Abundance of BER-related proteins depends on cell proliferation status and the presence of DNA polymerase ß.
J Radiat Res
; 56(4): 607-14, 2015 Jul.
Article
em En
| MEDLINE
| ID: mdl-25829532
ABSTRACT
In mammalian cells, murine N-methylpurine DNA glycosylase (MPG) removes bases damaged spontaneously or by chemical agents through the process called base excision repair (BER). In this study, we investigated the influence of POL ß deficiency on MPG-initiated BER efficiency and the expression levels of BER-related proteins in log-phase and growth-arrested (G(0)) mouse embryonic fibroblasts (MEFs). G(0) wild-type (WT) or POL ß-deficient (Pol ß-KO) cells showed greater resistance to methyl methanesulfonate than did log-phase cells, and repair of methylated bases was less efficient in the G(0) cells. Apex1 mRNA expression was significantly lower in Pol ß-KO or G(0) WT MEFs than in log-phase WT MEFs. Moreover, although Mpg mRNA levels did not differ significantly among cell types, MPG protein levels were significantly higher in log-phase WT cells than in log-phase Pol ß-KO cells or either type of G(0) cells. Additionally, proliferating cell nuclear antigen protein levels were also reduced in log-phase Pol ß-KO cells or either type of G(0) cells. These results indicated that MPG-initiated BER functions mainly in proliferating cells, but less so in G(0) cells, and that POL ß may be involved in regulation of the amount of intracellular repair proteins.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ciclo Celular
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DNA Polimerase beta
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Proteínas de Ligação a DNA
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Reparo do DNA
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Fibroblastos
Limite:
Animals
Idioma:
En
Revista:
J Radiat Res
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Japão