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A mutant strain of mouse FM3A cells was defective in apoptotic DNA fragmentation. Upon DNA damage by UV-radiation, the strain did not form DNA fragments, though it accumulated a large amount of p53 protein as did wild-type cells. No DNA fragmentation was observed when the strain was subjected to other kinds of DNA damaging agents such as X ray-radiation, or addition of etoposide to the culture medium. Other well-known biological stimulations inducing apoptosis, serum depletion or addition of TNF-alpha to the culture medium, also failed to cause DNA fragmentation in the cells. Using this apoptosis-deficient strain, we characterized another apoptotic reaction, export of phosphatidylserine to the cell surface. This molecule was exported onto the surface in both wild-type and the mutant cells when cells were treated with TNF-alpha and cycloheximide. Thus, the export of phosphatidylserine is suggested to be independent of the pathway for apoptotic DNA fragmentation.
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