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Genomic instability and tolerance to alkylating agents

P Karran¹, R Hampson

¹Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire.

Cancer Surveys

|January 1, 1996

Summary

DNA mismatch repair defects cause resistance to methylating chemotherapy agents. However, these defects make cancer cells sensitive to chloroethylating agents, offering new treatment strategies for microsatellite instability tumors.

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Area of Science:

Molecular Biology
Cancer Research
Genetics

Background:

Cytotoxic effects of methylating chemotherapy agents stem from unrepaired O6-methylguanine (O6-meGua) DNA adducts.
DNA mismatch repair (MMR) pathway attempts to process O6-meGua, and its deficiency is a common mechanism of resistance to methylating agents.

Purpose of the Study:

To investigate the role of DNA mismatch repair (MMR) in resistance to methylating agents.
To explore the potential of targeting MMR-deficient cells with specific chemotherapeutic agents.

Main Methods:

Utilized experimental models to study the cytotoxic effects of methylating agents.
Analyzed the mechanisms of DNA mismatch repair (MMR) in the context of chemotherapy resistance.

Main Results:

Loss of DNA mismatch repair (MMR) pathway function leads to resistance against methylating chemotherapeutic agents like temozolomide.
Cells deficient in MMR exhibit selective sensitivity to chloroethylating agents.

Conclusions:

MMR defects are implicated in clinical resistance to methylating agents.
Targeting MMR-deficient tumors, characterized by microsatellite instability, with chloroethylating agents presents a promising therapeutic strategy.

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