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Related Experiment Videos

Elastase activity in leukemic cells.

E Törnebohm1, D Lockner, C Paul

  • 1Department of Internal Medicine, Huddinge University Hospital, Sweden.

Haemostasis
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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Elastase activity was detected in acute nonlymphoblastic leukemia cells, particularly in promyelocytic leukemia (M3), but not in acute lymphoblastic leukemia (ALL) cells. This suggests elastase may cause bleeding complications in M3 leukemia.

Area of Science:

  • Biochemistry
  • Hematology
  • Oncology

Background:

  • Elastase is a proteolytic enzyme found in monocytes, macrophages, and granulocytes.
  • Elastase digests various clotting factors, playing a role in coagulation.
  • Bleeding complications are common in certain types of leukemia, such as acute promyelocytic leukemia (M3).

Purpose of the Study:

  • To investigate the presence and activity of elastase in leukemic cells.
  • To determine if elastase activity correlates with specific leukemia subtypes, particularly acute lymphoblastic leukemia (ALL) and acute nonlymphoblastic leukemia (ANLL).
  • To explore the potential role of elastase in the bleeding complications observed in M3 leukemia.

Main Methods:

  • Leukemic cells were isolated from one patient with ALL and six patients with ANLL.

Related Experiment Videos

  • Elastase activity was measured in the isolated leukemic cells.
  • Activity levels were quantified relative to DNA content.

    • Main Results:

    • Detectable elastase activity was found in leukemic cells from all six ANLL patients.
    • Elastase activity in ANLL cells ranged from 0.016 to 0.619 mU/L/µg DNA.
    • The highest elastase activity was observed in a patient with promyelocytic leukemia (M3).
    • No elastase activity was detected in the leukemic cells from the ALL patient.

    Conclusions:

    • Elastase is present in acute nonlymphoblastic leukemia cells, with significantly higher levels in promyelocytic leukemia (M3).
    • The absence of elastase in acute lymphoblastic leukemia (ALL) cells differentiates these subtypes.
    • Elastase-mediated proteolysis of coagulation factors is a potential mechanism underlying the frequent bleeding complications in M3 leukemia.