| Toxicity of camptothecin to Chinese hamster cells containing 5-hydroxymethyl-2'-deoxyuridine in their DNA. | |
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MedLine Citation:
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PMID: 7739616 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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5-Hydroxymethyl-2'-deoxyuridine (hmdUrd) is incorporated into the DNA of V79 Chinese hamster cells as an analogue of thymidine. Incorporated residues are then recognized and excised by hmUra-DNA glycosylase (hmUDG). The removal of large numbers of hmUra residues and subsequent strand breakage is cytotoxic, as has been demonstrated by our finding that a mutant cell line, which is deficient in this enzyme, is resistant to hmdUrd (Boorstein et al., 1992a). In order to determine whether topoisomerase I plays a role in hmUDG initiated base excision repair, V79 cells and repair deficient V79mut1 cells were exposed to combinations of hmdUrd and the topoisomerase I inhibitors camptothecin (CPT), CPT-11, and beta-lapachone. Treatment of V79 cells with hmdUrd followed by non-toxic concentrations of camptothecin or CPT-11 showed significant enhancement of the baseline cytotoxicity of the hmdUrd alone. In contrast, camptothecin and CPT-11 had no effect in combination with hmdUrd in the V79mut1 cells. Non-toxic concentrations of beta-lapachone, which inhibits topoisomerase I by a different mechanism than camptothecin and CPT-11, produced no synergistic toxicity in V79 cells. Neither camptothecin nor CPT-11 inhibited removal of hmdUrd from hmdUrd treated cells, nor did they affect hmdUrd-induced poly(ADP-ribose) synthesis. Camptothecin did not alter the cell cycle distribution of either hmdUrd treated cells or untreated cells at concentrations sufficient to cause synergistic toxicity with hmdUrd. Results from our study indicate that the utility of topoisomerase I inhibitors may be enhanced by sensitizing cells with hmdUrd initiated repair activity which arrests cells in S-phase and produces DNA lesions that are further converted into lethal damage by camptothecin. |
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Authors:
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L J Mi; L N Chiu; E Mahl; R J Boorstein |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Mutation research Volume: 336 ISSN: 0027-5107 ISO Abbreviation: Mutat. Res. Publication Date: 1995 May |
Date Detail:
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Created Date: 1995-06-08 Completed Date: 1995-06-08 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0400763 Medline TA: Mutat Res Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 293-305 Citation Subset: IM |
Affiliation:
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Department of Pathology, New York University Medical Center, NY, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Antibiotics, Antineoplastic / toxicity Antineoplastic Agents / pharmacology* Camptothecin / analogs & derivatives, toxicity* Cell Cycle / drug effects Cell Line / drug effects Cricetinae Cricetulus DNA Repair / drug effects, physiology* DNA Topoisomerases, Type I / antagonists & inhibitors* Dose-Response Relationship, Drug Drug Synergism Lung / cytology Naphthoquinones / toxicity Poly(ADP-ribose) Polymerases / antagonists & inhibitors, biosynthesis S Phase Thymidine / analogs & derivatives*, metabolism, toxicity |
| Grant Support | |
ID/Acronym/Agency:
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CA16087/CA/NCI NIH HHS; CA49689/CA/NCI NIH HHS; CA51060/CA/NCI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Antibiotics, Antineoplastic; 0/Antineoplastic Agents; 0/Naphthoquinones; 100286-90-6/irinotecan; 4707-32-8/beta-lapachone; 50-89-5/Thymidine; 5116-24-5/5-hydroxymethyl-2'-deoxyuridine; 7689-03-4/Camptothecin; EC 2.4.2.30/Poly(ADP-ribose) Polymerases; EC 5.99.1.2/DNA Topoisomerases, Type I |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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