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The FASEB Journal, Vol 3, 1843-1849, Copyright © 1989 by The Federation of American Societies for Experimental Biology
RESEARCH COMMUNICATIONS |
DJ McConkey, P Hartzell, P Nicotera and S Orrenius
Department of Toxicology, Karolinska Institutet, Stockholm, Sweden.
Glucocorticoid hormones kill immature thymocytes by activating a self- destructive process that involves extensive DNA fragmentation. It has been demonstrated that thymocyte suicide is dependent on an early, sustained increase in cytosolic Ca2+ concentration, and new protein synthesis, but the biochemical lesion that leads to cell death has not been established. To determine whether endonuclease activation or activation of another Ca2+-dependent process could mediate cell killing, we treated thymocytes with the glucocorticoid methylprednisolone in the presence of inhibitors of various Ca2+- dependent degradative enzymes. The role of poly(ADP-ribose) polymerase, an enzyme known to be activated by DNA damage, was also assessed. Glucocorticoid-induced chromatin cleavage and cell killing were blocked by the endonuclease inhibitor aurintricarboxylic acid, whereas inhibitors of other Ca2+-dependent degradative processes or of poly(ADP- ribose) polymerase did not abrogate cell death. In addition, stimulation of thymocyte DNA fragmentation by the Ca2+ ionophore A23187 resulted in cell killing that could be blocked by the endonuclease inhibitor. Together, our results suggest that thymocyte suicide is caused by extensive Ca2+-stimulated DNA fragmentation.
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