The sensitization of cells treated with O6-methylguanine to alkylation damage is affected by the number of O6-methylguanine-DNA methyltransferase molecules escaped from inactivation

被引：9

作者：

Citti, L ^{[1
]}

Mariani, L ^{[1
]}

Capecchi, B ^{[1
]}

Piras, A ^{[1
]}

Leuzzi, R ^{[1
]}

Rainaldi, G ^{[1
]}

机构：

[1] CNR, Ist Mutagenesi & Differenziamento, Pisa, Italy

来源：

MUTATION RESEARCH-DNA REPAIR | 1998年 / 409卷 / 03期

关键词：

genotoxicity; mitozolomide; O-6-methylguanine-DNA methyltransferase; O-6-methylguanine;

D O I：

10.1016/S0921-8777(98)00054-8

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

O-6-Methylguanine (MeG) can bind to the active site of O-6-methylguanine-DNA methyltransferase (MGMT) as a free base. The subsequent methyl transfer reaction inactivates the repair protein. Hence, MeG is used to deplete the active MGMT pools in Chinese hamster cell lines (CHO) transfected to express varying amounts of human MGMT. After treatment with the free base, a residual population of active protein molecules remains localized mostly in the cytoplasm. Depleted cells are then challenged with the alkylating drug mitozolomide. Genotoxicity of this agent varied among the cell lines, and the compound sensitivity seemed to be regulated by a steady state equilibrium of residual MGMT molecules between nucleus and cytoplasm. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：173 / 179

页数：7

共 27 条

[1] O-6-METHYLGUANINE-DNA METHYLTRANSFERASE ACTIVITY AND INDUCTION OF NOVEL IMMUNOGENICITY IN MURINE TUMOR-CELLS TREATED WITH METHYLATING AGENTS [J].