Related Experiment Videos
2-fluoro-ATP: a toxic metabolite of 9-beta-D-arabinosyl-2-fluoroadenine
Abstract:
Murine P388 cells incubated in vitro with the anticancer drug arabinosyl 2-fluoroadenine accumulate its 5'-triphosphate, F-araATP, as the major phosphorylated metabolite. A new chromatographically separate metabolite that accumulated to levels 10% of that of F-araATP was identified as 2-fluoro-ATP, by the following criteria. 1. The metabolite coeluted with the authentic compound on anion-exchange HPLC. 2. Dephosphorylation of the metabolite yielded a compound that was chromatographically identical to 2-fluoroadenosine. 3. The compound was sensitive to NaIO4 oxidation. Cellular incubation experiments indicated that 2-fluoroadenine, but not arabinosyl 2-fluorohypoxanthine, was the likely intermediate in the formation of 2-fluoro-ATP.
Insights
Researchers identified 2-fluoro-ATP as a novel metabolite of the anticancer drug arabinosyl 2-fluoroadenine in murine cells. This finding advances understanding of drug metabolism and potential therapeutic efficacy.
Area of Science:
- Pharmacology
- Biochemistry
- Cancer Research
Background:
- Murine P388 cells are a common model for studying anticancer drug efficacy.
- Arabinosyl 2-fluoroadenine is an anticancer drug known to form phosphorylated metabolites.
- Understanding drug metabolism is crucial for optimizing cancer therapy.
Purpose of the Study:
- To identify and characterize novel phosphorylated metabolites of arabinosyl 2-fluoroadenine.
- To elucidate the metabolic pathway of arabinosyl 2-fluoroadenine in cancer cells.
- To investigate the formation of 2-fluoro-ATP from arabinosyl 2-fluoroadenine.
Main Methods:
- In vitro incubation of murine P388 cells with arabinosyl 2-fluoroadenine.
- High-performance liquid chromatography (HPLC) for metabolite separation and identification.
- Enzymatic dephosphorylation and chemical oxidation (NaIO4) for structural confirmation.
Main Results:
- The major phosphorylated metabolite was identified as arabinosyl 2-fluoroadenine 5'-triphosphate (F-araATP).
- A novel metabolite, 2-fluoro-ATP, was identified, accumulating at 10% of F-araATP levels.
- 2-fluoro-ATP was confirmed by coelution on HPLC, dephosphorylation to 2-fluoroadenosine, and sensitivity to NaIO4 oxidation.
- Cellular studies indicated 2-fluoroadenine as the precursor to 2-fluoro-ATP.
Conclusions:
- 2-fluoro-ATP is a significant, previously unidentified metabolite of arabinosyl 2-fluoroadenine.
- The metabolic pathway involves 2-fluoroadenine as an intermediate in 2-fluoro-ATP formation.
- This research provides insights into the metabolic fate of arabinosyl 2-fluoroadenine, relevant for drug development.