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Excretion of polyamines by children with leukemia during chemotherapy
Insights
Urinary polyamine levels, specifically acetylputrescine and acetylspermidine, change during cancer treatment. Elevated acetylspermidine excretion may indicate a positive response to chemotherapy in children with leukemia.
Area of Science:
- Biochemistry
- Oncology
- Molecular Biology
Background:
- Polyamines are crucial for cell growth and function.
- Aberrant polyamine metabolism is linked to various cancers, including leukemia.
- Tansfer RNA (tRNA) methylation is influenced by polyamine concentrations.
Purpose of the Study:
- To investigate the relationship between polyamine excretion and tRNA methylation in vitro and in vivo.
- To analyze changes in urinary polyamine levels in children with acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML) before and after chemotherapy.
- To explore the potential of polyamine excretion as a biomarker for predicting chemotherapy response.
Main Methods:
- In vitro and in vivo studies examining polyamine concentration and tRNA methylation.
- Monitoring urinary polyamine levels (acetylputrescine, acetylspermidine) in pediatric leukemia patients.
- Correlating polyamine excretion patterns with leukocyte counts and treatment outcomes.
Main Results:
- Urinary polyamine excretion was slightly elevated in children with ALL and AML prior to chemotherapy.
- A significant increase in acetylputrescine excretion was observed for 30-60 days post-chemotherapy initiation.
- Acetylspermidine excretion increased 3-4 days after starting chemotherapy, correlating positively with leukocyte counts.
Conclusions:
- Polyamine metabolism is altered during chemotherapy for pediatric leukemia.
- Post-chemotherapy increases in acetylputrescine may result from tumor cell destruction and cellular recovery.
- The ratio of acetylspermidine excretion can serve as a potential indicator of therapeutic response in leukemia patients.
Abstract:
Evidence is presented showing a relation between polyamine concentration and the methylation of tRNA in vitro and in vivo. Polyamine excretion in urine of children with ALL and AML is slightly elevated before the commencement of chemotherapy. Immediately thereafter, excretion of acetylputrescine increases drastically over a period of at least 30-60 days. The elevation seems to be caused by different factors, e.g., destruction of tumor cells, induction of ornithindecarboxylase, and cell recovery after termination of chemotherapy. Acetylspermidine excretion also increases 3-4 days after the beginning of chemotherapy. A positive correlation exists between leukocyte counts and excretion of acetylspermidine. The ratio of acetylspermidine excretion at days 3-4 of the therapy to that before commencement of chemotherapy could be an indicator of response to the therapy.