Abstract
This review focuses on DNA repair as a mechanism of resistance to chemotherapeutic agents that attack at the O6 position of guanine. This class of agents includes the methylating agents, temozolomide, procarbazine, dacarbazine (DTIC), and steptozotocin, and the chloroethylating agents, carmustine (1,3 bis-chloroethyl 2-nitrosourea, BCNU), lomustine (3-cyclohexyl-1-chloroethyl-nitrosourea, CCNU), (2-chloroethyl)-3-sarcosinamide-1-nitrosourea (SarCNU), and agents used in other countries, including clomosome and 1-(4-amino-2-methyl-5-pyrimidinyl)methyl-3-(2-chlorethyl)-3-nitrosourea (ACNU). Both groups of agents attack at the same site, but their mechanism of cytotoxicity appears to differ. For instance, methylating agents form numerous methyl-DNA adducts, including O6-methylguanine (O6-mG). In cells with persistent O6-mG adducts, over 6,000 lesions are required to induce cell death [1]. In contrast, chloroethylating agents lead to the formation of DNA-interstrand crosslinks, only a few of which are required for cytotoxicity [2].
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References
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KoƧ, O.N. et al. (1996). Role of DNA Repair in Resistance to Drugs that Alkylate O6 of Guanine. In: Hait, W.N. (eds) Drug Resistance. Cancer Treatment and Research, vol 87. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1267-3_5
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DOI: https://doi.org/10.1007/978-1-4613-1267-3_5
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