digestion, but full-length CED-9 was not. These results suggest that the CED-3-cleaved form of CED-9 prevents apoptosis in mammalian cells by localizing to the inner mitochondrial membrane.

Prevention of Apoptosis of Mammalian Cells by the CED-3-Cleaved Form of CED-9.