| Monochloramine inhibits etoposide-induced apoptosis with an increase in DNA aberration. | |
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MedLine Citation:
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PMID: 11295536 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Monochloramine (NH(2)Cl) is a physiological oxidant produced by activated neutrophils, and it affects apoptosis signaling. We studied the effects of NH(2)Cl on the cell death induced by etoposide, a widely used anticancer agent that is directed to DNA topoisomerase II. Jurkat T cells, a human acute T cell leukemia cell line, were pretreated with 70 microM of NH(2)Cl for 10 min. After 24 h, 5-30 microM of etoposide was added to the NH(2)Cl pretreated and control cells, and their apoptosis, caspase activity, cell morphology, and cellular DNA contents were measured. NH(2)Cl pretreatment significantly inhibited apoptosis and caspase activation induced by etoposide or camptothecin, a DNA topoisomerase I poison, but not by staurosporine or Fas stimulation. The apoptosis inhibition actually resulted in the proliferation of the survived cells and, notably, the survived cells showed more aberrant morphology, such as variation in nuclear size, nuclear fragments, and multinucleated cells. DNA content analysis of the survived cells showed an increase in aneuploid nuclei. Cell cycle analysis after 24 h of NH(2)Cl treatment showed a significant decrease in S phase cells with a concurrent increase in G(0)/G(1) phase cells, which suggested that NH(2)Cl induced G(1) arrest. Using synchronized Jurkat cells, etoposide and camptothecin were found to be particularly cytotoxic to S phase cells, whereas staurosporine and Fas stimulation were not. Thus NH(2)Cl-induced G(1) arrest was a likely cause of the observed resistance to etoposide. These observations suggested that inflammation-derived oxidants may make the tumor cells more resistant to etoposide and increase the risk of tumor progression and the development of secondary tumors by increasing the survival of DNA damage-bearing cells. |
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Authors:
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T A Than; T Ogino; M Omori; S Okada |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Free radical biology & medicine Volume: 30 ISSN: 0891-5849 ISO Abbreviation: Free Radic. Biol. Med. Publication Date: 2001 Apr |
Date Detail:
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Created Date: 2001-04-11 Completed Date: 2001-08-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8709159 Medline TA: Free Radic Biol Med Country: United States |
Other Details:
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Languages: eng Pagination: 932-40 Citation Subset: IM |
Affiliation:
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Department of Pathology, Okayama University Medical School, Faculty of Medicine, Okayama, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aneuploidy Antibodies, Monoclonal / pharmacology Antineoplastic Agents, Phytogenic / antagonists & inhibitors, pharmacology Apoptosis / drug effects* Camptothecin / antagonists & inhibitors, pharmacology Caspases / metabolism Cell Cycle / drug effects Cell Division / drug effects Cell Size / drug effects Cell Survival / drug effects Chloramines / pharmacology* DNA / analysis DNA Damage / drug effects*, genetics Enzyme Activation / drug effects Etoposide / antagonists & inhibitors*, pharmacology Humans Jurkat Cells Oxidants / pharmacology* Staurosporine / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Antibodies, Monoclonal; 0/Antineoplastic Agents, Phytogenic; 0/Chloramines; 0/Oxidants; 0/anti-Fas monoclonal antibody; 10599-90-3/chloramine; 33419-42-0/Etoposide; 62996-74-1/Staurosporine; 7689-03-4/Camptothecin; 9007-49-2/DNA; EC 3.4.22.-/Caspases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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