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Mol Cell Biol. 1992 July; 12(7): 3060-3069

Genome digestion is a dispensable consequence of physiological cell death mediated by cytotoxic T lymphocytes.

D S Ucker, P S Obermiller, W Eckhart, J R Apgar, N A Berger and J Meyers

Division of Immunology and Membrane Biology, Salk Institute, La Jolla, California 92037.

ABSTRACT

We examined virally transformed murine fibroblast clones as targets for cytotoxic T lymphocyte (CTL)-triggered lysis and genome digestion. Strikingly, while all clones were essentially equivalent in the ability to be lysed, one clone, SV3T3-B2.1, failed to exhibit genome digestion associated with CTL attack. Other aspects of the physiological cell death process, including loss of adhesion and nuclear envelope breakdown (lamin phosphorylation and solubilization), were not altered in this clone. The absence of genome digestion associated with CTL-induced cell death correlated with the absence of endodeoxyribonuclease activity in the nuclei of that clone. Characterization of the activity affected identifies a calcium-dependent, DNase I-like endonuclease of approximately 40 kDa, normally present constitutively in all cell nuclei, as the enzyme responsible for genome digestion associated with CTL-mediated cell death. These observations indicate that neither genome digestion per se nor its consequences [such as activation of poly(ADP-ribose) polymerase] are essential for cell death resulting from the triggering of this cell suicide process.

Mol Cell Biol. 1992 July; 12(7): 3060-3069




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