Abstract:
:Treatment of a human promyelocytic leukemia cell line (HL-60) with etoposide for 3-4 hrs produced an extensive degradation of DNA. Agarose gel electrophoresis showed DNA fragmentation in a nucleosomal ladder pattern. Simultaneous addition of zinc ion (ZnSO4, 1 mM) inhibited DNA fragmentation, although the amount of DNA strand breakage introduced initially by etoposide did not change significantly as measured by the DNA unwinding assay. Furthermore, zinc ion abrogated both the activation of poly(ADP-ribose) synthesis and the morphologic changes characteristic of apoptosis by etoposide. These results suggest that zinc ion inhibits a metabolic process somewhere between initial DNA cleavage through an interference with type II topoisomerase and delayed degradation of cellular DNA to a nucleosome-like pattern.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Shimizu T,Kubota M,Tanizawa A,Sano H,Kasai Y,Hashimoto H,Akiyama Y,Mikawa Hdoi
10.1016/0006-291x(90)92019-vsubject
Has Abstractpub_date
1990-06-29 00:00:00pages
1172-7issue
3eissn
0006-291Xissn
1090-2104pii
0006-291X(90)92019-Vjournal_volume
169pub_type
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