Document Detail

Differential induction of etoposide-mediated apoptosis in human leukemia HL-60 and K562 cells.
MedLine Citation:
PMID:  7969039     Owner:  NLM     Status:  MEDLINE    
Etoposide (VP-16) is one of several DNA-damaging agents that induce subcellular structural changes associated with apoptosis. VP-16 exerts its DNA-damaging and cytotoxic effects subsequent to interference with DNA topoisomerase II activity. VP-16 also stimulates c-jun and c-fos mRNA expression in some cell lines, including human leukemia K562 and HL-60 cells. To compare the temporal relationship between drug-induced c-jun expression and apoptosis, we examined cell morphology, cell viability, DNA integrity, and c-jun induction during VP-16 treatment of K562 and HL-60 cells. VP-16 (10 microM)-induced internucleosomal DNA damage and nuclear fragmentation were readily apparent within 6 hr in HL-60 cells but were absent in K562 cells treated for up to 24 hr. Some internucleosomal DNA damage was observed in K562 cells but only after treatment with 100 microM VP-16 for 24 hr. In contrast, VP-16-induced DNA single-strand breaks, VP-16-induced topoisomerase II/DNA covalent complex formation, and VP-16-mediated growth inhibition were similar in K562 and HL-60 cells. Also, the time course of VP-16-induced c-jun mRNA expression was comparable for both K562 and HL-60 cell lines. Western blot analysis of whole-cell lysates showed that Bcl-2 protein levels were 13-fold greater in HL-60 cells than in K562 cells. Thus, the resistance of VP-16-treated K562 cells to apoptosis was not attributable to protection by Bcl-2. Furthermore, the relatively high levels of Bcl-2 in HL-60 cells were not sufficient to protect these cells against apoptosis. Together, our results indicate that the temporal coupling of VP-16-induced DNA damage, c-jun expression, and apoptosis is cell type specific and suggest that different signaling pathways for apoptosis are operating in these two human leukemia cell lines.
M K Ritke; J M Rusnak; J S Lazo; W P Allan; C Dive; S Heer; J C Yalowich
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular pharmacology     Volume:  46     ISSN:  0026-895X     ISO Abbreviation:  Mol. Pharmacol.     Publication Date:  1994 Oct 
Date Detail:
Created Date:  1994-12-06     Completed Date:  1994-12-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0035623     Medline TA:  Mol Pharmacol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  605-11     Citation Subset:  IM    
Department of Pharmacology, University of Pittsburgh School of Medicine, Pennsylvania 15261.
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MeSH Terms
Apoptosis / drug effects*,  genetics
Cell Nucleus / metabolism
DNA / drug effects
DNA Damage
Etoposide / pharmacology*
Flow Cytometry
Gene Expression Regulation / drug effects
Genes, fos
Genes, jun*
Proto-Oncogene Proteins / genetics
Proto-Oncogene Proteins c-bcl-2
Tumor Cells, Cultured
Reg. No./Substance:
0/Proto-Oncogene Proteins; 0/Proto-Oncogene Proteins c-bcl-2; 33419-42-0/Etoposide; 9007-49-2/DNA

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