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• W1966947892 abstract "The DNA repair protein O6-methylguanine-DNA methyltransferase (MGMT) has been implicated in resistance of human brain tumors to alkylating agents. We observed that 14 human medulloblastoma- and gliomaderived cell lines differ in sensitivity to the methylating agent N-methyl-N′-nitro-N-nitrosoguanidine (MNNG), as shown by their 28-fold range in 10% survival dose (LD10). By using the substrate analogue inhibitor O6-benzylguanine (O6-BG), we showed that the contribution of MGMT to resistance varies widely, as evidenced by 3- to 30-fold reductions in LD10 among the lines, and varies up to 20-fold among subpopulations of individual lines. Importantly, variability in resistance, manifested as a 20-fold range in LD10, persists after measurable MGMT is eliminated, disclosing differential contributions of other resistance mechanisms to survival. Cells exposed to MNNG while suspended in growth medium are more resistant than cells alkylated as subconfluent monolayers, and MGMT accounts for a smaller proportion of their resistance. Notably, the MGMT content of the lines is not statistically correlated with MNNG resistance or with potentiation of killing by O6-BG, even though MGMT is a biochemically demonstrated determinant of resistance. In contrast, the same lines vary less in resistance to the ethylating agent N-ethylnitrosourea (ENU), and MGMT makes only a small contribution to resistance. Our results strongly indicate that resistance to both MNNG and ENU is multifactorial. © 1995 Wiley-Liss, Inc." @default.
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• W1966947892 date "1995-06-01" @default.
• W1966947892 modified "2023-10-11" @default.
• W1966947892 title "Contribution ofO6-methylguanine-DNA methyltransferase to monofunctional alkylating-agent resistance in human brain tumor—derived cell lines" @default.
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• W1966947892 doi "https://doi.org/10.1002/mc.2940130203" @default.
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