ISSN:
1573-7373
Keywords:
APEX nuclease
;
AP endonuclease
;
DNA 3′ repair diesterase
;
cellular sensitivity to genotoxic agents
;
glioma cells (human)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The multifunctional DNA repair enzyme (APEX nuclease) having apurinic/apyrimidinic (AP) endonuclease, 3′-5′ exonuclease, DNA 3′ repair diesterase and DNA 3′-phosphatase activities is thought to be involved in repair of AP sites and single-strand breaks with 3′-blocked termini. To investigate the biological role of the enzyme, we studied the correlation between APEX AP endonuclease activity in several human glioma cell lines having various degree of its expression and cellular susceptibility to cytotoxic agents such as methyl methanesulfonate (MMS), 1-(4-amino-2-methyl-5-pyrimidinyl)methyl-3-(2-chloroethyl)-3-nitrosourea hy-drochloride (ACNU), cis-diamminedichloroplatinum(II) (CDDP), etoposide (VP-16), hydrogen peroxide (H2O2), hyperthermia and X-ray. The cell lines having lower APEX expression showed higher sensitivity to MMS and H2O2 which are known to induce AP sites and single strand breaks on DNA, respectively. The cellular susceptibility to the other agents tested was not significantly correlated to the APEX expression. The present results are thought to support the notion that APEX nuclease plays an important role on repair of AP sites and single-strand DNA breaks with 3′-blocked termini in mammalian cells.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01053151
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