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Apurinic/apyrimidinic endonuclease-1 protein level is associated with the cytotoxicity of L-configuration deoxycytidine analogs (troxacitabine and β-L-2′,3′-dideoxy-2′,3′-didehydro-5-fluorocytidine) but not D-configuration deoxycytidine analogs (gemcitabine and β-D-arabinofuranosylcytosine)
Lam W.; Park S.-Y.; Leung C.-H.; Cheng Y.-C.
2006-05-01
Source PublicationMolecular Pharmacology
ISSN0026895X 15210111
Volume69Issue:5Pages:1607-1614
Abstractβ-L-Dioxolane-cytidine (L-OddC, BCH-4556, Troxacitabine), a novel L-configuration deoxycytidine analog, is under phase III clinical trial for cancer treatment. We showed that human apurinic/apyrimidinic endonuclease (APE-1) has exonuclease activity for preferentially removing L-OddC and other L-configuration nucleosides over D-configuration nucleosides from the 3′ terminus of DNA in vitro. In this study, we examined whether APE-1 protein plays a role in the cytotoxicity of L-OddC. We established RKO (human colorectal carcinoma) cell lines that can be induced by doxycycline to overexpress 4- to 5-fold either APE-1 wild type (wt), C65A (redox deficient), E96A (exonuclease deficient), or E96Q (exonuclease deficient) mutants and to down-regulate endogenous APE-1 by short hairpin RNA to 10% of the original level. Clonogenic results indicated that the induction of wt or C65A, but not E96A or E96Q, made cells approximately 2-fold resistant to L-OddC and β-L-2′,3′- dideoxy-2′,3β-didehydro-5-fluorocytidine (L-Fd4C), whereas the down-regulation of APE-1 sensitized cells by approximately 2-fold to L-OddC and L-Fd4C. The alteration of APE-1 in cells did not change the sensitivity of these cells to β-D-2′,2′-difluorodeoxycytidine (dFdC; gemcitabine) and β-D-arabinofuranosylcytosine (AraC), both of which are D-configuration deoxycytidine analogs. The DNA incorporation of L-OddC, but not that of dFdC, was decreased by the induction of wt APE-1 but not E96A mutant and was increased by the down-regulation of APE-1. The rate of retention of L-OddC was inversely correlated to the level of APE-1 in isolated nuclei; however, this was not the case for dFdC. In conclusion, this study supports the hypothesis that APE-1 plays a critical role in the actions of L-configuration but not D-configuration nucleoside analogs. Copyright © 2006 The American Society for Pharmacology and Experimental Therapeutics.
DOI10.1124/mol.105.021527
URLView the original
Language英語
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Cited Times [WOS]:17   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
AffiliationYale University School of Medicine
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Lam W.,Park S.-Y.,Leung C.-H.,et al. Apurinic/apyrimidinic endonuclease-1 protein level is associated with the cytotoxicity of L-configuration deoxycytidine analogs (troxacitabine and β-L-2′,3′-dideoxy-2′,3′-didehydro-5-fluorocytidine) but not D-configuration deoxycytidine analogs (gemcitabine and β-D-arabinofuranosylcytosine)[J]. Molecular Pharmacology,2006,69(5):1607-1614.
APA Lam W.,Park S.-Y.,Leung C.-H.,&Cheng Y.-C..(2006).Apurinic/apyrimidinic endonuclease-1 protein level is associated with the cytotoxicity of L-configuration deoxycytidine analogs (troxacitabine and β-L-2′,3′-dideoxy-2′,3′-didehydro-5-fluorocytidine) but not D-configuration deoxycytidine analogs (gemcitabine and β-D-arabinofuranosylcytosine).Molecular Pharmacology,69(5),1607-1614.
MLA Lam W.,et al."Apurinic/apyrimidinic endonuclease-1 protein level is associated with the cytotoxicity of L-configuration deoxycytidine analogs (troxacitabine and β-L-2′,3′-dideoxy-2′,3′-didehydro-5-fluorocytidine) but not D-configuration deoxycytidine analogs (gemcitabine and β-D-arabinofuranosylcytosine)".Molecular Pharmacology 69.5(2006):1607-1614.
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