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NADPH-dependent reductases and polyol formation in human leukemia cell lines
Sanai Sato1, E Filippo Secchi, Shinichi Sakurai
1Department of Medicine, College of Medicine, University of Oklahoma, PO Box 26901, BSEB 331, Oklahoma City, OK 73190-3048, USA. sanai-sato@ouhsc.edu
Chemico-Biological Interactions
|February 27, 2003
Summary
Leukemia cell lines possess the polyol pathway, with varying levels of aldose and aldehyde reductases. These enzymes influence sugar alcohol production, highlighting cell-specific metabolic differences.
Area of Science:
- Biochemistry
- Cell Biology
- Hematology
Background:
- Human leukemia cell lines serve as models for primary human leukocytes due to tissue scarcity.
- Understanding metabolic pathways in leukemia cells is crucial for targeted therapies.
Purpose of the Study:
- To investigate NADPH-dependent reductases and the polyol pathway in human leukemia cell lines.
- To compare enzyme levels and metabolic flux across different leukemia subtypes.
Main Methods:
- Enzyme quantification via chromatofocusing.
- Polyol pathway flux analysis using 19F-NMR with 3-fluoro-3-deoxy-D-glucose (3FG).
- Sugar alcohol profiling using gas chromatography.
Main Results:
- Myelocytic leukemia cells predominantly expressed aldehyde reductase, with low aldose reductase.
- Lymphocytic leukemia cells showed higher aldose reductase levels, particularly MOLT-4 and SKW6.4.
- All cell lines accumulated galactitol from D-galactose, correlating with aldose reductase activity.
- FK 366, an aldose reductase inhibitor, reduced galactitol formation.
- 19F-NMR confirmed polyol pathway activity, with significant variations in sorbitol and fructose levels.
Conclusions:
- The polyol pathway is active in both myelocytic and lymphocytic leukemia cell lines.
- Significant inter-cell line variability exists in enzyme levels and polyol pathway flux.
- These findings underscore metabolic heterogeneity in leukemia models.