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J. Biol. Chem., Vol. 277, Issue 14, 12001-12008, April 5, 2002
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From the § Department of Medicine and
Chromatin structure is influenced by
histone modification, and this may help direct chromatin behavior to
facilitate transcription, DNA replication, and DNA repair. Chromatin
condensation and DNA fragmentation are the classic nuclear features but
remain poorly characterized. It is highly probable that nucleosomal
structure must be altered to allow these features to become apparent,
but data to support this construct are lacking. We report here that in
response to apoptotic signals from a death receptor (CD95 and tumor
necrosis factor-
Department of Surgery, McMaster University, and
Father Sean O'Sullivan Research Institute, St. Joseph's
Hospital, Hamilton, Ontario L8N 1Y2, Canada and the ¶ Department
of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis,
Tennessee 38105
) or mitochondrial (staurosporine) apoptotic stimulus, the core nucleosomal histones H2A, H2B, H3, and H4 become separated from DNA during apoptosis in Jurkat and HeLa cells and are
consequently detectable in the cell lysate prepared using a non-ionic
detergent. The timing of this histone release from DNA correlates well
with the progression of apoptosis. We also show expression of a
caspase cleavage-resistant form of ICAD (ICAD-DM) in Jurkat and HeLa
cells abolished DNA fragmentation and also dramatically reduced histone
release in apoptotic cells. However, we demonstrate that apoptotic
histone release is not an inevitable consequence of CAD/DFF-40-mediated
DNA destruction as DNA fragmentation but not histone release occurs
efficiently in tumor necrosis factor-
- and etoposide-treated NIH3T3
cells. Furthermore, in an in vitro apoptotic assay,
incubation of apoptotic Jurkat cellular extract with non-apoptotic
Jurkat nuclei led to nuclear DNA fragmentation without obvious histone
release. Taken together, these data demonstrate that CAD/DFF-40
functions indirectly in mediating nucleosomal destruction during apoptosis.
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