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Juvenile chronic myelocytic leukemia (JCML) in a child showed elevated red blood cell enzymes and metabolites, suggesting a young cell population. These findings support the theory that JCML involves a reversion to fetal erythropoiesis.
Area of Science:
- Hematology
- Pediatric Oncology
- Biochemistry
Background:
- Juvenile chronic myelocytic leukemia (JCML) is a rare hematologic malignancy in children.
- Understanding the underlying pathophysiology of JCML is crucial for diagnosis and treatment.
- Red blood cell (RBC) metabolism offers insights into erythropoiesis and disease states.
Observation:
- Evaluated RBC enzymes and metabolites (2,3-DPG, ATP) in a JCML patient at diagnosis and during disease progression.
- Assessed age-dependent enzymes (hexokinase, aldolase, pyruvate kinase, G6PD) and non-age-dependent enzymes (G3PD, phosphoglycerate kinase, enolase).
- Monitored enzyme activities and metabolite concentrations over a 6-month period.
Findings:
- Elevated activities of age-dependent RBC enzymes and increased concentrations of 2,3-DPG and ATP were observed.
- Non-age-dependent enzyme activities were also increased, similar to or exceeding levels in term infants.
- Progressive increase in RBC glyceraldehyde-3-phosphate dehydrogenase (G3PD) and marked increase in phosphoglucose isomerase activity were noted as the disease advanced.
Implications:
- The metabolic profile suggests a young RBC population with increased glycolytic rate in JCML.
- Findings support the hypothesis that JCML represents a reversion to fetal erythropoiesis.
- Further research into these metabolic alterations may reveal novel therapeutic targets for JCML.
Abstract:
Red cell enzymes, 2,3-diphosphoglycerate (2,3-DPG) and adenosine triphosphate (ATP), were evaluated in a 23-mo-old boy with juvenile chronic myelocytic leukemia (JCML) at the onset of his illness and 6 mo later during the accelerated phase. The activities of the age-dependent red cell enzymes, hexokinase, aldolase, pyruvate kinase, and glucose-6-phosphate dehydrogenase, were elevated, as were the concentrations of red cell 2,3-DPG and ATP, consistent with a young red cell population metabolizing at an increased glycolytic rate. The activities of the non-age-dependent enzymes, glyceraldehyde-3-phosphate dehydrogenase (G3PD), phosphoglycerate kinase, and enolase, were also increased to levels similar to or greater than those observed in term infants. As the illness progressed, the activity of red cell G3PD increased further, and phosphoglucose isomerase activity increased markedly. These results are consistent with the prior suggestion that JCML represents a reversion to "fetal" erythropoiesis.