Effects of Ape1 overexpression on cellular resistance to DNA-damaging and anticancer agents.
Effects of Ape1 overexpression on cellular resistance to DNA-damaging and anticancer agents.
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Ape1 过度表达对细胞对 DNA 损伤和抗癌药物耐药性的影响。
DOI:
10.1023/a:1019979613989
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发表时间:
1999
期刊:
影响因子:
--
通讯作者:
Wilson3rd,DM
中科院分区:
文献类型:
--
作者:
Schild,LJ;Brookman,KW;Thompson,LH;Wilson3rd,DM
In vitro biochemical studies indicate that Ape1 is the major mammalian enzyme responsible for repairing abasic lesions in DNA and a significant factor in the processing of specific 3′-replication-blocking termini. Toward addressing the role of Ape1 in cellular resistance to specific DNA-damaging and anticancer agents, we constructed a chinese hamster ovary (CHO) cell line, AA8-Ape1, that exhibits a 7-fold higher Ape1-dependent nuclease activity; this overexpression is abolished upon exposure to tetracycline (Tc). In comparison to the AA8 parental control, our data indicates that Ape1 activity is not rate-limiting for the repair of cytotoxic damages induced by the alkylating agent methyl methanesulfonate (MMS), the oxidizing agent hydrogen peroxide (H2O2), or ionizing radiation (IR). AA8-Ape1 cells did exhibit increased resistance to bleomycin following a chronic 3-day exposure, but not to more acute challenges of 1 h. Most notably, the AA8-Ape1 line displayed ∼1.7-fold elevated resistance to the replication-blocking nucleoside analog dioxolane cytidine (L-OddC); this improved resistance was abrogated by the addition of Tc to the medium. These studies demonstrate that Ape1 is not rate-limiting in the repair of MMS- or H2O2-induced DNA damage, that Ape1 may dictate the sensitivity of bleomycin, depending on dosing scheme, and for the first time, that Ape1 can influence cellular resistance to the anticancer/antiviral antimetabolite L-OddC.
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影响因子:
4.7
作者:
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通讯作者:
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影响因子:
7.3
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Á. Pazos
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7.3
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Jung,YW;VanDort,ME;Gildersleeve,DL;Wieland,DM
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Wieland,DM
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7.3
作者:
Rogers,GA;Parsons,SM;Anderson,DC;Nilsson,LM;Bahr,BA;Kornreich,WD;Kaufman,R;Jacobs,RS;Kirtman,B
通讯作者:
Kirtman,B