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O6-methylguanine-DNA methyltransferase and human cancer chemotherapy
Y P Zhang1, D W Wang, Y N Chen
1Institute of Radiation Medicine, Academy of Military Medical Sciences, Beijing, PRC.
Abstract:
Two kinds of human tumor cell strains having different activity of O6-methylguanine-DNA methyltransferase (O6-MT) were transplanted into nude mice. Then the mice were injected intraperitoneally with bifunctional alkylating agent 1-(4-amino-2-methyl-5-pyrimidinyl) methyl-3-(2-chloroethyl)-3-nitrosourea hydrochloride (ACNU). The tumors with low O6-MT activity were quickly suppressed or cured. The result suggests that some tumors, if provisionally determined with low O6-MT activity, might be efficiently cured by treatment with ACNU. This probably opens a new way for human cancer chemotherapy.
Insights
Human tumors with low O6-methylguanine-DNA methyltransferase (O6-MT) activity were effectively treated with the alkylating agent ACNU. This finding suggests ACNU may be a promising chemotherapy for specific human cancers.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- O6-methylguanine-DNA methyltransferase (O6-MT) is a DNA repair enzyme.
- Alkylating agents like ACNU are used in cancer chemotherapy.
- Tumor cell O6-MT activity can influence treatment response.
Purpose of the Study:
- To investigate the efficacy of ACNU against human tumor xenografts with varying O6-MT activity in nude mice.
- To determine if O6-MT activity can predict ACNU treatment outcomes.
Main Methods:
- Transplantation of human tumor cell strains with differing O6-MT activity into nude mice.
- Intraperitoneal administration of the alkylating agent ACNU.
- Monitoring tumor suppression and cure rates.
Main Results:
- Tumors exhibiting low O6-MT activity showed rapid suppression or complete cure following ACNU treatment.
- Tumors with higher O6-MT activity likely responded less favorably (implied).
Conclusions:
- Provisional determination of low O6-MT activity in tumors may identify patients suitable for ACNU therapy.
- ACNU demonstrates potential as an effective chemotherapeutic agent for specific human cancers based on O6-MT levels.
- This research may pave the way for novel approaches in human cancer chemotherapy.