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7-Hydroxymethotrexate formation in a human lymphoblastic cell line.
Biochemical and Biophysical Research Communications
|August 16, 1984
Summary
Methotrexate chemotherapy generates 7-hydroxymethotrexate, a less active metabolite. This conversion occurs within target cells, impacting acute lymphocytic leukemia treatment effectiveness.
Area of Science:
- Pharmacology
- Oncology
- Cell Biology
Background:
- Methotrexate is a key chemotherapy agent.
- 7-Hydroxymethotrexate is a known metabolite of methotrexate.
- Understanding metabolite formation is crucial for drug efficacy.
Purpose of the Study:
- To investigate the formation of 7-hydroxymethotrexate in lymphoblastic cell lines.
- To determine if target cells can convert methotrexate to its metabolite.
Main Methods:
- Incubation of CCRF-CEM human lymphoblastic cell line cultures.
- Treatment with 100 microM methotrexate.
Main Results:
- Significant quantities of 7-hydroxymethotrexate were formed in cell cultures.
- Demonstrates in vitro conversion of methotrexate by lymphoblastic cells.
Conclusions:
- Methotrexate conversion to 7-hydroxymethotrexate occurs within target cells, not just the liver.
- This intracellular conversion impacts the therapeutic efficacy of methotrexate in treating acute lymphocytic leukemia.