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Erythrocyte enzyme abnormalities in leukemias.

Subhadra Sharma1, H P Pati

  • 1Department of Laboratory Medicine (Haematology), All India Institute of Medical Sciences, New Delhi.

The Journal of the Association of Physicians of India
|August 17, 2006
PubMed
Summary

Red blood cell enzyme activity, including pyruvate kinase (PK) and hexokinase (HK), is altered in leukemia patients, particularly during relapse. These changes normalize during remission, suggesting a link to abnormal stem cells.

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Area of Science:

  • Hematology
  • Biochemistry
  • Oncology

Background:

  • Red blood cell (RBC) enzyme activity can be indicative of underlying metabolic and disease states.
  • Leukemia, a cancer of blood-forming tissues, involves abnormal white blood cell proliferation.
  • Understanding enzyme alterations in leukemia may provide insights into disease mechanisms.

Purpose of the Study:

  • To investigate alterations in red blood cell enzyme activities in various subtypes of leukemia.
  • To determine if these enzyme changes correlate with disease status (relapse vs. remission).
  • To explore the potential link between red cell enzyme abnormalities and leukemia stem cells.

Main Methods:

  • Assay of red blood cell enzymes, including pyruvate kinase (PK), hexokinase (HK), and glucose-6-phosphate dehydrogenase (G6PD).
  • Analysis of enzyme activities in 67 patients with acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), and chronic myeloid leukemia (CML).
  • Comparison of enzyme levels between patients in relapse and remission phases.

Main Results:

  • Significantly high PK activity observed in chronic myeloid leukemia (CML) and blastic CML.
  • Elevated HK activity found across all leukemia subtypes.
  • No significant alterations in G6PD activity; no PK deficiency in AML or G6PD deficiency in ALL.
  • Positive correlations between G6PD, PK, and HK activities in CML and AML, but not in acute leukemia.
  • Enzyme alterations were primarily observed during relapse and normalized during remission.

Conclusions:

  • Red blood cell enzyme alterations in leukemia patients are associated with disease relapse.
  • These abnormalities may stem from abnormal pluripotent stem cells giving rise to leukemia cells.
  • Normalization of enzyme activities during remission suggests a recovery of normal stem cell function.

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