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Human interleukin 3: effects on normal and leukemic cells.

K E Barber¹, P S Crosier, K J Purdie

¹Department of Immunobiology, School of Medicine, University of Auckland, New Zealand.

Growth Factors (Chur, Switzerland)

|January 1, 1989

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Recombinant human interleukin 3 (IL3) supports normal bone marrow cell growth, including mast cells, but does not affect human leukemia cell lines. Leukemia cells lack IL3 mRNA, suggesting autocrine secretion isn't a maintenance factor.

Area of Science:

Hematology
Cell Biology
Immunology

Background:

Interleukin 3 (IL3) is a key cytokine involved in hematopoiesis.
Understanding IL3's role in normal and malignant hematopoiesis is crucial for therapeutic development.

Purpose of the Study:

To investigate the effects of recombinant human IL3 on normal bone marrow cells and various human leukemic cell lines.
To determine if leukemic cells produce IL3, potentially contributing to their proliferation.

Main Methods:

Clonal assays were used to assess IL3's effect on bone marrow cell colony formation.
Replating experiments evaluated the sustained proliferative capacity of IL3-stimulated progenitor cells.
Flow cytometry and monoclonal antibody 3C5 were used for cell sorting.

Related Experiment Videos

Analysis of IL3 mRNA transcripts in leukemic cells using RT-PCR or similar techniques.

Main Results:

IL3 supported the growth of all normal bone marrow colony types, including megakaryocytes and mast cells.
Erythroid colony formation required both IL3 and erythropoietin.
IL3-induced proliferation of normal bone marrow cells was inhibited by tumor necrosis factor and lymphotoxin.
Human IL3 had no discernible effect on the growth, morphology, or clonogenicity of tested human leukemic cell lines (HL60, U-937, KG1a, HEL).
IL3 mRNA was not detected in these leukemic cell lines or K562 cells.
Cells from patients with myeloproliferative disorders, myelodysplastic syndromes, or acute myeloid leukemia showed proliferative responses to IL3, but lacked IL3 mRNA.

Conclusions:

Recombinant human IL3 is a potent stimulator of normal hematopoiesis.
Human leukemic cell lines do not appear to rely on autocrine IL3 production for maintenance.
The lack of IL3 mRNA in patient-derived leukemia cells suggests exogenous IL3 may influence these conditions, but autocrine production is not a factor.